changed bin name to fluxo

Reviewed-on: #2

.gitea/workflows/ci.yml

@@ -0,0 +1,62 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check:
+    name: Lint and Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+          components: rustfmt, clippy
+          cache: false
+      - name: Install packaging tools
+        run: apt-get update && apt-get install -y dpkg-dev pkg-config libdbus-1-dev protobuf-compiler libpulse-dev
+
+      - name: Check formatting
+        run: cargo fmt --check
+
+      - name: Clippy
+        run: cargo clippy --tests -- -D warnings
+
+      - name: Test
+        run: cargo test
+
+      - name: Build
+        run: cargo build --release
+
+  version-check:
+    name: Version Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Compare versions
+        shell: bash
+        run: |
+          NEW_VERSION=$(grep -m1 '^version =' Cargo.toml | cut -d '"' -f 2)
+
+          git fetch origin ${{ github.base_ref }}
+          OLD_VERSION=$(git show origin/${{ github.base_ref }}:Cargo.toml | grep -m1 '^version =' | cut -d '"' -f 2)
+
+          echo "Old version (main): $OLD_VERSION"
+          echo "New version (PR): $NEW_VERSION"
+
+          if [ "$NEW_VERSION" = "$OLD_VERSION" ]; then
+            echo "Error: Cargo.toml version has not been updated in this PR!"
+            exit 1
+          else
+            echo "Success: Version updated from $OLD_VERSION to $NEW_VERSION"
+          fi

.gitea/workflows/release.yml

@@ -0,0 +1,109 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    name: Build and Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+          cache: false
+
+      - name: Install packaging tools
+        run: apt-get update && apt-get install -y dpkg-dev pkg-config libdbus-1-dev protobuf-compiler libpulse-dev
+
+      - name: Get Version
+        id: get_version
+        run: |
+          VERSION=$(grep -m1 '^version =' Cargo.toml | cut -d '"' -f 2)
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
+          if [[ "${{ github.ref }}" == refs/tags/v* ]]; then
+            echo "TAG=${{ github.ref_name }}" >> $GITHUB_OUTPUT
+          else
+            echo "TAG=v$VERSION" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Check if Release Exists
+        id: check_release
+        shell: bash
+        run: |
+          HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            "${{ github.server_url }}/api/v1/repos/${{ github.repository }}/releases/tags/${{ steps.get_version.outputs.TAG }}")
+
+          if [ "$HTTP_STATUS" = "200" ]; then
+            echo "EXISTS=true" >> $GITHUB_OUTPUT
+            echo "Release already exists for tag ${{ steps.get_version.outputs.TAG }}. Skipping."
+          else
+            echo "EXISTS=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Build
+        if: steps.check_release.outputs.EXISTS == 'false'
+        run: cargo build --release
+
+      - name: Test
+        if: steps.check_release.outputs.EXISTS == 'false'
+        run: cargo test
+
+      - name: Package .deb
+        if: steps.check_release.outputs.EXISTS == 'false'
+        env:
+          VERSION: ${{ steps.get_version.outputs.VERSION }}
+          TAG: ${{ steps.get_version.outputs.TAG }}
+        run: |
+          PKG="fluxo_${VERSION}_amd64"
+
+          mkdir -p "${PKG}/DEBIAN"
+          mkdir -p "${PKG}/usr/bin"
+
+          cp target/release/fluxo "${PKG}/usr/bin/"
+          strip "${PKG}/usr/bin/fluxo"
+
+          printf '%s\n' \
+            "Package: fluxo" \
+            "Version: ${VERSION}" \
+            "Section: utils" \
+            "Priority: optional" \
+            "Architecture: amd64" \
+            "Maintainer: fluxo contributors" \
+            "Description: High-performance daemon/client for Waybar custom modules" \
+            " fluxo is a compiled Rust daemon that polls system metrics and" \
+            " serves formatted JSON output to Waybar custom modules over a Unix" \
+            " domain socket. Replaces shell scripts with a single binary." \
+            > "${PKG}/DEBIAN/control"
+
+          dpkg-deb --build "${PKG}"
+
+          mv "${PKG}.deb" "fluxo-${TAG}-amd64.deb"
+          echo "Built: fluxo-${TAG}-amd64.deb"
+
+      - name: Create Release and Upload Assets
+        if: steps.check_release.outputs.EXISTS == 'false'
+        uses: https://github.com/softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ steps.get_version.outputs.TAG }}
+          name: Release ${{ steps.get_version.outputs.TAG }}
+          body: |
+            Automated release for version ${{ steps.get_version.outputs.VERSION }}
+            Commit: ${{ github.sha }}
+            Branch: ${{ github.ref_name }}
+          files: |
+            fluxo-${{ steps.get_version.outputs.TAG }}-amd64.deb
+            target/release/fluxo
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Cargo.toml

@@ -1,16 +1,44 @@
 [package]
 name = "fluxo-rs"
-version = "0.2.0"
+version = "0.5.3"
 edition = "2024"
 
+[[bin]]
+name = "fluxo"
+path = "src/main.rs"
+
+[features]
+default = ["mod-audio", "mod-bt", "mod-network", "mod-hardware", "mod-dbus"]
+mod-audio = ["dep:libpulse-binding"]
+mod-bt = ["dep:bluer", "dep:maestro"]
+mod-network = ["dep:nix"]
+mod-hardware = []
+mod-dbus = ["dep:zbus", "dep:futures"]
+
 [dependencies]
 anyhow = "1.0.102"
 clap = { version = "4.6.0", features = ["derive"] }
 ctrlc = "3"
-regex = "1.10"
+libc = "0.2"
+regex = "1.12"
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
 sysinfo = "0.38.4"
-toml = "1.0.6"
+thiserror = "2.0"
+toml = "1.1.2"
 tracing = "0.1.44"
 tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
+tokio = { version = "1", features = ["rt", "rt-multi-thread", "sync", "time", "macros", "signal", "process", "io-util", "net"] }
+tokio-util = { version = "0.7", features = ["codec", "time"] }
+notify = "8.2.0"
+
+# Optional module dependencies
+maestro = { git = "https://github.com/qzed/pbpctrl", package = "maestro", optional = true }
+bluer = { version = "0.17", features = ["bluetoothd", "rfcomm", "id"], optional = true }
+futures = { version = "0.3", optional = true }
+libpulse-binding = { version = "2.30", optional = true }
+nix = { version = "0.31", features = ["net"], optional = true }
+zbus = { version = "5", optional = true }
+
+[dev-dependencies]
+tempfile = "3"

README.md

@@ -1,96 +1,74 @@
-# fluxo-rs
+# fluxo
 
-fluxo-rs is a high-performance system metrics daemon and client designed specifically for waybar. It replaces standard shell scripts with a compiled rust binary that collects data via a background polling loop and serves it over a unix domain socket (`/tmp/fluxo.sock`).
+`fluxo` is a high-performance system metrics daemon and client designed specifically for Waybar. It entirely replaces standard shell scripts with a compiled Rust binary that collects data via a background polling loop and serves it over a Unix socket. 
 
-## Description
+With its **100% Native, Content-Based Event-Driven Architecture**, it consumes effectively 0% CPU while idle and signals Waybar to redraw *only* when the rendered UI text or icons physically change.
 
-The project follows a client-server architecture:
+## Key Features
-- **Daemon**: Handles heavy lifting (polling cpu, memory, network, gpu) and stores state in memory.
-- **Client**: A thin cli wrapper that connects to the daemon's socket to retrieve formatted json for waybar.
 
-This approach eliminates process spawning overhead and temporary file locking, resulting in near-zero cpu usage for custom modules.
+- **100% Native Architecture**: Zero shell-outs or subprocesses. Uses `bluer` for Bluetooth, `libpulse-binding` for audio, `zbus` for MPRIS/DND, and `notify` for backlight.
-
+- **Content-Based Event Signaling**: `fluxo` evaluates your custom configuration formats internally. It only sends a `SIGRTMIN+X` signal to Waybar if the resulting string or CSS class has actually changed, eliminating pointless re-renders from raw polling fluctuations.
-## Features
+- **Zero-Latency Interactions**: Direct library bindings mean that when you change your volume or connect a Bluetooth device via the CLI, the daemon updates instantly.
-
+- **Circuit Breaker (Failsafe)**: Automatically detects failing modules and enters a "Cool down" state, preventing resource waste and log spam. Fallback caching keeps your bar looking clean even during brief failures.
-- **Ultra-lightweight**: Background polling is highly optimized (e.g., O(1) process counting).
+- **Multi-threaded Polling**: Decoupled Tokio subsystem threads ensure that a hang in one system (e.g., a slow GPU probe) never freezes your Waybar.
-- **Jitter-free**: Uses zero-width sentinels and figure spaces to prevent waybar from trimming padding.
-- **Configurable**: Fully customizable output formats via toml config.
-- **Interactive Menus**: Integrated support for selecting items (like Bluetooth devices) via external menus (e.g., Rofi, Wofi, Fuzzel).
-- **Live Reload**: Configuration can be reloaded without restarting the daemon.
-- **Multi-vendor GPU**: Native support for intel (igpu), amd, and nvidia.
 
 ## Modules
 
 | Command | Description | Tokens |
 | :--- | :--- | :--- |
-| `net` | Network speed (rx/tx) | `{interface}`, `{ip}`, `{rx}`, `{tx}` |
+| `cpu` | CPU usage and temperature | `{usage}`, `{temp}`, `{model}` |
-| `cpu` | CPU usage and temp | `{usage}`, `{temp}` |
 | `mem` | Memory usage | `{used}`, `{total}` |
-| `gpu` | GPU utilization | `{usage}`, `{vram_used}`, `{vram_total}`, `{temp}` |
+| `net` | Network status & speeds | `{interface}`, `{ip}`, `{rx}`, `{tx}` |
-| `sys` | System load and uptime | `{uptime}`, `{load1}`, `{load5}`, `{load15}` |
+| `sys` | System load and uptime | `{uptime}`, `{load1}`, `{load5}`, `{load15}`, `{procs}` |
-| `disk` | Disk usage (default: /) | `{mount}`, `{used}`, `{total}` |
+| `disk` | Disk usage | `{mount}`, `{used}`, `{total}` |
-| `pool` | Aggregate storage (btrfs) | `{used}`, `{total}` |
+| `pool` | Btrfs aggregate storage | `{used}`, `{total}` |
-| `vol` | Audio output volume | `{name}`, `{volume}`, `{icon}` |
+| `gpu` | GPU usage & thermals | `{usage}`, `{vram_used}`, `{vram_total}`, `{temp}` |
-| `mic` | Audio input volume | `{name}`, `{volume}`, `{icon}` |
+| `vol` | Audio output (sink) | `{name}`, `{volume}`, `{icon}` |
-| `bt` | Bluetooth status | `{alias}` |
+| `mic` | Audio input (source) | `{name}`, `{volume}`, `{icon}` |
-| `buds` | Pixel Buds Pro control | `{left}`, `{right}`, `{anc}` |
+| `bt` | Bluetooth status & plugins | `{alias}`, `{mac}`, `{left}`, `{right}`, `{anc}` |
 | `power` | Battery and AC status | `{percentage}`, `{icon}` |
-| `game` | Hyprland gamemode status | active/inactive icon strings |
+| `game` | Hyprland Gamemode status | active/inactive strings |
+| `mpris` | Media Player status | `{artist}`, `{title}`, `{album}`, `{status_icon}` |
+| `backlight` | Display Brightness | `{percentage}`, `{icon}` |
+| `kbd` | Keyboard Layout | `{layout}` |
+| `dnd` | Do Not Disturb (SwayNC) | active/inactive strings |
 
 ## Setup
 
-1. Build the project:
+1. **Build**: `cargo build --release`
-   ```bash
+2. **Configure**: Create `~/.config/fluxo/config.toml` (see `example.config.toml`). Ensure you map your `[signals]`.
-   cd fluxo-rs
+3. **Daemon**: Start `fluxo daemon`. It is highly recommended to run this as a systemd user service.
-   cargo build --release
-   ```
 
-2. Start the daemon:
+## Waybar Configuration
-   ```bash
-   # Starts the daemon using the default config path (~/.config/fluxo/config.toml)
-   ./target/release/fluxo-rs daemon &
 
-   # Or provide a custom path
+To achieve zero-latency updates and zero-polling CPU usage, set `interval: 0` on your modules and rely entirely on **Waybar Signals** mapped in your `config.toml`:
-   ./target/release/fluxo-rs daemon --config /path/to/your/config.toml &
-   ```
 
-3. Configuration:
+```jsonc
-   Create `~/.config/fluxo/config.toml` (see `example.config.toml` for all default options).
+"custom/volume": {
-
+    "exec": "fluxo vol",
-4. Waybar configuration (`config.jsonc`):
+    "return-type": "json",
-   ```json
+    "interval": 0,
-   "custom/cpu": {
+    "signal": 8, // Must match the value in config.toml [signals]
-       "exec": "~/path/to/fluxo-rs cpu",
+    "on-click": "fluxo vol mute",
-       "return-type": "json"
+    "on-scroll-up": "fluxo vol up 1",
+    "on-scroll-down": "fluxo vol down 1",
+    "on-click-right": "fluxo vol cycle"
+},
+"custom/bluetooth-audio": {
+    "format": "{}",
+    "return-type": "json",
+    "exec": "fluxo bt",
+    "on-click": "fluxo bt menu",
+    "on-click-right": "fluxo bt cycle_mode",
+    "signal": 9,
+    "interval": 0,
+    "tooltip": true
 }
 ```
 
-## Development
+## Debugging
 
-### Architecture
+Start the daemon with `RUST_LOG=debug` to see detailed logs of library interactions and circuit breaker status:
-- `src/main.rs`: Entry point, CLI parsing, interactive GUI spawns (menus), and client-side formatting logic.
-- `src/daemon.rs`: UDS listener, configuration management, and polling orchestration.
-- `src/ipc.rs`: Unix domain socket communication logic.
-- `src/utils.rs`: Generic GUI utilities (like the menu spawner).
-- `src/modules/`: Individual metric implementations.
-- `src/state.rs`: Shared thread-safe data structures.
-
-### Adding a Module
-1. Add the required config block to `src/config.rs`.
-2. Add the required state fields to `src/state.rs`.
-3. Implement the `WaybarModule` trait in a new file in `src/modules/`.
-4. Add polling logic to `src/modules/hardware.rs` or `src/daemon.rs`.
-5. Register the new subcommand in `src/main.rs` and the router in `src/daemon.rs`.
-
-### Configuration Reload
-The daemon can reload its configuration live:
 ```bash
-fluxo-rs reload
+RUST_LOG=debug fluxo daemon
 ```
-
-### Logging & Debugging
-`fluxo-rs` uses the `tracing` ecosystem. If a module isn't behaving properly or your configuration isn't applying, start the daemon with debug logging enabled in the foreground:
-```bash
-RUST_LOG=debug fluxo-rs daemon
-```
-This will print verbose information regarding config parsing errors, subprocess failures, and IPC requests.

example.config.toml

@@ -0,0 +1,116 @@
+# Fluxo configuration example
+# Place this at ~/.config/fluxo/config.toml
+
+# Note: All tokens support standard alignment, padding, and precision specifiers dynamically.
+# For example, you can change {rx:>5.2} to {rx:<8.1} or {used} to {used:^4.0} directly here.
+
+[general]
+# command used for interactive menus (e.g., bluetooth device selection)
+# $FLUXO_PROMPT is securely injected to prevent shell escaping issues
+menu_command = "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\""
+# For Wofi use: menu_command = "wofi --show dmenu --prompt \"$FLUXO_PROMPT\""
+
+# Map modules to specific Waybar signals for zero-latency, event-driven UI updates.
+# These MUST match the `signal` configuration in your waybar config.jsonc
+[signals]
+network = 1
+cpu = 2
+memory = 3
+gpu = 4
+sys = 5
+disk = 6
+game = 7
+audio = 8
+bt = 9
+power = 10
+keyboard = 11
+mpris = 12
+backlight = 13
+dnd = 14
+
+[network]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {interface}, {ip}, {rx}, {tx}
+format = "{interface} ({ip}):  {rx:^4.1} MB/s   {tx:^4.1} MB/s"
+
+[cpu]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {usage}, {temp}, {model}
+format = "CPU: {usage:^4.1}% {temp:^4.1}C"
+
+[memory]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {used}, {total}
+format = "MEM: {used:^4.1}/{total:^4.1}GB"
+
+[gpu]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {usage}, {vram_used}, {vram_total}, {temp}
+format_amd = "AMD: {usage:>3.0}% {vram_used:>4.1}/{vram_total:>4.1}GB {temp:>4.1}C"
+format_intel = "iGPU: {usage:>3.0}%"
+format_nvidia = "NV: {usage:>3.0}% {vram_used:>4.1}/{vram_total:>4.1}GB {temp:>4.1}C"
+
+[sys]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {uptime}, {load1}, {load5}, {load15}, {procs}
+format = "UP: {uptime} LOAD: {load1:^3.1} "
+
+[disk]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {mount}, {used}, {total}
+format = "{mount} {used:^3.0}/{total:^3.0}G"
+
+[pool]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {used}, {total}
+format = "{used:>4.0}G / {total:>4.0}G"
+
+[power]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {percentage}, {icon}
+format = "{percentage:>3}%  {icon}"
+
+[audio]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {name}, {volume}, {icon}
+format_sink_unmuted = "{name} {volume:>3}% {icon}"
+format_sink_muted = "{name} {icon}"
+format_source_unmuted = "{name} {volume:>3}% {icon}"
+format_source_muted = "{name} {icon}"
+
+[bt]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {alias}, {mac}, {left}, {right}, {anc}
+format_plugin = "{alias} [{left}|{right}] {anc} 󰂰"
+format_connected = "󰂰 {alias}"
+format_disconnected = "󰂯 Disconnected"
+format_disabled = "󰂲 Off"
+
+[game]
+# enabled = false  # set to false to disable this module at runtime
+format_active = "<span size='large'>󰊖</span>"
+format_inactive = "<span size='large'></span>"
+
+[mpris]
+# enabled = false  # set to false to disable this module at runtime
+# max_length = 30          # truncate text beyond this character length (adds '...')
+# scroll = true            # enable marquee scroll animation (requires max_length)
+# scroll_speed = 500       # ms between scroll steps (only while playing)
+# scroll_separator = " /// "  # separator shown between loops when scrolling
+# tokens: {artist}, {title}, {album}, {status_icon}
+format = "{status_icon} {artist} - {title}"
+
+[backlight]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {percentage}, {icon}
+format = "{percentage:>3}% {icon}"
+
+[keyboard]
+# enabled = false  # set to false to disable this module at runtime
+# tokens: {layout}
+format = "{layout}"
+
+[dnd]
+# enabled = false  # set to false to disable this module at runtime
+format_dnd = "<span size='large'>󰂛</span>"
+format_normal = "<span size='large'>󰂚</span>"

src/bt_menu.rs

@@ -0,0 +1,135 @@
+//! Bluetooth interactive menu (client-side).
+//!
+//! Runs entirely in the client process because it needs to spawn the user's
+//! menu command (rofi/dmenu/wofi) — the daemon has no business opening GUI
+//! windows. Communicates with the daemon via IPC to fetch device lists and
+//! dispatch connect/disconnect/mode commands.
+
+/// Format strings used both when *building* menu items and when *parsing*
+/// the user's selection back. Keeping them together prevents drift.
+mod fmt {
+    /// Connected device with a plugin mode: `"<alias>: Mode: <mode> [<mac>]"`.
+    pub const MODE_INFIX: &str = ": Mode: ";
+    /// Disconnect action: `"Disconnect <alias> [<mac>]"`.
+    pub const DISCONNECT_PREFIX: &str = "Disconnect ";
+    /// Visual separator before paired-but-not-connected devices.
+    pub const CONNECT_HEADER: &str = "--- Connect Device ---";
+}
+
+/// Extract a MAC address enclosed in `[…]` at the end of a string.
+fn parse_mac_from_brackets(s: &str) -> Option<&str> {
+    let start = s.rfind('[')?;
+    let end = s.rfind(']')?;
+    if end > start + 1 {
+        Some(&s[start + 1..end])
+    } else {
+        None
+    }
+}
+
+/// Extract a MAC address enclosed in `(…)` at the end of a string.
+fn parse_mac_from_parens(s: &str) -> Option<&str> {
+    let start = s.rfind('(')?;
+    let end = s.rfind(')')?;
+    if end > start + 1 {
+        Some(&s[start + 1..end])
+    } else {
+        None
+    }
+}
+
+/// Parse a mode selection line: `"<alias>: Mode: <mode> [<mac>]"`.
+/// Returns `(mode, mac)`.
+fn parse_mode_selection(s: &str) -> Option<(&str, &str)> {
+    let mac = parse_mac_from_brackets(s)?;
+    let mode_start = s.find(fmt::MODE_INFIX)?;
+    let mode_begin = mode_start + fmt::MODE_INFIX.len();
+    let bracket_start = s.rfind('[')?;
+    if bracket_start > mode_begin {
+        let mode = s[mode_begin..bracket_start].trim_end();
+        Some((mode, mac))
+    } else {
+        None
+    }
+}
+
+/// Run the interactive Bluetooth device menu.
+///
+/// Fetches connected/paired devices from the daemon, presents them in the
+/// user's configured menu command, and dispatches the selected action back
+/// to the daemon.
+pub fn run_bt_menu() {
+    let config = crate::config::load_config(None);
+    let mut items = Vec::new();
+
+    let mut connected: Vec<(String, String)> = Vec::new();
+    let mut paired: Vec<(String, String)> = Vec::new();
+
+    // Fetch the device list from the daemon.
+    if let Ok(json_str) = crate::ipc::request_data("bt", &["menu_data"])
+        && let Ok(val) = serde_json::from_str::<serde_json::Value>(&json_str)
+        && let Some(text) = val.get("text").and_then(|t| t.as_str())
+    {
+        for line in text.lines() {
+            if let Some(rest) = line.strip_prefix("CONNECTED:")
+                && let Some((alias, mac)) = rest.split_once('|')
+            {
+                connected.push((alias.to_string(), mac.to_string()));
+            } else if let Some(rest) = line.strip_prefix("PAIRED:")
+                && let Some((alias, mac)) = rest.split_once('|')
+            {
+                paired.push((alias.to_string(), mac.to_string()));
+            }
+        }
+    }
+
+    // Build menu items for connected devices (modes + disconnect).
+    for (alias, mac) in &connected {
+        if let Ok(json_str) = crate::ipc::request_data("bt", &["get_modes", mac])
+            && let Ok(val) = serde_json::from_str::<serde_json::Value>(&json_str)
+            && let Some(modes_str) = val.get("text").and_then(|t| t.as_str())
+            && !modes_str.is_empty()
+        {
+            for mode in modes_str.lines() {
+                items.push(format!("{}{}{} [{}]", alias, fmt::MODE_INFIX, mode, mac));
+            }
+        }
+        items.push(format!("{}{} [{}]", fmt::DISCONNECT_PREFIX, alias, mac));
+    }
+
+    // Paired-but-not-connected devices go below a separator.
+    if !paired.is_empty() {
+        items.push(fmt::CONNECT_HEADER.to_string());
+        for (alias, mac) in &paired {
+            items.push(format!("{} ({})", alias, mac));
+        }
+    }
+
+    if items.is_empty() {
+        tracing::info!("No Bluetooth options found.");
+        return;
+    }
+
+    let Ok(selected) = crate::utils::show_menu("BT Menu: ", &items, &config.general.menu_command)
+    else {
+        return;
+    };
+
+    if let Some((mode, mac)) = parse_mode_selection(&selected) {
+        crate::output::print_waybar_response(crate::ipc::request_data(
+            "bt",
+            &["set_mode", mode, mac],
+        ));
+    } else if selected.starts_with(fmt::DISCONNECT_PREFIX) {
+        if let Some(mac) = parse_mac_from_brackets(&selected) {
+            crate::output::print_waybar_response(crate::ipc::request_data(
+                "bt",
+                &["disconnect", mac],
+            ));
+        }
+    } else if selected == fmt::CONNECT_HEADER {
+        // Section header — no action.
+    } else if let Some(mac) = parse_mac_from_parens(&selected) {
+        crate::output::print_waybar_response(crate::ipc::request_data("bt", &["connect", mac]));
+    }
+}

src/client.rs

@@ -0,0 +1,44 @@
+//! Client-side module command dispatch.
+//!
+//! Resolves CLI aliases (e.g. `mic` → audio source), delegates to
+//! special-case handlers (BT menu), and falls through to the standard
+//! IPC → daemon → Waybar JSON path for everything else.
+
+/// Resolve client-side module aliases that prepend implicit arguments.
+///
+/// `vol` maps to the audio sink, `mic` maps to the audio source — both
+/// dispatch to the `"vol"` module on the daemon with a `"sink"` or
+/// `"source"` prefix argument.
+fn resolve_alias(module: &str, args: &[String]) -> (String, Vec<String>) {
+    match module {
+        "vol" => {
+            let mut a = vec!["sink".to_string()];
+            a.extend(args.iter().cloned());
+            ("vol".to_string(), a)
+        }
+        "mic" => {
+            let mut a = vec!["source".to_string()];
+            a.extend(args.iter().cloned());
+            ("vol".to_string(), a)
+        }
+        _ => (module.to_string(), args.to_vec()),
+    }
+}
+
+/// Entry point for all `fluxo <module> [args...]` invocations.
+///
+/// Handles the BT menu special case client-side, resolves aliases, and
+/// sends the request to the daemon via IPC.
+pub fn run_module_command(module: &str, args: &[String]) {
+    // Bluetooth menu runs client-side because it spawns the user's menu
+    // command (rofi/dmenu/wofi) — the daemon must not open GUI windows.
+    #[cfg(feature = "mod-bt")]
+    if module == "bt" && args.first().map(|s| s.as_str()) == Some("menu") {
+        crate::bt_menu::run_bt_menu();
+        return;
+    }
+
+    let (actual_module, actual_args) = resolve_alias(module, args);
+    let args_ref: Vec<&str> = actual_args.iter().map(|s| s.as_str()).collect();
+    crate::output::print_waybar_response(crate::ipc::request_data(&actual_module, &args_ref));
+}

src/config.rs

@@ -1,92 +1,163 @@
+//! Configuration loading + top-level `Config` struct.
+//!
+//! Every module section `#[derive(Deserialize)]`s its own struct with `serde`
+//! defaults, so missing TOML sections/fields simply fall back to baked-in
+//! values. The live `Config` is held behind an `Arc<RwLock<_>>` by the daemon
+//! and replaced atomically on reload (see [`crate::daemon::reload_config`]).
+
 use serde::Deserialize;
 use std::fs;
 use std::path::PathBuf;
 use tracing::{debug, info, warn};
 
-#[derive(Deserialize, Default)]
+/// Top-level parsed `config.toml`. Each field corresponds to a `[section]`.
+#[derive(Deserialize, Default, Clone)]
 pub struct Config {
     #[serde(default)]
     pub general: GeneralConfig,
     #[serde(default)]
+    pub signals: SignalsConfig,
+    #[cfg(feature = "mod-network")]
+    #[serde(default)]
     pub network: NetworkConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub cpu: CpuConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub memory: MemoryConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub gpu: GpuConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub sys: SysConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub disk: DiskConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub pool: PoolConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub power: PowerConfig,
-    #[serde(default)]
+    #[cfg(feature = "mod-audio")]
-    pub buds: BudsConfig,
     #[serde(default)]
     pub audio: AudioConfig,
+    #[cfg(feature = "mod-bt")]
     #[serde(default)]
     pub bt: BtConfig,
+    #[cfg(feature = "mod-hardware")]
     #[serde(default)]
     pub game: GameConfig,
+    #[cfg(feature = "mod-dbus")]
+    #[serde(default)]
+    pub mpris: MprisConfig,
+    #[cfg(feature = "mod-dbus")]
+    #[serde(default)]
+    pub backlight: BacklightConfig,
+    #[cfg(feature = "mod-dbus")]
+    #[serde(default)]
+    pub keyboard: KeyboardConfig,
+    #[cfg(feature = "mod-dbus")]
+    #[serde(default)]
+    pub dnd: DndConfig,
 }
 
-#[derive(Deserialize)]
+/// Process-wide settings that aren't tied to a single module.
+#[derive(Deserialize, Clone)]
 pub struct GeneralConfig {
+    /// Shell command spawned by [`crate::utils::show_menu`] for interactive pickers.
     pub menu_command: String,
 }
 
 impl Default for GeneralConfig {
     fn default() -> Self {
         Self {
-            menu_command: "fuzzel --dmenu --prompt '{prompt}'".to_string(),
+            menu_command: "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\"".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Which Waybar `SIGRTMIN+N` signal each module should trigger, if any.
+///
+/// `None` disables signalling for that module entirely.
+#[allow(dead_code)]
+#[derive(Deserialize, Default, Clone)]
+pub struct SignalsConfig {
+    pub network: Option<i32>,
+    pub cpu: Option<i32>,
+    pub memory: Option<i32>,
+    pub gpu: Option<i32>,
+    pub sys: Option<i32>,
+    pub disk: Option<i32>,
+    pub pool: Option<i32>,
+    pub power: Option<i32>,
+    pub audio: Option<i32>,
+    pub bt: Option<i32>,
+    pub game: Option<i32>,
+    pub mpris: Option<i32>,
+    pub backlight: Option<i32>,
+    pub keyboard: Option<i32>,
+    pub dnd: Option<i32>,
+}
+
+/// Network module config. `format` tokens: `interface`, `ip`, `rx`, `tx`.
+#[derive(Deserialize, Clone)]
 pub struct NetworkConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for NetworkConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "{interface} ({ip}):  {rx:>5.2} MB/s   {tx:>5.2} MB/s".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// CPU module config. `format` tokens: `usage`, `temp`.
+#[derive(Deserialize, Clone)]
 pub struct CpuConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for CpuConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "CPU: {usage:>4.1}% {temp:>4.1}C".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Memory module config. `format` tokens: `used`, `total` (gigabytes).
+#[derive(Deserialize, Clone)]
 pub struct MemoryConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for MemoryConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "{used:>5.2}/{total:>5.2}GB".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// GPU module config with per-vendor format strings.
+#[derive(Deserialize, Clone)]
 pub struct GpuConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format_amd: String,
     pub format_intel: String,
     pub format_nvidia: String,
@@ -95,6 +166,7 @@ pub struct GpuConfig {
 impl Default for GpuConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format_amd: "AMD: {usage:>3.0}% {vram_used:>4.1}/{vram_total:>4.1}GB {temp:>4.1}C"
                 .to_string(),
             format_intel: "iGPU: {usage:>3.0}%".to_string(),
@@ -104,77 +176,79 @@ impl Default for GpuConfig {
     }
 }
 
-#[derive(Deserialize)]
+/// Sys module config. `format` tokens: `uptime`, `load1`, `load5`, `load15`, `procs`.
+#[derive(Deserialize, Clone)]
 pub struct SysConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for SysConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "UP: {uptime} | LOAD: {load1:>4.2} {load5:>4.2} {load15:>4.2}".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Disk module config. `format` tokens: `mount`, `used`, `total`.
+#[derive(Deserialize, Clone)]
 pub struct DiskConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for DiskConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "{mount} {used:>5.1}/{total:>5.1}G".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Btrfs pool module config. `format` tokens: `used`, `total`.
+#[derive(Deserialize, Clone)]
 pub struct PoolConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for PoolConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "{used:>4.0}G / {total:>4.0}G".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Battery/power module config. `format` tokens: `percentage`, `icon`.
+#[derive(Deserialize, Clone)]
 pub struct PowerConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format: String,
 }
 
 impl Default for PowerConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format: "{percentage:>3}%  {icon}".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Audio module config, one format per (sink|source) × (muted|unmuted) state.
-pub struct BudsConfig {
+#[derive(Deserialize, Clone)]
-    pub mac: String,
-    pub format: String,
-    pub format_disconnected: String,
-}
-
-impl Default for BudsConfig {
-    fn default() -> Self {
-        Self {
-            mac: "B4:23:A2:09:D3:53".to_string(),
-            format: "{left} | {right} | {anc}".to_string(),
-            format_disconnected: "<span size='large'></span>".to_string(),
-        }
-    }
-}
-
-#[derive(Deserialize)]
 pub struct AudioConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format_sink_unmuted: String,
     pub format_sink_muted: String,
     pub format_source_unmuted: String,
@@ -184,6 +258,7 @@ pub struct AudioConfig {
 impl Default for AudioConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format_sink_unmuted: "{name} {volume:>3}% {icon}".to_string(),
             format_sink_muted: "{name} {icon}".to_string(),
             format_source_unmuted: "{name} {volume:>3}% {icon}".to_string(),
@@ -192,9 +267,14 @@ impl Default for AudioConfig {
     }
 }
 
-#[derive(Deserialize)]
+/// Bluetooth module config. Plugin line tokens: `alias`, `left`, `right`,
+/// `anc`, `mac`. Plain connect line tokens: `alias`.
+#[derive(Deserialize, Clone)]
 pub struct BtConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format_connected: String,
+    pub format_plugin: String,
     pub format_disconnected: String,
     pub format_disabled: String,
 }
@@ -202,15 +282,20 @@ pub struct BtConfig {
 impl Default for BtConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format_connected: "{alias} 󰂰".to_string(),
+            format_plugin: "{alias} [{left}|{right}] {anc} 󰂰".to_string(),
             format_disconnected: "󰂯".to_string(),
             format_disabled: "󰂲 Off".to_string(),
         }
     }
 }
 
-#[derive(Deserialize)]
+/// Gamemode indicator config (active/inactive glyphs).
+#[derive(Deserialize, Clone)]
 pub struct GameConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
     pub format_active: String,
     pub format_inactive: String,
 }
@@ -218,14 +303,234 @@ pub struct GameConfig {
 impl Default for GameConfig {
     fn default() -> Self {
         Self {
+            enabled: true,
             format_active: "<span size='large'>󰊖</span>".to_string(),
             format_inactive: "<span size='large'></span>".to_string(),
         }
     }
 }
 
-pub fn load_config(custom_path: Option<PathBuf>) -> Config {
+/// MPRIS module config. `format` tokens: `artist`, `title`, `album`,
-    let config_path = custom_path.unwrap_or_else(|| {
+/// `status_icon`. Optional marquee scrolling when `scroll = true`.
+#[derive(Deserialize, Clone)]
+pub struct MprisConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    pub format: String,
+    #[serde(default)]
+    pub max_length: Option<usize>,
+    #[serde(default)]
+    pub scroll: bool,
+    #[serde(default = "default_scroll_speed")]
+    pub scroll_speed: u64,
+    #[serde(default = "default_scroll_separator")]
+    pub scroll_separator: String,
+}
+
+fn default_scroll_speed() -> u64 {
+    500
+}
+
+fn default_scroll_separator() -> String {
+    " /// ".to_string()
+}
+
+impl Default for MprisConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            format: "{status_icon} {artist} - {title}".to_string(),
+            max_length: None,
+            scroll: false,
+            scroll_speed: 500,
+            scroll_separator: " /// ".to_string(),
+        }
+    }
+}
+
+/// Backlight module config. `format` tokens: `percentage`, `icon`.
+#[derive(Deserialize, Clone)]
+pub struct BacklightConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    pub format: String,
+}
+
+impl Default for BacklightConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            format: "{percentage:>3}% {icon}".to_string(),
+        }
+    }
+}
+
+/// Keyboard layout module config. `format` tokens: `layout`.
+#[derive(Deserialize, Clone)]
+pub struct KeyboardConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    pub format: String,
+}
+
+impl Default for KeyboardConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            format: "{layout}".to_string(),
+        }
+    }
+}
+
+/// Do-Not-Disturb indicator config (dnd/normal glyphs).
+#[derive(Deserialize, Clone)]
+pub struct DndConfig {
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    pub format_dnd: String,
+    pub format_normal: String,
+}
+
+fn default_true() -> bool {
+    true
+}
+
+impl Default for DndConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            format_dnd: "<span size='large'>󰂛</span>".to_string(),
+            format_normal: "<span size='large'>󰂚</span>".to_string(),
+        }
+    }
+}
+
+fn extract_tokens(format_str: &str) -> Vec<String> {
+    crate::utils::TOKEN_RE
+        .captures_iter(format_str)
+        .map(|cap| cap[1].to_string())
+        .collect()
+}
+
+fn validate_format(label: &str, format_str: &str, known_tokens: &[&str]) {
+    for token in extract_tokens(format_str) {
+        if !known_tokens.contains(&token.as_str()) {
+            warn!(
+                "Config [{}]: unknown token '{{{}}}' in format string. Known tokens: {:?}",
+                label, token, known_tokens
+            );
+        }
+    }
+}
+
+impl Config {
+    /// Check if a module is enabled in the configuration.
+    /// Returns false if the module is explicitly disabled; true if enabled or unknown.
+    pub fn is_module_enabled(&self, module_name: &str) -> bool {
+        macro_rules! gen_enabled_match {
+            ($( { $feature:literal, $field:ident, $state:ty, [$($name:literal),+], [$($sig_name:literal),+], $module:path, $signal:ident, [$($default_arg:literal),*], $config:ident } )*) => {
+                match module_name {
+                    $(
+                        #[cfg(feature = $feature)]
+                        $($name)|+ => self.$config.enabled,
+                    )*
+                    // Dispatch-only modules (no watch channel)
+                    #[cfg(feature = "mod-audio")]
+                    "mic" => self.audio.enabled,
+                    #[cfg(feature = "mod-hardware")]
+                    "pool" | "btrfs" => self.pool.enabled,
+                    #[cfg(feature = "mod-hardware")]
+                    "power" => self.power.enabled,
+                    #[cfg(feature = "mod-hardware")]
+                    "game" => self.game.enabled,
+                    _ => true,
+                }
+            };
+        }
+        for_each_watched_module!(gen_enabled_match)
+    }
+
+    /// Warn-log any `{token}` placeholders used in format strings that the
+    /// corresponding module does not know how to fill in.
+    pub fn validate(&self) {
+        #[cfg(feature = "mod-network")]
+        validate_format(
+            "network",
+            &self.network.format,
+            &["interface", "ip", "rx", "tx"],
+        );
+        #[cfg(feature = "mod-hardware")]
+        {
+            validate_format("cpu", &self.cpu.format, &["usage", "temp"]);
+            validate_format("memory", &self.memory.format, &["used", "total"]);
+            validate_format(
+                "gpu.amd",
+                &self.gpu.format_amd,
+                &["usage", "vram_used", "vram_total", "temp"],
+            );
+            validate_format("gpu.intel", &self.gpu.format_intel, &["usage", "freq"]);
+            validate_format(
+                "gpu.nvidia",
+                &self.gpu.format_nvidia,
+                &["usage", "vram_used", "vram_total", "temp"],
+            );
+            validate_format(
+                "sys",
+                &self.sys.format,
+                &["uptime", "load1", "load5", "load15", "procs"],
+            );
+            validate_format("disk", &self.disk.format, &["mount", "used", "total"]);
+            validate_format("pool", &self.pool.format, &["used", "total"]);
+            validate_format("power", &self.power.format, &["percentage", "icon"]);
+        }
+        #[cfg(feature = "mod-audio")]
+        {
+            validate_format(
+                "audio.sink_unmuted",
+                &self.audio.format_sink_unmuted,
+                &["name", "icon", "volume"],
+            );
+            validate_format(
+                "audio.sink_muted",
+                &self.audio.format_sink_muted,
+                &["name", "icon"],
+            );
+            validate_format(
+                "audio.source_unmuted",
+                &self.audio.format_source_unmuted,
+                &["name", "icon", "volume"],
+            );
+            validate_format(
+                "audio.source_muted",
+                &self.audio.format_source_muted,
+                &["name", "icon"],
+            );
+        }
+        #[cfg(feature = "mod-bt")]
+        {
+            validate_format("bt.connected", &self.bt.format_connected, &["alias"]);
+            validate_format(
+                "bt.plugin",
+                &self.bt.format_plugin,
+                &["alias", "left", "right", "anc", "mac"],
+            );
+        }
+        #[cfg(feature = "mod-dbus")]
+        {
+            validate_format(
+                "mpris",
+                &self.mpris.format,
+                &["artist", "title", "album", "status_icon"],
+            );
+            validate_format("backlight", &self.backlight.format, &["percentage", "icon"]);
+            validate_format("keyboard", &self.keyboard.format, &["layout"]);
+        }
+    }
+}
+
+/// Resolve the default config path: `$XDG_CONFIG_HOME/fluxo/config.toml`
+/// (or `~/.config/fluxo/config.toml`).
+pub fn default_config_path() -> PathBuf {
     let config_dir = std::env::var("XDG_CONFIG_HOME")
         .map(PathBuf::from)
         .unwrap_or_else(|_| {
@@ -233,12 +538,18 @@ pub fn load_config(custom_path: Option<PathBuf>) -> Config {
             PathBuf::from(home).join(".config")
         });
     config_dir.join("fluxo/config.toml")
-    });
+}
+
+/// Load and validate the config, falling back to [`Config::default`] when
+/// the file is missing or malformed. Never panics.
+pub fn load_config(custom_path: Option<PathBuf>) -> Config {
+    let config_path = custom_path.unwrap_or_else(default_config_path);
 
     if let Ok(content) = fs::read_to_string(&config_path) {
-        match toml::from_str(&content) {
+        match toml::from_str::<Config>(&content) {
             Ok(cfg) => {
                 info!("Successfully loaded configuration from {:?}", config_path);
+                cfg.validate();
                 cfg
             }
             Err(e) => {
@@ -255,3 +566,72 @@ pub fn load_config(custom_path: Option<PathBuf>) -> Config {
         Config::default()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io::Write;
+
+    #[test]
+    fn test_default_config() {
+        let config = Config::default();
+        assert_eq!(
+            config.general.menu_command,
+            "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\""
+        );
+        assert!(config.cpu.format.contains("usage"));
+        assert!(config.cpu.format.contains("temp"));
+        assert!(config.memory.format.contains("used"));
+        assert!(config.memory.format.contains("total"));
+    }
+
+    #[test]
+    fn test_load_missing_config() {
+        let config = load_config(Some(PathBuf::from("/nonexistent/config.toml")));
+        // Should fallback to defaults without panicking
+        assert_eq!(
+            config.general.menu_command,
+            "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\""
+        );
+    }
+
+    #[test]
+    fn test_load_valid_partial_config() {
+        let mut tmpfile = tempfile::NamedTempFile::new().unwrap();
+        // In TOML, braces have no special meaning in strings
+        writeln!(tmpfile, "[cpu]").unwrap();
+        writeln!(tmpfile, "format = \"custom: {{usage}}\"").unwrap();
+
+        let config = load_config(Some(tmpfile.path().to_path_buf()));
+        // TOML treats {{ as literal {{ (no escape), so the value is "custom: {{usage}}"
+        assert!(config.cpu.format.contains("usage"));
+        // Other sections still have defaults
+        assert!(config.memory.format.contains("used"));
+    }
+
+    #[test]
+    fn test_load_invalid_toml() {
+        let mut tmpfile = tempfile::NamedTempFile::new().unwrap();
+        write!(tmpfile, "this is not valid toml {{{{").unwrap();
+
+        let config = load_config(Some(tmpfile.path().to_path_buf()));
+        // Should fallback to defaults
+        assert_eq!(
+            config.general.menu_command,
+            "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\""
+        );
+    }
+
+    #[test]
+    fn test_load_empty_config() {
+        let tmpfile = tempfile::NamedTempFile::new().unwrap();
+        // Empty file is valid TOML, all sections default
+
+        let config = load_config(Some(tmpfile.path().to_path_buf()));
+        assert_eq!(
+            config.general.menu_command,
+            "fuzzel --dmenu --prompt \"$FLUXO_PROMPT\""
+        );
+        assert!(config.cpu.format.contains("usage"));
+    }
+}

src/daemon.rs

@@ -1,20 +1,118 @@
+//! Daemon entry point: orchestrates polling tasks, signal handling, config
+//! hot-reloading, and the IPC server.
+//!
+//! Layout of [`run_daemon`]:
+//!
+//! 1. **Channels** — `watch::channel()` pairs for every module that pushes
+//!    state from a background task.
+//! 2. **Polling / event tasks** — one per module; each writes into its sender,
+//!    the signaler and request handlers read from the matching receiver.
+//! 3. **Config watchers** — filesystem notifier + `SIGHUP` handler refresh the
+//!    [`Config`] in place so modules see updates immediately.
+//! 4. **Signaler** — watches all state receivers and pokes Waybar.
+//! 5. **IPC loop** — `UnixListener` accepting client requests; each connection
+//!    dispatches to [`crate::registry::dispatch`] and returns JSON.
+
 use crate::config::Config;
 use crate::ipc::socket_path;
-use crate::modules::WaybarModule;
+#[cfg(feature = "mod-audio")]
+use crate::modules::audio::AudioDaemon;
+#[cfg(feature = "mod-dbus")]
+use crate::modules::backlight::BacklightDaemon;
+#[cfg(feature = "mod-bt")]
+use crate::modules::bt::BtDaemon;
+#[cfg(feature = "mod-dbus")]
+use crate::modules::dnd::DndDaemon;
+#[cfg(feature = "mod-hardware")]
 use crate::modules::hardware::HardwareDaemon;
+#[cfg(feature = "mod-dbus")]
+use crate::modules::keyboard::KeyboardDaemon;
+#[cfg(feature = "mod-dbus")]
+use crate::modules::mpris::MprisDaemon;
+#[cfg(feature = "mod-network")]
 use crate::modules::network::NetworkDaemon;
-use crate::state::{AppState, SharedState};
+use crate::signaler::WaybarSignaler;
+use crate::state::AppReceivers;
 use anyhow::Result;
+use notify::{Config as NotifyConfig, Event, RecommendedWatcher, RecursiveMode, Watcher};
+use std::collections::HashMap;
 use std::fs;
-use std::io::{BufRead, BufReader, Write};
-use std::net::Shutdown;
-use std::os::unix::net::UnixListener;
 use std::path::PathBuf;
-use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
-use std::sync::{Arc, RwLock};
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
-use std::thread;
+use tokio::net::UnixListener;
-use std::time::Duration;
+use tokio::sync::{RwLock, mpsc, watch};
-use tracing::{debug, error, info, warn};
+use tokio::time::{Duration, sleep};
+use tokio_util::sync::CancellationToken;
+use tracing::{debug, error, info};
+
+/// Spawn a health-tracked polling loop.
+///
+/// Each iteration: skip if in backoff, else await `$poll_expr` and feed the
+/// `Result` to [`crate::health::handle_poll_result`]. The loop breaks when
+/// `$token` is cancelled.
+macro_rules! spawn_poll_loop {
+    ($name:expr, $interval:expr, $health:expr, $token:expr, $poll_expr:expr) => {
+        tokio::spawn(async move {
+            info!(concat!("Starting ", $name, " polling task"));
+            loop {
+                if !crate::health::is_poll_in_backoff($name, &$health).await {
+                    let res: crate::error::Result<()> = $poll_expr.await;
+                    crate::health::handle_poll_result($name, res, &$health).await;
+                }
+                tokio::select! {
+                    _ = $token.cancelled() => break,
+                    _ = sleep($interval) => {}
+                }
+            }
+            info!(concat!($name, " task shut down."));
+        })
+    };
+}
+
+/// Spawn a health-tracked polling loop with an extra trigger channel.
+///
+/// Identical to [`spawn_poll_loop`] but `$trigger` can wake the loop early —
+/// used by the Bluetooth daemon when a client forces an immediate refresh.
+macro_rules! spawn_poll_loop_triggered {
+    ($name:expr, $interval:expr, $health:expr, $token:expr, $trigger:expr, $poll_expr:expr) => {
+        tokio::spawn(async move {
+            info!(concat!("Starting ", $name, " polling task"));
+            loop {
+                if !crate::health::is_poll_in_backoff($name, &$health).await {
+                    let res: crate::error::Result<()> = $poll_expr.await;
+                    crate::health::handle_poll_result($name, res, &$health).await;
+                }
+                tokio::select! {
+                    _ = $token.cancelled() => break,
+                    _ = $trigger.recv() => {},
+                    _ = sleep($interval) => {}
+                }
+            }
+            info!(concat!($name, " task shut down."));
+        })
+    };
+}
+
+/// Spawn a polling loop with no health tracking.
+///
+/// Used for internal daemons (hardware fast/slow) whose poll functions are
+/// infallible and whose failures don't drive client-visible backoff.
+macro_rules! spawn_poll_loop_simple {
+    ($name:expr, $interval:expr, $token:expr, $poll_expr:expr) => {
+        tokio::spawn(async move {
+            info!(concat!("Starting ", $name, " polling task"));
+            loop {
+                $poll_expr.await;
+                tokio::select! {
+                    _ = $token.cancelled() => break,
+                    _ = sleep($interval) => {}
+                }
+            }
+            info!(concat!($name, " task shut down."));
+        })
+    };
+}
 
 struct SocketGuard {
     path: String,
@@ -27,7 +125,16 @@ impl Drop for SocketGuard {
     }
 }
 
-pub fn run_daemon(config_path: Option<PathBuf>) -> Result<()> {
+fn get_config_path(custom_path: Option<PathBuf>) -> PathBuf {
+    custom_path.unwrap_or_else(crate::config::default_config_path)
+}
+
+/// Run the daemon to completion.
+///
+/// Sets up the socket, spawns all enabled module tasks, hooks up config
+/// hot-reloading, and finally enters the IPC accept loop. Returns only on
+/// a fatal error or `Ctrl+C`.
+pub async fn run_daemon(config_path: Option<PathBuf>) -> Result<()> {
     let sock_path = socket_path();
 
     if fs::metadata(&sock_path).is_ok() {
@@ -35,56 +142,306 @@ pub fn run_daemon(config_path: Option<PathBuf>) -> Result<()> {
         fs::remove_file(&sock_path)?;
     }
 
-    let state: SharedState = Arc::new(RwLock::new(AppState::default()));
+    #[cfg(feature = "mod-network")]
+    let (net_tx, net_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-hardware")]
+    let (cpu_tx, cpu_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-hardware")]
+    let (mem_tx, mem_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-hardware")]
+    let (sys_tx, sys_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-hardware")]
+    let (gpu_tx, gpu_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-hardware")]
+    let (disks_tx, disks_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-bt")]
+    let (bt_tx, bt_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-audio")]
+    let (audio_tx, audio_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-dbus")]
+    let (mpris_tx, mpris_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-dbus")]
+    let (backlight_tx, backlight_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-dbus")]
+    let (keyboard_tx, keyboard_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-dbus")]
+    let (dnd_tx, dnd_rx) = watch::channel(Default::default());
+    #[cfg(feature = "mod-dbus")]
+    let mpris_scroll = Arc::new(RwLock::new(crate::state::MprisScrollState::default()));
+    #[cfg(feature = "mod-dbus")]
+    let (mpris_scroll_tick_tx, mpris_scroll_tick_rx) = watch::channel(0u64);
+    let health = Arc::new(RwLock::new(HashMap::new()));
+    #[cfg(feature = "mod-bt")]
+    let (bt_force_tx, mut bt_force_rx) = mpsc::channel(1);
+    #[cfg(feature = "mod-bt")]
+    let bt_cycle = Arc::new(RwLock::new(0usize));
+    #[cfg(feature = "mod-audio")]
+    let (audio_cmd_tx, audio_cmd_rx) = mpsc::channel(8);
+
+    let receivers = AppReceivers {
+        #[cfg(feature = "mod-network")]
+        network: net_rx,
+        #[cfg(feature = "mod-hardware")]
+        cpu: cpu_rx,
+        #[cfg(feature = "mod-hardware")]
+        memory: mem_rx,
+        #[cfg(feature = "mod-hardware")]
+        sys: sys_rx,
+        #[cfg(feature = "mod-hardware")]
+        gpu: gpu_rx,
+        #[cfg(feature = "mod-hardware")]
+        disks: disks_rx,
+        #[cfg(feature = "mod-bt")]
+        bluetooth: bt_rx,
+        #[cfg(feature = "mod-bt")]
+        bt_cycle,
+        #[cfg(feature = "mod-audio")]
+        audio: audio_rx,
+        #[cfg(feature = "mod-dbus")]
+        mpris: mpris_rx,
+        #[cfg(feature = "mod-dbus")]
+        backlight: backlight_rx,
+        #[cfg(feature = "mod-dbus")]
+        keyboard: keyboard_rx,
+        #[cfg(feature = "mod-dbus")]
+        dnd: dnd_rx,
+        #[cfg(feature = "mod-dbus")]
+        mpris_scroll: Arc::clone(&mpris_scroll),
+        #[cfg(feature = "mod-dbus")]
+        mpris_scroll_tick: mpris_scroll_tick_rx,
+        health: Arc::clone(&health),
+        #[cfg(feature = "mod-bt")]
+        bt_force_poll: bt_force_tx,
+        #[cfg(feature = "mod-audio")]
+        audio_cmd_tx,
+    };
+
     let listener = UnixListener::bind(&sock_path)?;
     let _guard = SocketGuard {
         path: sock_path.clone(),
     };
 
-    // Signal handling: set flag so main loop exits cleanly
+    // Ctrl+C triggers a graceful shutdown by cancelling this token; every
-    let running = Arc::new(AtomicBool::new(true));
+    // spawned polling task checks it in its `select!`.
-    let running_clone = Arc::clone(&running);
+    let cancel_token = CancellationToken::new();
-    ctrlc::set_handler(move || {
+    let token_clone = cancel_token.clone();
+    tokio::spawn(async move {
+        tokio::signal::ctrl_c().await.unwrap();
         info!("Received shutdown signal, exiting...");
-        running_clone.store(false, Ordering::SeqCst);
+        token_clone.cancel();
-    })?;
+    });
 
-    // We store the original config_path to allow proper reloading later
+    let resolved_config_path = get_config_path(config_path.clone());
-    let config_path_clone = config_path.clone();
+    let config = Arc::new(RwLock::new(crate::config::load_config(config_path.clone())));
-    let config = Arc::new(RwLock::new(crate::config::load_config(config_path)));
+    spawn_config_watchers(&config, &resolved_config_path);
 
-    let poll_state = Arc::clone(&state);
+    #[cfg(feature = "mod-network")]
-    let poll_running = Arc::clone(&running);
+    if config.read().await.network.enabled {
-    thread::spawn(move || {
+        let mut daemon = NetworkDaemon::new();
-        info!("Starting background polling thread");
+        let token = cancel_token.clone();
-        let mut network_daemon = NetworkDaemon::new();
+        let h = Arc::clone(&health);
-        let mut hardware_daemon = HardwareDaemon::new();
+        spawn_poll_loop!(
-        while poll_running.load(Ordering::SeqCst) {
+            "net",
-            network_daemon.poll(Arc::clone(&poll_state));
+            Duration::from_secs(1),
-            hardware_daemon.poll(Arc::clone(&poll_state));
+            h,
-            thread::sleep(Duration::from_secs(1));
+            token,
+            daemon.poll(&net_tx)
+        );
     }
+
+    // Fast-cycle hardware (cpu/mem/load) polled at 1 Hz.
+    #[cfg(feature = "mod-hardware")]
+    {
+        let cfg = config.read().await;
+        let fast_enabled = cfg.cpu.enabled || cfg.memory.enabled || cfg.sys.enabled;
+        drop(cfg);
+        if fast_enabled {
+            let mut daemon = HardwareDaemon::new();
+            let token = cancel_token.clone();
+            spawn_poll_loop_simple!(
+                "fast_hw",
+                Duration::from_secs(1),
+                token,
+                daemon.poll_fast(&cpu_tx, &mem_tx, &sys_tx)
+            );
+        }
+    }
+
+    // Slow-cycle hardware (gpu/disks) polled every 5 s — expensive to sample.
+    #[cfg(feature = "mod-hardware")]
+    {
+        let cfg = config.read().await;
+        let slow_enabled = cfg.gpu.enabled || cfg.disk.enabled;
+        drop(cfg);
+        if slow_enabled {
+            let mut daemon = HardwareDaemon::new();
+            let token = cancel_token.clone();
+            spawn_poll_loop_simple!(
+                "slow_hw",
+                Duration::from_secs(5),
+                token,
+                daemon.poll_slow(&gpu_tx, &disks_tx)
+            );
+        }
+    }
+
+    #[cfg(feature = "mod-bt")]
+    if config.read().await.bt.enabled {
+        let mut daemon = BtDaemon::new();
+        let token = cancel_token.clone();
+        let h = Arc::clone(&health);
+        let poll_config = Arc::clone(&config);
+        let poll_receivers = receivers.clone();
+        spawn_poll_loop_triggered!("bt", Duration::from_secs(2), h, token, bt_force_rx, async {
+            let config = poll_config.read().await;
+            daemon.poll(&bt_tx, &poll_receivers, &config).await;
+            Ok(())
+        });
+    }
+
+    // Event-driven subsystems — these spawn their own threads internally and
+    // push into their watch sender as events arrive (no polling loop).
+    #[cfg(feature = "mod-audio")]
+    if config.read().await.audio.enabled {
+        let audio_daemon = AudioDaemon::new();
+        audio_daemon.start(&audio_tx, audio_cmd_rx);
+    }
+
+    #[cfg(feature = "mod-dbus")]
+    if config.read().await.backlight.enabled {
+        let backlight_daemon = BacklightDaemon::new();
+        backlight_daemon.start(backlight_tx);
+    }
+
+    #[cfg(feature = "mod-dbus")]
+    if config.read().await.keyboard.enabled {
+        let keyboard_daemon = KeyboardDaemon::new();
+        keyboard_daemon.start(keyboard_tx);
+    }
+
+    #[cfg(feature = "mod-dbus")]
+    if config.read().await.dnd.enabled {
+        let dnd_daemon = DndDaemon::new();
+        dnd_daemon.start(dnd_tx);
+    }
+
+    #[cfg(feature = "mod-dbus")]
+    if config.read().await.mpris.enabled {
+        let mpris_daemon = MprisDaemon::new();
+        mpris_daemon.start(mpris_tx);
+
+        // Ticks the scroll offset forward for the marquee animation.
+        let scroll_config = Arc::clone(&config);
+        let scroll_rx = receivers.mpris.clone();
+        let scroll_state = Arc::clone(&mpris_scroll);
+        tokio::spawn(async move {
+            crate::modules::mpris::mpris_scroll_ticker(
+                scroll_config,
+                scroll_rx,
+                scroll_state,
+                mpris_scroll_tick_tx,
+            )
+            .await;
+        });
+    }
+
+    let signaler = WaybarSignaler::new();
+    let sig_config = Arc::clone(&config);
+    let sig_receivers = receivers.clone();
+    tokio::spawn(async move {
+        info!("Starting Waybar Signaler task");
+        signaler.run(sig_config, sig_receivers).await;
     });
 
     info!("Fluxo daemon successfully bound to socket: {}", sock_path);
+    run_ipc_loop(listener, receivers, config, config_path, cancel_token).await
+}
 
-    // Use non-blocking accept so we can check the running flag
+/// Spawn background tasks that hot-reload the daemon's [`Config`].
-    listener.set_nonblocking(true)?;
+///
+/// Installs a `notify`-based filesystem watcher on the config file's parent
+/// directory, plus a `SIGHUP` handler — either triggers a reload of the
+/// shared `Arc<RwLock<Config>>`.
+fn spawn_config_watchers(config: &Arc<RwLock<Config>>, resolved_path: &std::path::Path) {
+    // `notify` recursively tracks the parent dir so atomic-write editors
+    // (which rename a new file into place) still get picked up.
+    let watcher_config = Arc::clone(config);
+    let watcher_path = resolved_path.to_path_buf();
+    tokio::spawn(async move {
+        let (ev_tx, mut ev_rx) = mpsc::channel(1);
+        let mut watcher = RecommendedWatcher::new(
+            move |res: notify::Result<Event>| {
+                if let Ok(event) = res
+                    && (event.kind.is_modify() || event.kind.is_create())
+                {
+                    let _ = ev_tx.blocking_send(());
+                }
+            },
+            NotifyConfig::default(),
+        )
+        .unwrap();
 
-    while running.load(Ordering::SeqCst) {
+        if let Some(parent) = watcher_path.parent() {
-        match listener.accept() {
+            let _ = watcher.watch(parent, RecursiveMode::NonRecursive);
+        }
+
+        info!("Config watcher started on {:?}", watcher_path);
+
+        loop {
+            tokio::select! {
+                _ = ev_rx.recv() => {
+                    // Coalesce rapid editor writes into one reload.
+                    sleep(Duration::from_millis(100)).await;
+                    while ev_rx.try_recv().is_ok() {}
+                    reload_config(&watcher_config, Some(watcher_path.clone())).await;
+                }
+            }
+        }
+    });
+
+    let hup_config = Arc::clone(config);
+    let hup_path = resolved_path.to_path_buf();
+    tokio::spawn(async move {
+        use tokio::signal::unix::{SignalKind, signal};
+        let mut stream = signal(SignalKind::hangup()).unwrap();
+        loop {
+            stream.recv().await;
+            info!("Received SIGHUP, reloading config...");
+            reload_config(&hup_config, Some(hup_path.clone())).await;
+        }
+    });
+}
+
+/// Accept loop for the client Unix socket.
+///
+/// Each client request spawns a short-lived task that reads one line, looks
+/// up the module via [`crate::registry::dispatch`], and writes the JSON
+/// response back. Broken-pipe errors are logged at `debug` — they just mean
+/// the client timed out before we responded.
+async fn run_ipc_loop(
+    listener: UnixListener,
+    receivers: AppReceivers,
+    config: Arc<RwLock<Config>>,
+    config_path: Option<PathBuf>,
+    cancel_token: CancellationToken,
+) -> Result<()> {
+    loop {
+        tokio::select! {
+            _ = cancel_token.cancelled() => break,
+            res = listener.accept() => {
+                match res {
                     Ok((mut stream, _)) => {
-                let state_clone = Arc::clone(&state);
+                        let state_clone = receivers.clone();
                         let config_clone = Arc::clone(&config);
-                let cp_clone = config_path_clone.clone();
+                        let cp_clone = config_path.clone();
-                thread::spawn(move || {
+                        tokio::spawn(async move {
-                    let mut reader = BufReader::new(&stream);
+                            let (reader, mut writer) = stream.split();
+                            let mut reader = BufReader::new(reader);
                             let mut request = String::new();
-                    if let Err(e) = reader.read_line(&mut request) {
+                            if let Err(e) = reader.read_line(&mut request).await {
                                 error!("Failed to read from IPC stream: {}", e);
                                 return;
                             }
-                    drop(reader);
 
                             let request = request.trim();
                             if request.is_empty() {
@@ -94,92 +451,87 @@ pub fn run_daemon(config_path: Option<PathBuf>) -> Result<()> {
                             let parts: Vec<&str> = request.split_whitespace().collect();
                             if let Some(module_name) = parts.first() {
                                 if *module_name == "reload" {
-                            info!("Reloading configuration...");
+                                    reload_config(&config_clone, cp_clone).await;
-                            let new_config = crate::config::load_config(cp_clone);
+                                    let _ = writer.write_all(b"{\"text\":\"ok\"}").await;
-                            if let Ok(mut config_lock) = config_clone.write() {
-                                *config_lock = new_config;
-                                let _ = stream.write_all(b"{\"text\":\"ok\"}");
-                                info!("Configuration reloaded successfully.");
-                            } else {
-                                error!("Failed to acquire write lock for configuration reload.");
-                            }
-                            let _ = stream.shutdown(Shutdown::Write);
                                     return;
                                 }
 
                                 debug!(module = module_name, args = ?&parts[1..], "Handling IPC request");
                                 let response =
-                            handle_request(module_name, &parts[1..], &state_clone, &config_clone);
+                                    handle_request(module_name, &parts[1..], &state_clone, &config_clone).await;
-                        if let Err(e) = stream.write_all(response.as_bytes()) {
+                                if let Err(e) = writer.write_all(response.as_bytes()).await {
+                                    if e.kind() == std::io::ErrorKind::BrokenPipe
+                                        || e.kind() == std::io::ErrorKind::ConnectionReset
+                                    {
+                                        debug!(
+                                            "IPC client disconnected before response could be sent: {}",
+                                            e
+                                        );
+                                    } else {
                                         error!("Failed to write IPC response: {}", e);
                                     }
-                        let _ = stream.shutdown(Shutdown::Write);
+                                }
                             }
                         });
                     }
-            Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
-                thread::sleep(Duration::from_millis(50));
-            }
                     Err(e) => error!("Failed to accept incoming connection: {}", e),
                 }
             }
+        }
+    }
 
     info!("Daemon shutting down gracefully.");
     Ok(())
 }
 
-fn handle_request(
+/// Re-read the configuration file and swap it into the shared lock.
+pub async fn reload_config(config_lock: &Arc<RwLock<Config>>, path: Option<PathBuf>) {
+    info!("Reloading configuration...");
+    let new_config = crate::config::load_config(path);
+    let mut lock = config_lock.write().await;
+    *lock = new_config;
+    info!("Configuration reloaded successfully.");
+}
+
+/// Evaluate a module with its signaler-default args and return the JSON body.
+///
+/// Used by the [`crate::signaler`] to decide whether the module's output has
+/// actually changed before sending Waybar a signal.
+pub async fn evaluate_module_for_signaler(
+    module_name: &str,
+    state: &AppReceivers,
+    config: &Config,
+) -> Option<String> {
+    let args = crate::registry::signaler_default_args(module_name);
+    crate::registry::dispatch(module_name, config, state, args)
+        .await
+        .ok()
+        .and_then(|out| serde_json::to_string(&out).ok())
+}
+
+async fn handle_request(
     module_name: &str,
     args: &[&str],
-    state: &SharedState,
+    state: &AppReceivers,
     config_lock: &Arc<RwLock<Config>>,
 ) -> String {
-    let config = if let Ok(c) = config_lock.read() {
+    let (is_in_backoff, cached_output) = crate::health::check_backoff(module_name, state).await;
-        c
-    } else {
-        error!("Failed to acquire read lock for configuration.");
-        return "{\"text\":\"error: config lock failed\"}".to_string();
-    };
 
-    let result = match module_name {
+    if is_in_backoff {
-        "net" | "network" => crate::modules::network::NetworkModule.run(&config, state, args),
+        return crate::health::backoff_response(module_name, cached_output);
-        "cpu" => crate::modules::cpu::CpuModule.run(&config, state, args),
-        "mem" | "memory" => crate::modules::memory::MemoryModule.run(&config, state, args),
-        "disk" => crate::modules::disk::DiskModule.run(&config, state, args),
-        "pool" | "btrfs" => crate::modules::btrfs::BtrfsModule.run(&config, state, args),
-        "vol" => crate::modules::audio::AudioModule.run(
-            &config,
-            state,
-            &["sink", args.first().unwrap_or(&"show")],
-        ),
-        "mic" => crate::modules::audio::AudioModule.run(
-            &config,
-            state,
-            &["source", args.first().unwrap_or(&"show")],
-        ),
-        "gpu" => crate::modules::gpu::GpuModule.run(&config, state, args),
-        "sys" => crate::modules::sys::SysModule.run(&config, state, args),
-        "bt" | "bluetooth" => crate::modules::bt::BtModule.run(&config, state, args),
-        "buds" => crate::modules::buds::BudsModule.run(&config, state, args),
-        "power" => crate::modules::power::PowerModule.run(&config, state, args),
-        "game" => crate::modules::game::GameModule.run(&config, state, args),
-        _ => {
-            warn!("Received request for unknown module: '{}'", module_name);
-            Err(anyhow::anyhow!("Unknown module: {}", module_name))
     }
-    };
+
+    let config = config_lock.read().await;
+    let result = crate::registry::dispatch(module_name, &config, state, args).await;
+
+    crate::health::update_health(module_name, &result, state).await;
 
     match result {
         Ok(output) => serde_json::to_string(&output).unwrap_or_else(|_| "{}".to_string()),
-        Err(e) => {
+        Err(crate::error::FluxoError::Disabled(_)) => {
-            error!(module = module_name, error = %e, "Module execution failed");
+            serde_json::to_string(&crate::output::WaybarOutput::disabled())
-            let err_out = crate::output::WaybarOutput {
+                .unwrap_or_else(|_| "{}".to_string())
-                text: "\u{200B}Error\u{200B}".to_string(),
+        }
-                tooltip: Some(e.to_string()),
+        Err(e) => crate::health::error_response(module_name, &e, cached_output),
-                class: Some("error".to_string()),
-                percentage: None,
-            };
-            serde_json::to_string(&err_out).unwrap_or_else(|_| "{}".to_string())
-        }
     }
 }

src/error.rs

@@ -0,0 +1,67 @@
+//! Error types used across the crate.
+
+use thiserror::Error;
+
+/// Canonical error type for all fluxo subsystems.
+///
+/// Errors are categorised so that [`FluxoError::is_transient`] can distinguish
+/// temporary runtime failures (retried with backoff) from permanent ones.
+#[derive(Error, Debug)]
+#[allow(dead_code)]
+pub enum FluxoError {
+    #[error("Configuration error: {0}")]
+    Config(String),
+
+    #[error("Module error ({module}): {message}")]
+    Module {
+        module: &'static str,
+        message: String,
+    },
+
+    #[error("Daemon IPC error: {0}")]
+    Ipc(String),
+
+    #[error("External system error: {0}")]
+    System(String),
+
+    #[error("Bluetooth error: {0}")]
+    Bluetooth(String),
+
+    #[error("Network error: {0}")]
+    Network(String),
+
+    #[error("Hardware error: {0}")]
+    Hardware(String),
+
+    #[error("IO error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("Serialization error: {0}")]
+    Serialization(#[from] serde_json::Error),
+
+    #[error("Module disabled: {0}")]
+    Disabled(String),
+
+    #[error("Other error: {0}")]
+    Other(#[from] anyhow::Error),
+}
+
+impl FluxoError {
+    /// Returns `true` for errors that represent likely-transient failures
+    /// (IO, external systems, hardware) and should trigger exponential backoff
+    /// rather than permanent cooldown.
+    pub fn is_transient(&self) -> bool {
+        matches!(
+            self,
+            Self::Io(_)
+                | Self::System(_)
+                | Self::Bluetooth(_)
+                | Self::Network(_)
+                | Self::Hardware(_)
+                | Self::Module { .. }
+        )
+    }
+}
+
+/// Crate-wide `Result` alias using [`FluxoError`].
+pub type Result<T> = std::result::Result<T, FluxoError>;

src/health.rs

@@ -0,0 +1,144 @@
+//! Per-module health tracking and exponential backoff.
+//!
+//! Both the IPC request handler (for on-demand module evaluation) and the
+//! background polling loops consult this module. Transient errors increment a
+//! failure counter that grows the cooldown window; permanent errors trigger an
+//! immediate long cooldown.
+
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, ModuleHealth};
+use std::collections::HashMap;
+use std::sync::Arc;
+use tokio::sync::RwLock;
+use tokio::time::{Duration, Instant};
+use tracing::{debug, error, info, warn};
+
+/// Check if a module is in backoff (used by request handler).
+pub async fn check_backoff(
+    module_name: &str,
+    state: &AppReceivers,
+) -> (bool, Option<WaybarOutput>) {
+    let lock = state.health.read().await;
+    if let Some(health) = lock.get(module_name) {
+        let in_backoff = health
+            .backoff_until
+            .is_some_and(|until| Instant::now() < until);
+        (in_backoff, health.last_successful_output.clone())
+    } else {
+        (false, None)
+    }
+}
+
+/// Update health after a request dispatch (used by request handler).
+pub async fn update_health(
+    module_name: &str,
+    result: &Result<WaybarOutput, crate::error::FluxoError>,
+    state: &AppReceivers,
+) {
+    let mut lock = state.health.write().await;
+    let health = lock.entry(module_name.to_string()).or_default();
+    match result {
+        Ok(output) => {
+            health.consecutive_failures = 0;
+            health.backoff_until = None;
+            health.last_successful_output = Some(output.clone());
+        }
+        Err(crate::error::FluxoError::Disabled(_)) => {}
+        Err(e) => {
+            health.consecutive_failures += 1;
+            health.last_failure = Some(Instant::now());
+            if health.consecutive_failures >= 3 {
+                health.backoff_until = Some(Instant::now() + Duration::from_secs(30));
+                warn!(module = module_name, error = %e, "Module entered backoff state due to repeated failures");
+            }
+        }
+    }
+}
+
+/// Check if a polling daemon module is in backoff.
+pub async fn is_poll_in_backoff(
+    module_name: &str,
+    health_lock: &Arc<RwLock<HashMap<String, ModuleHealth>>>,
+) -> bool {
+    let lock = health_lock.read().await;
+    if let Some(health) = lock.get(module_name)
+        && let Some(until) = health.backoff_until
+    {
+        return Instant::now() < until;
+    }
+    false
+}
+
+/// Update health after a polling daemon result.
+pub async fn handle_poll_result(
+    module_name: &str,
+    result: crate::error::Result<()>,
+    health_lock: &Arc<RwLock<HashMap<String, ModuleHealth>>>,
+) {
+    let mut lock = health_lock.write().await;
+    let health = lock.entry(module_name.to_string()).or_default();
+
+    match result {
+        Ok(_) => {
+            if health.consecutive_failures > 0 {
+                info!(
+                    module = module_name,
+                    "Module recovered after {} failures", health.consecutive_failures
+                );
+            }
+            health.consecutive_failures = 0;
+            health.backoff_until = None;
+        }
+        Err(e) => {
+            health.consecutive_failures += 1;
+            health.last_failure = Some(Instant::now());
+
+            if !e.is_transient() {
+                health.backoff_until = Some(Instant::now() + Duration::from_secs(60));
+                error!(module = module_name, error = %e, "Fatal module error, entering long cooldown");
+            } else if health.consecutive_failures >= 3 {
+                let backoff_secs = 30 * (2u64.pow(health.consecutive_failures.saturating_sub(3)));
+                let backoff_secs = backoff_secs.min(3600);
+                health.backoff_until = Some(Instant::now() + Duration::from_secs(backoff_secs));
+                warn!(module = module_name, error = %e, backoff = backoff_secs, "Repeated transient failures, entering backoff");
+            } else {
+                debug!(module = module_name, error = %e, "Transient module failure (attempt {})", health.consecutive_failures);
+            }
+        }
+    }
+}
+
+/// Serialise a response to return while a module is cooling down.
+///
+/// If a cached successful output exists, it is returned with a `warning` CSS
+/// class appended; otherwise a generic "Cooling down" placeholder is emitted.
+pub fn backoff_response(module_name: &str, cached: Option<WaybarOutput>) -> String {
+    if let Some(mut cached) = cached {
+        let class = cached.class.unwrap_or_default();
+        cached.class = Some(format!("{} warning", class).trim().to_string());
+        return serde_json::to_string(&cached).unwrap_or_else(|_| "{}".to_string());
+    }
+    let zws = crate::output::ZERO_WIDTH_SPACE;
+    format!("{{\"text\":\"{zws}Cooling down ({module_name}){zws}\",\"class\":\"error\"}}")
+}
+
+/// Serialise a fallback response for a module that errored this request.
+///
+/// Prefers showing the last successful cached output (with a `warning` class)
+/// over a bare error text, to keep the bar visually stable.
+pub fn error_response(
+    module_name: &str,
+    e: &crate::error::FluxoError,
+    cached: Option<WaybarOutput>,
+) -> String {
+    if let Some(mut cached) = cached {
+        let class = cached.class.unwrap_or_default();
+        cached.class = Some(format!("{} warning", class).trim().to_string());
+        return serde_json::to_string(&cached).unwrap_or_else(|_| "{}".to_string());
+    }
+
+    let error_msg = e.to_string();
+    error!(module = module_name, error = %error_msg, "Module execution failed");
+    let err_out = WaybarOutput::error(&error_msg);
+    serde_json::to_string(&err_out).unwrap_or_else(|_| "{}".to_string())
+}

src/help.rs

@@ -0,0 +1,499 @@
+//! Human-readable help output for all available modules.
+//!
+//! `fluxo help` prints an overview of every module with its aliases, arguments,
+//! and format tokens. `fluxo help <module>` shows the detailed page for a
+//! single module.
+
+/// Module help descriptor used to build the help output.
+struct ModuleHelp {
+    /// Primary display name.
+    name: &'static str,
+    /// CLI aliases that dispatch to this module.
+    aliases: &'static [&'static str],
+    /// Cargo feature gate required at compile time.
+    feature: &'static str,
+    /// One-line summary of what the module does.
+    summary: &'static str,
+    /// Argument synopsis in `[arg]` notation.
+    args_synopsis: &'static str,
+    /// Detailed argument descriptions.
+    args_detail: &'static [(&'static str, &'static str)],
+    /// Format tokens available in `config.toml`.
+    tokens: &'static [(&'static str, &'static str)],
+    /// Concrete usage examples.
+    examples: &'static [(&'static str, &'static str)],
+}
+
+/// All module descriptors, ordered by category.
+const MODULES: &[ModuleHelp] = &[
+    // ── Hardware ─────────────────────────────────────────────────────
+    ModuleHelp {
+        name: "cpu",
+        aliases: &["cpu"],
+        feature: "mod-hardware",
+        summary: "CPU usage percentage and temperature.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("usage", "CPU usage as a percentage (0.0 - 100.0)"),
+            ("temp", "CPU temperature in degrees Celsius"),
+        ],
+        examples: &[("fluxo cpu", "Show current CPU usage and temperature")],
+    },
+    ModuleHelp {
+        name: "memory",
+        aliases: &["mem", "memory"],
+        feature: "mod-hardware",
+        summary: "RAM usage in gigabytes with usage classification.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("used", "Used memory in GB"),
+            ("total", "Total memory in GB"),
+        ],
+        examples: &[("fluxo mem", "Show current RAM usage")],
+    },
+    ModuleHelp {
+        name: "sys",
+        aliases: &["sys"],
+        feature: "mod-hardware",
+        summary: "Uptime, load averages, and process count.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("uptime", "Human-readable uptime (e.g. \"2d 5h\")"),
+            ("load1", "1-minute load average"),
+            ("load5", "5-minute load average"),
+            ("load15", "15-minute load average"),
+            ("procs", "Number of running processes"),
+        ],
+        examples: &[("fluxo sys", "Show system uptime and load")],
+    },
+    ModuleHelp {
+        name: "gpu",
+        aliases: &["gpu"],
+        feature: "mod-hardware",
+        summary: "GPU usage, VRAM, and temperature (AMD/NVIDIA/Intel).",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("usage", "GPU utilisation percentage"),
+            ("vram_used", "Used VRAM in GB (AMD/NVIDIA)"),
+            ("vram_total", "Total VRAM in GB (AMD/NVIDIA)"),
+            ("temp", "GPU temperature in Celsius (AMD/NVIDIA)"),
+            ("freq", "GPU frequency in MHz (Intel)"),
+        ],
+        examples: &[("fluxo gpu", "Show GPU stats for the detected vendor")],
+    },
+    ModuleHelp {
+        name: "disk",
+        aliases: &["disk"],
+        feature: "mod-hardware",
+        summary: "Filesystem usage for a given mount point.",
+        args_synopsis: "[mountpoint]",
+        args_detail: &[(
+            "mountpoint",
+            "Path to the mount point to display (default: \"/\")",
+        )],
+        tokens: &[
+            ("mount", "The mount point path"),
+            ("used", "Used space in GB"),
+            ("total", "Total space in GB"),
+        ],
+        examples: &[
+            ("fluxo disk", "Show usage of the root filesystem (/)"),
+            ("fluxo disk /home", "Show usage of /home"),
+        ],
+    },
+    ModuleHelp {
+        name: "pool",
+        aliases: &["pool", "btrfs"],
+        feature: "mod-hardware",
+        summary: "Aggregated Btrfs pool usage across all btrfs mounts.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("used", "Total used space in GB across all btrfs mounts"),
+            ("total", "Total capacity in GB across all btrfs mounts"),
+        ],
+        examples: &[
+            ("fluxo pool", "Show combined Btrfs pool usage"),
+            ("fluxo btrfs", "Same as above (alias)"),
+        ],
+    },
+    ModuleHelp {
+        name: "power",
+        aliases: &["power"],
+        feature: "mod-hardware",
+        summary: "Battery percentage and charge state from sysfs.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("percentage", "Battery level (0 - 100)"),
+            ("icon", "State icon (varies by charge level and AC status)"),
+        ],
+        examples: &[("fluxo power", "Show battery status")],
+    },
+    ModuleHelp {
+        name: "game",
+        aliases: &["game"],
+        feature: "mod-hardware",
+        summary: "Gamemode indicator (Hyprland animation state).",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[],
+        examples: &[("fluxo game", "Show whether gamemode is active")],
+    },
+    // ── Network ──────────────────────────────────────────────────────
+    ModuleHelp {
+        name: "network",
+        aliases: &["net", "network"],
+        feature: "mod-network",
+        summary: "Primary network interface, IP, and transfer rates.",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("interface", "Active interface name (e.g. \"wlan0\")"),
+            ("ip", "IPv4 address of the active interface"),
+            ("rx", "Receive rate in MB/s"),
+            ("tx", "Transmit rate in MB/s"),
+        ],
+        examples: &[("fluxo net", "Show network status and throughput")],
+    },
+    // ── Audio ────────────────────────────────────────────────────────
+    ModuleHelp {
+        name: "vol (sink)",
+        aliases: &["vol"],
+        feature: "mod-audio",
+        summary: "PulseAudio/PipeWire output (sink) volume and controls.",
+        args_synopsis: "[show|up|down|mute|cycle] [step]",
+        args_detail: &[
+            (
+                "show",
+                "Display current sink volume and mute state (default)",
+            ),
+            ("up", "Increase volume by <step> percent (default: 5)"),
+            ("down", "Decrease volume by <step> percent (default: 5)"),
+            ("mute", "Toggle mute on the default sink"),
+            ("cycle", "Switch to the next available output device"),
+            ("step", "Volume change increment in percent (default: 5)"),
+        ],
+        tokens: &[
+            ("name", "Device description (truncated to 20 chars)"),
+            ("icon", "Volume-level icon (changes with volume/mute)"),
+            ("volume", "Current volume percentage (0 - 150)"),
+        ],
+        examples: &[
+            ("fluxo vol", "Show current sink volume"),
+            ("fluxo vol up", "Increase volume by 5%"),
+            ("fluxo vol up 10", "Increase volume by 10%"),
+            ("fluxo vol down 2", "Decrease volume by 2%"),
+            ("fluxo vol mute", "Toggle sink mute"),
+            ("fluxo vol cycle", "Switch to next output device"),
+        ],
+    },
+    ModuleHelp {
+        name: "mic (source)",
+        aliases: &["mic"],
+        feature: "mod-audio",
+        summary: "PulseAudio/PipeWire input (source/microphone) controls.",
+        args_synopsis: "[show|up|down|mute|cycle] [step]",
+        args_detail: &[
+            (
+                "show",
+                "Display current source volume and mute state (default)",
+            ),
+            ("up", "Increase mic volume by <step> percent (default: 5)"),
+            ("down", "Decrease mic volume by <step> percent (default: 5)"),
+            ("mute", "Toggle mute on the default source"),
+            ("cycle", "Switch to the next available input device"),
+            ("step", "Volume change increment in percent (default: 5)"),
+        ],
+        tokens: &[
+            ("name", "Device description (truncated to 20 chars)"),
+            ("icon", "Microphone icon (changes with mute state)"),
+            ("volume", "Current volume percentage (0 - 150)"),
+        ],
+        examples: &[
+            ("fluxo mic", "Show current microphone volume"),
+            ("fluxo mic mute", "Toggle microphone mute"),
+            ("fluxo mic up 10", "Increase mic volume by 10%"),
+        ],
+    },
+    // ── Bluetooth ────────────────────────────────────────────────────
+    ModuleHelp {
+        name: "bluetooth",
+        aliases: &["bt", "bluetooth"],
+        feature: "mod-bt",
+        summary: "Bluetooth device status, connection management, and plugin modes.",
+        args_synopsis: "[show|connect|disconnect|cycle|menu|get_modes|set_mode|cycle_mode] [args...]",
+        args_detail: &[
+            ("show", "Display the active device's status (default)"),
+            (
+                "connect <mac>",
+                "Connect to the device with the given MAC address",
+            ),
+            (
+                "disconnect [mac]",
+                "Disconnect the active device, or a specific MAC",
+            ),
+            (
+                "cycle",
+                "Cycle through connected devices (multi-device setups)",
+            ),
+            (
+                "menu",
+                "Open an interactive device picker (client-side, uses menu_command)",
+            ),
+            (
+                "get_modes [mac]",
+                "List available plugin modes (e.g. ANC modes for Pixel Buds)",
+            ),
+            (
+                "set_mode <mode> [mac]",
+                "Set a plugin mode on the active or specified device",
+            ),
+            ("cycle_mode [mac]", "Advance to the next plugin mode"),
+        ],
+        tokens: &[
+            ("alias", "Device display name (e.g. \"Pixel Buds Pro\")"),
+            ("mac", "Device MAC address"),
+            ("left", "Left earbud battery (plugin, e.g. \"85%\")"),
+            ("right", "Right earbud battery (plugin, e.g. \"90%\")"),
+            (
+                "anc",
+                "ANC mode label (plugin, e.g. \"ANC\", \"Aware\", \"Off\")",
+            ),
+        ],
+        examples: &[
+            ("fluxo bt", "Show the active BT device"),
+            (
+                "fluxo bt connect AA:BB:CC:DD:EE:FF",
+                "Connect to a specific device",
+            ),
+            ("fluxo bt disconnect", "Disconnect the active device"),
+            ("fluxo bt menu", "Open the interactive BT device menu"),
+            ("fluxo bt cycle_mode", "Toggle ANC mode on Pixel Buds"),
+            ("fluxo bt set_mode aware", "Set ANC to aware mode"),
+        ],
+    },
+    // ── D-Bus ────────────────────────────────────────────────────────
+    ModuleHelp {
+        name: "mpris",
+        aliases: &["mpris"],
+        feature: "mod-dbus",
+        summary: "MPRIS media player status (artist, title, playback state).",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("artist", "Current track artist"),
+            ("title", "Current track title"),
+            ("album", "Current track album"),
+            ("status_icon", "Playback icon (play/pause/stop glyph)"),
+        ],
+        examples: &[("fluxo mpris", "Show current media player status")],
+    },
+    ModuleHelp {
+        name: "backlight",
+        aliases: &["backlight"],
+        feature: "mod-dbus",
+        summary: "Screen brightness percentage (inotify-driven).",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[
+            ("percentage", "Current brightness level (0 - 100)"),
+            ("icon", "Brightness bucket icon"),
+        ],
+        examples: &[("fluxo backlight", "Show current screen brightness")],
+    },
+    ModuleHelp {
+        name: "keyboard",
+        aliases: &["kbd", "keyboard"],
+        feature: "mod-dbus",
+        summary: "Active keyboard layout (Hyprland event-driven).",
+        args_synopsis: "",
+        args_detail: &[],
+        tokens: &[(
+            "layout",
+            "Active keyboard layout name (e.g. \"English (US)\")",
+        )],
+        examples: &[("fluxo kbd", "Show the current keyboard layout")],
+    },
+    ModuleHelp {
+        name: "dnd",
+        aliases: &["dnd"],
+        feature: "mod-dbus",
+        summary: "Do-Not-Disturb toggle (SwayNC signal-driven / Dunst polling).",
+        args_synopsis: "[show|toggle]",
+        args_detail: &[
+            ("show", "Display the current DND state (default)"),
+            ("toggle", "Toggle DND on/off via the notification daemon"),
+        ],
+        tokens: &[],
+        examples: &[
+            ("fluxo dnd", "Show current DND state"),
+            ("fluxo dnd toggle", "Toggle Do-Not-Disturb"),
+        ],
+    },
+];
+
+/// Print help for all modules or a single module by name.
+pub fn print_help(module: Option<&str>) {
+    if let Some(name) = module {
+        let found = MODULES.iter().find(|m| {
+            m.aliases.iter().any(|a| a.eq_ignore_ascii_case(name))
+                || m.name.eq_ignore_ascii_case(name)
+        });
+
+        match found {
+            Some(m) => print_module_detail(m),
+            None => {
+                eprintln!("Unknown module: \"{}\"\n", name);
+                eprintln!("Run `fluxo help` to see all available modules.");
+                std::process::exit(1);
+            }
+        }
+    } else {
+        print_overview();
+    }
+}
+
+fn print_overview() {
+    println!("\x1b[1;36mfluxo\x1b[0m — high-performance daemon/client for Waybar custom modules\n");
+
+    println!("\x1b[1mUSAGE:\x1b[0m");
+    println!("    fluxo daemon [--config <path>]    Start the background daemon");
+    println!("    fluxo reload                      Hot-reload the daemon config");
+    println!("    fluxo <module> [args...]           Query or control a module");
+    println!("    fluxo help [module]                Show this help or module details\n");
+
+    println!("\x1b[1mCONFIGURATION:\x1b[0m");
+    println!("    Config file:  $XDG_CONFIG_HOME/fluxo/config.toml");
+    println!("    Format tokens in config strings use {{token}} syntax.");
+    println!("    Run `fluxo help <module>` to see available tokens.\n");
+
+    let categories: &[(&str, &[&str])] = &[
+        (
+            "Hardware",
+            &[
+                "cpu", "memory", "sys", "gpu", "disk", "pool", "power", "game",
+            ],
+        ),
+        ("Network", &["network"]),
+        ("Audio", &["vol (sink)", "mic (source)"]),
+        ("Bluetooth", &["bluetooth"]),
+        ("D-Bus", &["mpris", "backlight", "keyboard", "dnd"]),
+    ];
+
+    println!("\x1b[1mMODULES:\x1b[0m\n");
+
+    for (category, names) in categories {
+        println!(
+            "  \x1b[1;33m{}\x1b[0m  ({})",
+            category,
+            feature_for_category(category)
+        );
+        for module_name in *names {
+            if let Some(m) = MODULES.iter().find(|m| m.name == *module_name) {
+                let aliases = m.aliases.join(", ");
+                println!("    \x1b[1;32m{:<18}\x1b[0m {}", aliases, m.summary,);
+                if !m.args_synopsis.is_empty() {
+                    println!("    {:<18} args: {}", "", m.args_synopsis,);
+                }
+            }
+        }
+        println!();
+    }
+
+    println!("\x1b[1mEXAMPLES:\x1b[0m\n");
+    println!("    fluxo daemon                Start the daemon");
+    println!("    fluxo cpu                   Show CPU usage and temperature");
+    println!("    fluxo vol up 10             Increase volume by 10%");
+    println!("    fluxo bt menu               Open Bluetooth device picker");
+    println!("    fluxo dnd toggle            Toggle Do-Not-Disturb");
+    println!("    fluxo help vol              Show detailed help for the volume module");
+    println!();
+    println!("For detailed module info: \x1b[1mfluxo help <module>\x1b[0m");
+}
+
+fn print_module_detail(m: &ModuleHelp) {
+    println!("\x1b[1;36mfluxo {}\x1b[0m — {}\n", m.name, m.summary);
+
+    // Aliases
+    if m.aliases.len() > 1
+        || m.aliases.first() != Some(&m.name.split_whitespace().next().unwrap_or(m.name))
+    {
+        println!("\x1b[1mALIASES:\x1b[0m  {}", m.aliases.join(", "));
+        println!();
+    }
+
+    // Feature gate
+    println!("\x1b[1mFEATURE:\x1b[0m  {}", m.feature);
+    println!();
+
+    // Usage
+    println!("\x1b[1mUSAGE:\x1b[0m");
+    let primary = m.aliases.first().unwrap_or(&m.name);
+    if m.args_synopsis.is_empty() {
+        println!("    fluxo {}", primary);
+    } else {
+        println!("    fluxo {} {}", primary, m.args_synopsis);
+    }
+    println!();
+
+    // Arguments
+    if !m.args_detail.is_empty() {
+        println!("\x1b[1mARGUMENTS:\x1b[0m\n");
+        let max_name = m
+            .args_detail
+            .iter()
+            .map(|(n, _)| n.len())
+            .max()
+            .unwrap_or(0);
+        for (name, desc) in m.args_detail {
+            println!(
+                "    \x1b[32m{:<width$}\x1b[0m    {}",
+                name,
+                desc,
+                width = max_name
+            );
+        }
+        println!();
+    }
+
+    // Format tokens
+    if !m.tokens.is_empty() {
+        println!("\x1b[1mFORMAT TOKENS:\x1b[0m  (for use in config.toml format strings)\n");
+        let max_token = m.tokens.iter().map(|(t, _)| t.len()).max().unwrap_or(0);
+        for (token, desc) in m.tokens {
+            let padded = format!("{{{}}}", token);
+            println!(
+                "    \x1b[33m{:<width$}\x1b[0m  {}",
+                padded,
+                desc,
+                width = max_token + 2 // +2 for the braces
+            );
+        }
+        println!();
+    }
+
+    // Examples
+    if !m.examples.is_empty() {
+        println!("\x1b[1mEXAMPLES:\x1b[0m\n");
+        for (cmd, desc) in m.examples {
+            println!("    \x1b[1m$\x1b[0m {:<34}  # {}", cmd, desc);
+        }
+        println!();
+    }
+}
+
+fn feature_for_category(category: &str) -> &'static str {
+    match category {
+        "Hardware" => "mod-hardware",
+        "Network" => "mod-network",
+        "Audio" => "mod-audio",
+        "Bluetooth" => "mod-bt",
+        "D-Bus" => "mod-dbus",
+        _ => "default",
+    }
+}

src/ipc.rs

@@ -1,8 +1,16 @@
+//! Client/daemon Unix socket IPC.
+//!
+//! Requests are newline-terminated `module arg1 arg2...` lines; responses are
+//! the daemon's JSON payload written until EOF.
+
 use std::io::{Read, Write};
 use std::os::unix::net::UnixStream;
 use std::time::Duration;
 use tracing::debug;
 
+/// Returns the path to the daemon's Unix socket.
+///
+/// Prefers `$XDG_RUNTIME_DIR/fluxo.sock`, falling back to `/tmp/fluxo.sock`.
 pub fn socket_path() -> String {
     if let Ok(dir) = std::env::var("XDG_RUNTIME_DIR") {
         format!("{}/fluxo.sock", dir)
@@ -11,13 +19,15 @@ pub fn socket_path() -> String {
     }
 }
 
+/// Send a module invocation to the daemon and return its response body.
+///
+/// Blocks for up to 5 seconds waiting for the daemon to reply.
 pub fn request_data(module: &str, args: &[&str]) -> anyhow::Result<String> {
     let sock = socket_path();
     debug!(module, ?args, "Connecting to daemon socket: {}", sock);
     let mut stream = UnixStream::connect(&sock)?;
     stream.set_read_timeout(Some(Duration::from_secs(5)))?;
 
-    // Send module and args
     let mut request = module.to_string();
     for arg in args {
         request.push(' ');

src/macros.rs

@@ -0,0 +1,43 @@
+//! Central declarative macro that registers every watched module.
+//!
+//! Every piece of per-module boilerplate (AppReceivers field, IPC dispatch arm,
+//! signaler future binding, signaler select arm, config enabled-lookup, default
+//! signaler args) is generated from this single table. Adding a new module is
+//! a one-line edit here plus writing the module file itself.
+
+/// Central module registry. Defines all modules with watch channels in one place.
+///
+/// Invoke with a callback macro name. The callback receives repeated entries of the form:
+///   { $feature:literal, $field:ident, $state:ty, [$($name:literal),+], [$($sig_name:literal),+], $module:path, $signal:ident, [$($default_arg:literal),*], $config:ident }
+///
+/// Fields:
+///   - feature:       Cargo feature gate (e.g., "mod-network")
+///   - field:         AppReceivers field name (e.g., network)
+///   - state:         State type for the watch channel (e.g., NetworkState)
+///   - names:         CLI name aliases for dispatch (e.g., ["net", "network"])
+///   - signaler_names: Waybar module names to signal when the channel fires
+///     (usually [first dispatch name], but audio signals ["vol", "mic"])
+///   - module:        Module struct implementing WaybarModule (e.g., network::NetworkModule)
+///   - signal:        SignalsConfig field name (e.g., network)
+///   - default_args:  Default args for signaler evaluation
+///   - config:        Config section field name (e.g., network)
+///
+/// Modules without watch channels (power, game, pool/btrfs) are handled manually.
+macro_rules! for_each_watched_module {
+    ($m:ident) => {
+        $m! {
+            { "mod-network",  network,   crate::state::NetworkState,       ["net", "network"],  ["net"],        crate::modules::network::NetworkModule,     network,   [],               network   }
+            { "mod-hardware", cpu,       crate::state::CpuState,           ["cpu"],             ["cpu"],        crate::modules::cpu::CpuModule,             cpu,       [],               cpu       }
+            { "mod-hardware", memory,    crate::state::MemoryState,        ["mem", "memory"],   ["mem"],        crate::modules::memory::MemoryModule,       memory,    [],               memory    }
+            { "mod-hardware", sys,       crate::state::SysState,           ["sys"],             ["sys"],        crate::modules::sys::SysModule,             sys,       [],               sys       }
+            { "mod-hardware", gpu,       crate::state::GpuState,           ["gpu"],             ["gpu"],        crate::modules::gpu::GpuModule,             gpu,       [],               gpu       }
+            { "mod-hardware", disks,     Vec<crate::state::DiskInfo>,      ["disk"],            ["disk"],       crate::modules::disk::DiskModule,           disk,      ["/"],            disk      }
+            { "mod-bt",       bluetooth, crate::state::BtState,            ["bt", "bluetooth"], ["bt"],         crate::modules::bt::BtModule,               bt,        ["show"],         bt        }
+            { "mod-audio",    audio,     crate::state::AudioState,         ["vol", "audio"],    ["vol", "mic"], crate::modules::audio::AudioModule,         audio,     ["sink", "show"], audio     }
+            { "mod-dbus",     mpris,     crate::state::MprisState,         ["mpris"],           ["mpris"],      crate::modules::mpris::MprisModule,         mpris,     [],               mpris     }
+            { "mod-dbus",     backlight, crate::state::BacklightState,     ["backlight"],       ["backlight"],  crate::modules::backlight::BacklightModule, backlight, [],               backlight }
+            { "mod-dbus",     keyboard,  crate::state::KeyboardState,      ["kbd", "keyboard"], ["kbd"],        crate::modules::keyboard::KeyboardModule,   keyboard,  [],               keyboard  }
+            { "mod-dbus",     dnd,       crate::state::DndState,           ["dnd"],             ["dnd"],        crate::modules::dnd::DndModule,             dnd,       [],               dnd       }
+        }
+    };
+}

src/main.rs

@@ -1,23 +1,84 @@
+//! `fluxo` — high-performance daemon/client for Waybar custom modules.
+//!
+//! The binary has two faces:
+//! * `fluxo daemon` — starts a long-lived process that polls system state
+//!   (network, cpu, audio, bluetooth, …) on background tasks and exposes the
+//!   results over a Unix socket. It also sends `SIGRTMIN+N` signals to Waybar
+//!   when module output changes, so the bar refreshes instantly.
+//! * `fluxo <module> [args]` — a tiny client that asks the daemon to evaluate
+//!   a single module and prints the Waybar-compatible JSON to stdout.
+//!
+//! Modules are feature-gated at compile time (`mod-audio`, `mod-bt`, `mod-dbus`,
+//! `mod-hardware`, `mod-network`) and registered centrally via the
+//! [`for_each_watched_module!`] macro in [`mod@macros`].
+
+#[macro_use]
+mod macros;
+#[cfg(feature = "mod-bt")]
+mod bt_menu;
+mod client;
 mod config;
 mod daemon;
+mod error;
+mod health;
+mod help;
 mod ipc;
 mod modules;
 mod output;
+mod registry;
+mod signaler;
 mod state;
 mod utils;
 
-use clap::{Parser, Subcommand};
+use clap::{Parser, Subcommand, ValueEnum};
 use std::path::PathBuf;
 use std::process;
 use tracing::{error, info};
 use tracing_subscriber::{EnvFilter, fmt, prelude::*};
 
+#[derive(Clone, ValueEnum)]
+enum LogLevel {
+    Trace,
+    Debug,
+    Info,
+    Warn,
+    Error,
+}
+
+impl From<LogLevel> for tracing::Level {
+    fn from(level: LogLevel) -> Self {
+        match level {
+            LogLevel::Trace => tracing::Level::TRACE,
+            LogLevel::Debug => tracing::Level::DEBUG,
+            LogLevel::Info => tracing::Level::INFO,
+            LogLevel::Warn => tracing::Level::WARN,
+            LogLevel::Error => tracing::Level::ERROR,
+        }
+    }
+}
+
 #[derive(Parser)]
 #[command(name = "fluxo")]
 #[command(about = "A high-performance daemon/client for Waybar custom modules", long_about = None)]
+#[command(disable_help_subcommand = true, disable_help_flag = true)]
 struct Cli {
     #[command(subcommand)]
-    command: Commands,
+    command: Option<Commands>,
+
+    /// Print help information
+    #[arg(short, long, global = true)]
+    help: bool,
+
+    /// Set the log level (trace, debug, info, warn, error)
+    #[arg(long, global = true, value_enum)]
+    loglevel: Option<LogLevel>,
+
+    /// Module name to query or interact with
+    module: Option<String>,
+
+    /// Arguments to pass to the module
+    #[arg(trailing_var_arg = true)]
+    args: Vec<String>,
 }
 
 #[derive(Subcommand)]
@@ -30,70 +91,46 @@ enum Commands {
     },
     /// Reload the daemon configuration
     Reload,
-    /// Network speed module
+    /// Show detailed help for all modules or a specific module
-    #[command(alias = "network")]
+    Help {
-    Net,
+        /// Optional module name to show detailed help for
-    /// CPU usage and temp module
+        module: Option<String>,
-    Cpu,
-    /// Memory usage module
-    #[command(alias = "memory")]
-    Mem,
-    /// Disk usage module (path defaults to /)
-    Disk {
-        #[arg(default_value = "/")]
-        path: String,
     },
-    /// Storage pool aggregate module (e.g., btrfs)
-    #[command(alias = "btrfs")]
-    Pool {
-        #[arg(default_value = "btrfs")]
-        kind: String,
-    },
-    /// Audio volume (sink) control
-    Vol {
-        /// Cycle to the next available output device
-        #[arg(short, long)]
-        cycle: bool,
-    },
-    /// Microphone (source) control
-    Mic {
-        /// Cycle to the next available input device
-        #[arg(short, long)]
-        cycle: bool,
-    },
-    /// GPU usage, VRAM, and temp module
-    Gpu,
-    /// System load average and uptime
-    Sys,
-    /// Bluetooth audio device status
-    #[command(alias = "bluetooth")]
-    Bt {
-        #[arg(default_value = "show")]
-        action: String,
-    },
-    /// Pixel Buds Pro ANC and Battery
-    Buds {
-        #[arg(default_value = "show")]
-        action: String,
-    },
-    /// System power and battery status
-    Power,
-    /// Hyprland gamemode status
-    Game,
 }
 
 fn main() {
-    tracing_subscriber::registry()
-        .with(fmt::layer().with_target(false).pretty())
-        .with(EnvFilter::from_default_env().add_directive(tracing::Level::INFO.into()))
-        .init();
-
     let cli = Cli::parse();
 
-    match &cli.command {
+    // Explicit --loglevel takes priority, then RUST_LOG env var, then a
+    // sensible default: INFO for the daemon, WARN for client commands.
+    let default_level = if let Some(level) = &cli.loglevel {
+        tracing::Level::from(level.clone())
+    } else if matches!(&cli.command, Some(Commands::Daemon { .. })) {
+        tracing::Level::INFO
+    } else {
+        tracing::Level::WARN
+    };
+
+    tracing_subscriber::registry()
+        .with(fmt::layer().with_target(false).pretty())
+        .with(EnvFilter::from_default_env().add_directive(default_level.into()))
+        .init();
+
+    if cli.help {
+        help::print_help(None);
+        return;
+    }
+
+    if let Some(command) = &cli.command {
+        match command {
             Commands::Daemon { config } => {
                 info!("Starting Fluxo daemon...");
-            if let Err(e) = daemon::run_daemon(config.clone()) {
+                let rt = tokio::runtime::Builder::new_multi_thread()
+                    .enable_all()
+                    .build()
+                    .unwrap();
+
+                if let Err(e) = rt.block_on(daemon::run_daemon(config.clone())) {
                     error!("Daemon failed: {}", e);
                     process::exit(1);
                 }
@@ -105,99 +142,16 @@ fn main() {
                     process::exit(1);
                 }
             },
-        Commands::Net => handle_ipc_response(ipc::request_data("net", &[])),
+            Commands::Help { module } => {
-        Commands::Cpu => handle_ipc_response(ipc::request_data("cpu", &[])),
+                help::print_help(module.as_deref());
-        Commands::Mem => handle_ipc_response(ipc::request_data("mem", &[])),
-        Commands::Disk { path } => handle_ipc_response(ipc::request_data("disk", &[path])),
-        Commands::Pool { kind } => handle_ipc_response(ipc::request_data("pool", &[kind])),
-        Commands::Vol { cycle } => {
-            let action = if *cycle { "cycle" } else { "show" };
-            handle_ipc_response(ipc::request_data("vol", &[action]));
             }
-        Commands::Mic { cycle } => {
-            let action = if *cycle { "cycle" } else { "show" };
-            handle_ipc_response(ipc::request_data("mic", &[action]));
-        }
-        Commands::Gpu => handle_ipc_response(ipc::request_data("gpu", &[])),
-        Commands::Sys => handle_ipc_response(ipc::request_data("sys", &[])),
-        Commands::Bt { action } => {
-            if action == "menu" {
-                // Client-side execution of the menu
-                let config = config::load_config(None);
-
-                let devices_out = match std::process::Command::new("bluetoothctl")
-                    .args(["devices"])
-                    .output()
-                {
-                    Ok(out) => out,
-                    Err(e) => {
-                        error!("bluetoothctl not found or failed: {}", e);
-                        return;
-                    }
-                };
-                let stdout = String::from_utf8_lossy(&devices_out.stdout);
-
-                let mut items = Vec::new();
-                for line in stdout.lines() {
-                    if line.starts_with("Device ") {
-                        let parts: Vec<&str> = line.splitn(3, ' ').collect();
-                        if parts.len() == 3 {
-                            items.push(format!("{} ({})", parts[2], parts[1]));
-                        }
-                    }
-                }
-
-                if !items.is_empty() {
-                    if let Ok(selected) =
-                        utils::show_menu("Connect BT: ", &items, &config.general.menu_command)
-                        && let Some(mac_start) = selected.rfind('(')
-                        && let Some(mac_end) = selected.rfind(')')
-                    {
-                        let mac = &selected[mac_start + 1..mac_end];
-                        let _ = std::process::Command::new("bluetoothctl")
-                            .args(["connect", mac])
-                            .status();
-                    }
-                } else {
-                    info!("No paired Bluetooth devices found.");
         }
         return;
     }
-            handle_ipc_response(ipc::request_data("bt", &[action]));
-        }
-        Commands::Buds { action } => handle_ipc_response(ipc::request_data("buds", &[action])),
-        Commands::Power => handle_ipc_response(ipc::request_data("power", &[])),
-        Commands::Game => handle_ipc_response(ipc::request_data("game", &[])),
-    }
-}
 
-fn handle_ipc_response(response: anyhow::Result<String>) {
+    if let Some(module) = &cli.module {
-    match response {
+        client::run_module_command(module, &cli.args);
-        Ok(json_str) => match serde_json::from_str::<serde_json::Value>(&json_str) {
-            Ok(mut val) => {
-                if let Some(text) = val.get_mut("text").and_then(|t| t.as_str()) {
-                    let processed_text = if text.contains('<') {
-                        text.to_string()
     } else {
-                        text.replace(' ', "\u{2007}")
+        help::print_help(None);
-                    };
-
-                    let fixed_text = format!("\u{200B}{}\u{200B}", processed_text);
-                    val["text"] = serde_json::Value::String(fixed_text);
-                }
-                println!("{}", serde_json::to_string(&val).unwrap());
-            }
-            Err(_) => println!("{}", json_str),
-        },
-        Err(e) => {
-            let err_out = output::WaybarOutput {
-                text: format!("\u{200B}Daemon offline ({})\u{200B}", e),
-                tooltip: Some(e.to_string()),
-                class: Some("error".to_string()),
-                percentage: None,
-            };
-            println!("{}", serde_json::to_string(&err_out).unwrap());
-            process::exit(1);
-        }
     }
 }

src/modules/audio.rs

@@ -1,56 +1,439 @@
+//! PulseAudio/PipeWire sink + source indicator with live event subscription.
+//!
+//! The daemon runs on its own OS thread because libpulse's threaded mainloop
+//! must drive callbacks inside its own lock scope. Volume/mute changes are
+//! routed back via an async [`mpsc`] channel — the module handlers [`run`]s
+//! only push commands; the thread performs the actual libpulse calls.
+
 use crate::config::Config;
+use crate::error::{FluxoError, Result};
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::{AppReceivers, AudioDeviceInfo, AudioState};
-use crate::utils::{TokenValue, format_template, run_command};
+use crate::utils::{TokenValue, format_template};
-use anyhow::{Result, anyhow};
+use libpulse_binding::callbacks::ListResult;
-use std::process::Command;
+use libpulse_binding::context::subscribe::{Facility, InterestMaskSet};
+use libpulse_binding::context::{Context, FlagSet as ContextFlag};
+use libpulse_binding::mainloop::threaded::Mainloop as ThreadedMainloop;
+use libpulse_binding::volume::Volume;
+use std::sync::Arc;
+use tokio::sync::{mpsc, watch};
+use tracing::error;
 
+/// Commands the module handler sends to the audio daemon thread.
+pub enum AudioCommand {
+    ChangeVolume {
+        is_sink: bool,
+        step_val: u32,
+        is_up: bool,
+    },
+    ToggleMute {
+        is_sink: bool,
+    },
+    CycleDevice {
+        is_sink: bool,
+    },
+}
+
+/// Long-lived daemon driving libpulse's threaded mainloop.
+pub struct AudioDaemon;
+
+impl AudioDaemon {
+    /// Construct a new (stateless) daemon.
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Spawn the audio thread, subscribe to sink/source/server events, and
+    /// start consuming [`AudioCommand`]s.
+    pub fn start(
+        &self,
+        state_tx: &watch::Sender<AudioState>,
+        mut cmd_rx: mpsc::Receiver<AudioCommand>,
+    ) {
+        let state_tx = state_tx.clone();
+
+        std::thread::spawn(move || {
+            let mut mainloop =
+                ThreadedMainloop::new().expect("Failed to create pulse threaded mainloop");
+
+            let mut context =
+                Context::new(&mainloop, "fluxo").expect("Failed to create pulse context");
+
+            context
+                .connect(None, ContextFlag::NOFLAGS, None)
+                .expect("Failed to connect pulse context");
+
+            mainloop.start().expect("Failed to start pulse mainloop");
+
+            mainloop.lock();
+
+            loop {
+                match context.get_state() {
+                    libpulse_binding::context::State::Ready => break,
+                    libpulse_binding::context::State::Failed
+                    | libpulse_binding::context::State::Terminated => {
+                        error!("Pulse context failed or terminated");
+                        mainloop.unlock();
+                        return;
+                    }
+                    _ => {
+                        mainloop.unlock();
+                        std::thread::sleep(Duration::from_millis(50));
+                        mainloop.lock();
+                    }
+                }
+            }
+
+            let _ = fetch_audio_data_sync(&mut context, &state_tx);
+
+            let interest =
+                InterestMaskSet::SINK | InterestMaskSet::SOURCE | InterestMaskSet::SERVER;
+            context.subscribe(interest, |_| {});
+
+            let (tx, rx) = std::sync::mpsc::channel();
+            let tx_cb = tx.clone();
+
+            context.set_subscribe_callback(Some(Box::new(move |facility, _operation, _index| {
+                match facility {
+                    Some(Facility::Sink) | Some(Facility::Source) | Some(Facility::Server) => {
+                        let _ = tx_cb.send(());
+                    }
+                    _ => {}
+                }
+            })));
+
+            mainloop.unlock();
+
+            loop {
+                if let Ok(cmd) = cmd_rx.try_recv() {
+                    mainloop.lock();
+                    match cmd {
+                        AudioCommand::ChangeVolume {
+                            is_sink,
+                            step_val,
+                            is_up,
+                        } => {
+                            let current = state_tx.borrow().clone();
+                            let (name, mut vol, channels) = if is_sink {
+                                (
+                                    current.sink.name.clone(),
+                                    current.sink.volume,
+                                    current.sink.channels,
+                                )
+                            } else {
+                                (
+                                    current.source.name.clone(),
+                                    current.source.volume,
+                                    current.source.channels,
+                                )
+                            };
+
+                            if is_up {
+                                vol = vol.saturating_add(step_val as u8).min(150);
+                            } else {
+                                vol = vol.saturating_sub(step_val as u8);
+                            }
+
+                            let pulse_vol = Volume(
+                                (vol as f64 / 100.0 * Volume::NORMAL.0 as f64).round() as u32,
+                            );
+                            let mut cvol = libpulse_binding::volume::ChannelVolumes::default();
+                            cvol.set(channels.max(1), pulse_vol);
+
+                            if is_sink {
+                                context
+                                    .introspect()
+                                    .set_sink_volume_by_name(&name, &cvol, None);
+                            } else {
+                                context
+                                    .introspect()
+                                    .set_source_volume_by_name(&name, &cvol, None);
+                            }
+                        }
+                        AudioCommand::ToggleMute { is_sink } => {
+                            let current = state_tx.borrow().clone();
+                            let (name, muted) = if is_sink {
+                                (current.sink.name.clone(), current.sink.muted)
+                            } else {
+                                (current.source.name.clone(), current.source.muted)
+                            };
+
+                            if is_sink {
+                                context
+                                    .introspect()
+                                    .set_sink_mute_by_name(&name, !muted, None);
+                            } else {
+                                context
+                                    .introspect()
+                                    .set_source_mute_by_name(&name, !muted, None);
+                            }
+                        }
+                        AudioCommand::CycleDevice { is_sink } => {
+                            let current = state_tx.borrow().clone();
+                            let current_name = if is_sink {
+                                current.sink.name.clone()
+                            } else {
+                                current.source.name.clone()
+                            };
+
+                            let devices = if is_sink {
+                                &current.available_sinks
+                            } else {
+                                &current.available_sources
+                            };
+                            if !devices.is_empty() {
+                                let current_idx =
+                                    devices.iter().position(|d| d == &current_name).unwrap_or(0);
+                                let next_idx = (current_idx + 1) % devices.len();
+                                let next_dev = &devices[next_idx];
+
+                                if is_sink {
+                                    context.set_default_sink(next_dev, |_| {});
+                                } else {
+                                    context.set_default_source(next_dev, |_| {});
+                                }
+                            }
+                        }
+                    }
+                    mainloop.unlock();
+                    let _ = tx.send(());
+                }
+
+                let _ = rx.recv_timeout(Duration::from_millis(50));
+                while rx.try_recv().is_ok() {}
+
+                mainloop.lock();
+
+                let _ = fetch_audio_data_sync(&mut context, &state_tx);
+
+                mainloop.unlock();
+            }
+        });
+    }
+}
+
+use std::time::Duration;
+
+/// Trigger async libpulse introspection: server defaults + sink/source lists.
+/// Callbacks publish onto `state_tx` as results land.
+fn fetch_audio_data_sync(
+    context: &mut Context,
+    state_tx: &watch::Sender<AudioState>,
+) -> Result<()> {
+    let tx_server = state_tx.clone();
+    context.introspect().get_server_info(move |info| {
+        let mut current = tx_server.borrow().clone();
+        current.sink.name = info
+            .default_sink_name
+            .as_ref()
+            .map(|s| s.to_string())
+            .unwrap_or_default();
+        current.source.name = info
+            .default_source_name
+            .as_ref()
+            .map(|s| s.to_string())
+            .unwrap_or_default();
+        let _ = tx_server.send(current);
+    });
+
+    fetch_sinks(context, state_tx);
+    fetch_sources(context, state_tx);
+
+    Ok(())
+}
+
+/// Shared bookkeeping for a device list fetch.
+struct PendingList {
+    names: Arc<std::sync::Mutex<Vec<String>>>,
+}
+
+impl PendingList {
+    fn new() -> Self {
+        Self {
+            names: Arc::new(std::sync::Mutex::new(Vec::new())),
+        }
+    }
+
+    fn push(&self, name: String) {
+        self.names.lock().unwrap().push(name);
+    }
+
+    fn drain(&self) -> Vec<String> {
+        self.names.lock().unwrap().drain(..).collect()
+    }
+}
+
+/// Extract common device info from a pulse item's volume/mute/description fields.
+fn device_info_from(
+    description: Option<&str>,
+    volume: &libpulse_binding::volume::ChannelVolumes,
+    muted: bool,
+) -> (String, u8, bool, u8) {
+    let desc = description.unwrap_or_default().to_string();
+    let vol = ((volume.avg().0 as f64 / Volume::NORMAL.0 as f64) * 100.0).round() as u8;
+    let channels = volume.len();
+    (desc, vol, muted, channels)
+}
+
+/// Write `info` into `target` only when `item_name` matches the currently
+/// selected default device — other sinks/sources are ignored here.
+fn apply_device_info(target: &mut AudioDeviceInfo, item_name: &str, info: (String, u8, bool, u8)) {
+    if item_name == target.name {
+        target.description = info.0;
+        target.volume = info.1;
+        target.muted = info.2;
+        target.channels = info.3;
+    }
+}
+
+/// Dispatch `get_sink_info_list` and collect names into `available_sinks`.
+fn fetch_sinks(context: &mut Context, state_tx: &watch::Sender<AudioState>) {
+    let tx = state_tx.clone();
+    let pending = PendingList::new();
+    let pending_cb = PendingList {
+        names: Arc::clone(&pending.names),
+    };
+    context.introspect().get_sink_info_list(move |res| {
+        let mut current = tx.borrow().clone();
+        match res {
+            ListResult::Item(item) => {
+                let name_str = item
+                    .name
+                    .as_ref()
+                    .map(|s| s.to_string())
+                    .unwrap_or_default();
+                if !name_str.is_empty() {
+                    pending_cb.push(name_str.clone());
+                }
+                let info = device_info_from(
+                    item.description.as_ref().map(|s| s.as_ref()),
+                    &item.volume,
+                    item.mute,
+                );
+                apply_device_info(&mut current.sink, &name_str, info);
+                let _ = tx.send(current);
+            }
+            ListResult::End => {
+                current.available_sinks = pending_cb.drain();
+                let _ = tx.send(current);
+            }
+            ListResult::Error => {}
+        }
+    });
+}
+
+/// Dispatch `get_source_info_list` and collect names (skipping `.monitor`
+/// virtual sources) into `available_sources`.
+fn fetch_sources(context: &mut Context, state_tx: &watch::Sender<AudioState>) {
+    let tx = state_tx.clone();
+    let pending = PendingList::new();
+    let pending_cb = PendingList {
+        names: Arc::clone(&pending.names),
+    };
+    context.introspect().get_source_info_list(move |res| {
+        let mut current = tx.borrow().clone();
+        match res {
+            ListResult::Item(item) => {
+                let name_str = item
+                    .name
+                    .as_ref()
+                    .map(|s| s.to_string())
+                    .unwrap_or_default();
+                if !name_str.is_empty() && !name_str.contains(".monitor") {
+                    pending_cb.push(name_str.clone());
+                }
+                let info = device_info_from(
+                    item.description.as_ref().map(|s| s.as_ref()),
+                    &item.volume,
+                    item.mute,
+                );
+                apply_device_info(&mut current.source, &name_str, info);
+                let _ = tx.send(current);
+            }
+            ListResult::End => {
+                current.available_sources = pending_cb.drain();
+                let _ = tx.send(current);
+            }
+            ListResult::Error => {}
+        }
+    });
+}
+
+/// Renders sink/source + dispatches volume/mute/cycle commands.
+/// Args: `[sink|source] [show|up|down|mute|cycle] [step]`.
 pub struct AudioModule;
 
 impl WaybarModule for AudioModule {
-    fn run(&self, config: &Config, _state: &SharedState, args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        args: &[&str],
+    ) -> Result<WaybarOutput> {
         let target_type = args.first().unwrap_or(&"sink");
         let action = args.get(1).unwrap_or(&"show");
+        let step = args.get(2).unwrap_or(&"5");
 
         match *action {
-            "cycle" => {
+            "up" => {
-                self.cycle_device(target_type)?;
+                self.change_volume(state, target_type, step, true).await?;
-                Ok(WaybarOutput {
+                self.get_status(config, state, target_type).await
-                    text: String::new(),
-                    tooltip: None,
-                    class: None,
-                    percentage: None,
-                })
             }
-            "show" => self.get_status(config, target_type),
+            "down" => {
-            other => Err(anyhow!("Unknown audio action: '{}'", other)),
+                self.change_volume(state, target_type, step, false).await?;
+                self.get_status(config, state, target_type).await
+            }
+            "mute" => {
+                self.toggle_mute(state, target_type).await?;
+                self.get_status(config, state, target_type).await
+            }
+            "cycle" => {
+                self.cycle_device(state, target_type).await?;
+                self.get_status(config, state, target_type).await
+            }
+            "show" => self.get_status(config, state, target_type).await,
+            other => Err(FluxoError::Module {
+                module: "audio",
+                message: format!("Unknown audio action: '{}'", other),
+            }),
         }
     }
 }
 
 impl AudioModule {
-    fn get_status(&self, config: &Config, target_type: &str) -> Result<WaybarOutput> {
+    async fn get_status(
-        let target = if target_type == "sink" {
+        &self,
-            "@DEFAULT_AUDIO_SINK@"
+        config: &Config,
+        state: &AppReceivers,
+        target_type: &str,
+    ) -> Result<WaybarOutput> {
+        let audio_state = state.audio.borrow().clone();
+
+        let (name, description, volume, muted) = if target_type == "sink" {
+            (
+                audio_state.sink.name,
+                audio_state.sink.description,
+                audio_state.sink.volume,
+                audio_state.sink.muted,
+            )
         } else {
-            "@DEFAULT_AUDIO_SOURCE@"
+            (
+                audio_state.source.name,
+                audio_state.source.description,
+                audio_state.source.volume,
+                audio_state.source.muted,
+            )
         };
 
-        let stdout = run_command("wpctl", &["get-volume", target])?;
+        if name.is_empty() {
-
+            return Ok(WaybarOutput {
-        let parts: Vec<&str> = stdout.split_whitespace().collect();
+                text: "Audio Loading...".to_string(),
-        if parts.len() < 2 {
+                ..Default::default()
-            return Err(anyhow!("Could not parse wpctl output: {}", stdout));
+            });
         }
 
-        let vol_val: f64 = parts[1].parse().unwrap_or(0.0);
+        let display_name = if description.len() > 20 {
-        let vol = (vol_val * 100.0).round() as u8;
-        let display_vol = std::cmp::min(vol, 100);
-        let muted = stdout.contains("[MUTED]");
-
-        let description = self.get_description(target_type)?;
-        let name = if description.len() > 20 {
             format!("{}...", &description[..17])
         } else {
             description.clone()
@@ -66,16 +449,16 @@ impl AudioModule {
             let t = format_template(
                 format_str,
                 &[
-                    ("name", TokenValue::String(&name)),
+                    ("name", TokenValue::String(display_name)),
-                    ("icon", TokenValue::String(icon)),
+                    ("icon", TokenValue::String(icon.to_string())),
                 ],
             );
             (t, "muted")
         } else {
             let icon = if target_type == "sink" {
-                if display_vol <= 30 {
+                if volume <= 30 {
                     ""
-                } else if display_vol <= 60 {
+                } else if volume <= 60 {
                     ""
                 } else {
                     ""
@@ -91,9 +474,9 @@ impl AudioModule {
             let t = format_template(
                 format_str,
                 &[
-                    ("name", TokenValue::String(&name)),
+                    ("name", TokenValue::String(display_name)),
-                    ("icon", TokenValue::String(icon)),
+                    ("icon", TokenValue::String(icon.to_string())),
-                    ("volume", TokenValue::Int(display_vol as i64)),
+                    ("volume", TokenValue::Int(volume as i64)),
                 ],
             );
             (t, "unmuted")
@@ -103,99 +486,45 @@ impl AudioModule {
             text,
             tooltip: Some(description),
             class: Some(class.to_string()),
-            percentage: Some(display_vol),
+            percentage: Some(volume),
         })
     }
 
-    fn get_description(&self, target_type: &str) -> Result<String> {
+    async fn change_volume(
-        let info_stdout = run_command("pactl", &["info"])?;
+        &self,
-        let search_key = if target_type == "sink" {
+        state: &AppReceivers,
-            "Default Sink:"
+        target_type: &str,
-        } else {
+        step: &str,
-            "Default Source:"
+        is_up: bool,
-        };
+    ) -> Result<()> {
-
+        let is_sink = target_type == "sink";
-        let default_dev = info_stdout
+        let step_val: u32 = step.parse().unwrap_or(5);
-            .lines()
+        let _ = state
-            .find(|l| l.contains(search_key))
+            .audio_cmd_tx
-            .and_then(|l| l.split(':').nth(1))
+            .send(AudioCommand::ChangeVolume {
-            .map(|s| s.trim())
+                is_sink,
-            .ok_or_else(|| anyhow!("Default {} not found", target_type))?;
+                step_val,
-
+                is_up,
-        let list_cmd = if target_type == "sink" {
-            "sinks"
-        } else {
-            "sources"
-        };
-        let list_stdout = run_command("pactl", &["list", list_cmd])?;
-
-        let mut current_name = String::new();
-        for line in list_stdout.lines() {
-            if line.trim().starts_with("Name: ") {
-                current_name = line.split(':').nth(1).unwrap_or("").trim().to_string();
-            }
-            if current_name == default_dev && line.trim().starts_with("Description: ") {
-                return Ok(line.split(':').nth(1).unwrap_or("").trim().to_string());
-            }
-        }
-
-        Ok(default_dev.to_string())
-    }
-
-    fn cycle_device(&self, target_type: &str) -> Result<()> {
-        let list_cmd = if target_type == "sink" {
-            "sinks"
-        } else {
-            "sources"
-        };
-        let stdout = run_command("pactl", &["list", "short", list_cmd])?;
-
-        let devices: Vec<String> = stdout
-            .lines()
-            .filter_map(|l| {
-                let parts: Vec<&str> = l.split_whitespace().collect();
-                if parts.len() >= 2 {
-                    let name = parts[1].to_string();
-                    if target_type == "source" && name.contains(".monitor") {
-                        None
-                    } else {
-                        Some(name)
-                    }
-                } else {
-                    None
-                }
             })
-            .collect();
+            .await;
-
+        Ok(())
-        if devices.is_empty() {
-            return Ok(());
     }
 
-        let info_stdout = run_command("pactl", &["info"])?;
+    async fn toggle_mute(&self, state: &AppReceivers, target_type: &str) -> Result<()> {
-        let search_key = if target_type == "sink" {
+        let is_sink = target_type == "sink";
-            "Default Sink:"
+        let _ = state
-        } else {
+            .audio_cmd_tx
-            "Default Source:"
+            .send(AudioCommand::ToggleMute { is_sink })
-        };
+            .await;
-
+        Ok(())
-        let current_dev = info_stdout
+    }
-            .lines()
-            .find(|l| l.contains(search_key))
-            .and_then(|l| l.split(':').nth(1))
-            .map(|s| s.trim())
-            .unwrap_or("");
-
-        let current_index = devices.iter().position(|d| d == current_dev).unwrap_or(0);
-        let next_index = (current_index + 1) % devices.len();
-        let next_dev = &devices[next_index];
-
-        let set_cmd = if target_type == "sink" {
-            "set-default-sink"
-        } else {
-            "set-default-source"
-        };
-        Command::new("pactl").args([set_cmd, next_dev]).status()?;
 
+    async fn cycle_device(&self, state: &AppReceivers, target_type: &str) -> Result<()> {
+        let is_sink = target_type == "sink";
+        let _ = state
+            .audio_cmd_tx
+            .send(AudioCommand::CycleDevice { is_sink })
+            .await;
         Ok(())
     }
 }

src/modules/backlight.rs

@@ -0,0 +1,159 @@
+//! Screen backlight indicator, driven by `inotify` on
+//! `/sys/class/backlight/*/actual_brightness`. Falls back to a 5 s poll loop
+//! to catch any missed events.
+
+use crate::config::Config;
+use crate::error::Result;
+use crate::modules::WaybarModule;
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, BacklightState};
+use crate::utils::{TokenValue, format_template};
+use notify::{Config as NotifyConfig, Event, RecommendedWatcher, RecursiveMode, Watcher};
+use std::path::PathBuf;
+use std::sync::mpsc;
+use std::time::Duration;
+use tokio::sync::watch;
+use tracing::{error, info};
+
+/// Renders the brightness percentage with a vendor-agnostic icon bucket.
+pub struct BacklightModule;
+
+impl WaybarModule for BacklightModule {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let percentage = state.backlight.borrow().percentage;
+
+        let icon = if percentage < 30 {
+            "󰃞"
+        } else if percentage < 70 {
+            "󰃟"
+        } else {
+            "󰃠"
+        };
+
+        let text = format_template(
+            &config.backlight.format,
+            &[
+                ("percentage", TokenValue::Int(percentage as i64)),
+                ("icon", TokenValue::String(icon.to_string())),
+            ],
+        );
+
+        Ok(WaybarOutput {
+            text,
+            tooltip: Some(format!("Brightness: {}%", percentage)),
+            class: Some("normal".to_string()),
+            percentage: Some(percentage),
+        })
+    }
+}
+
+/// Background `inotify` watcher thread for the sysfs backlight file.
+pub struct BacklightDaemon;
+
+impl BacklightDaemon {
+    /// Construct a new (stateless) daemon.
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Spawn an OS thread that publishes brightness changes onto `tx`.
+    pub fn start(&self, tx: watch::Sender<BacklightState>) {
+        std::thread::spawn(move || {
+            let base_dir = PathBuf::from("/sys/class/backlight");
+            let mut device_dir = None;
+
+            if let Ok(entries) = std::fs::read_dir(&base_dir) {
+                for entry in entries.flatten() {
+                    let path = entry.path();
+                    if path.is_dir() {
+                        device_dir = Some(path);
+                        break;
+                    }
+                }
+            }
+
+            let Some(dir) = device_dir else {
+                error!("No backlight device found in /sys/class/backlight");
+                return;
+            };
+
+            info!("Monitoring backlight device: {:?}", dir);
+
+            let max_brightness_path = dir.join("max_brightness");
+            let brightness_path = dir.join("actual_brightness");
+            let brightness_path_fallback = dir.join("brightness");
+
+            let target_file = if brightness_path.exists() {
+                brightness_path
+            } else {
+                brightness_path_fallback
+            };
+
+            let get_percentage = || -> u8 {
+                let max: f64 = std::fs::read_to_string(&max_brightness_path)
+                    .unwrap_or_default()
+                    .trim()
+                    .parse()
+                    .unwrap_or(100.0);
+                let current: f64 = std::fs::read_to_string(&target_file)
+                    .unwrap_or_default()
+                    .trim()
+                    .parse()
+                    .unwrap_or(0.0);
+
+                if max > 0.0 {
+                    ((current / max) * 100.0).round() as u8
+                } else {
+                    0
+                }
+            };
+
+            let _ = tx.send(BacklightState {
+                percentage: get_percentage(),
+            });
+
+            let (ev_tx, ev_rx) = mpsc::channel();
+            let mut watcher = RecommendedWatcher::new(
+                move |res: notify::Result<Event>| {
+                    if let Ok(event) = res
+                        && event.kind.is_modify()
+                    {
+                        let _ = ev_tx.send(());
+                    }
+                },
+                NotifyConfig::default(),
+            )
+            .unwrap();
+
+            if let Err(e) = watcher.watch(&target_file, RecursiveMode::NonRecursive) {
+                error!("Failed to watch backlight file: {}", e);
+                return;
+            }
+
+            loop {
+                if ev_rx.recv_timeout(Duration::from_secs(5)).is_ok() {
+                    // Debounce bursts from scroll-driven brightness changes.
+                    std::thread::sleep(Duration::from_millis(50));
+                    while ev_rx.try_recv().is_ok() {}
+
+                    let _ = tx.send(BacklightState {
+                        percentage: get_percentage(),
+                    });
+                } else {
+                    // Timeout reached — resync in case an event was missed.
+                    let current = get_percentage();
+                    if tx.borrow().percentage != current {
+                        let _ = tx.send(BacklightState {
+                            percentage: current,
+                        });
+                    }
+                }
+            }
+        });
+    }
+}

src/modules/bt.rs

@@ -1,116 +0,0 @@
-use crate::config::Config;
-use crate::modules::WaybarModule;
-use crate::output::WaybarOutput;
-use crate::state::SharedState;
-use crate::utils::{TokenValue, format_template, run_command};
-use anyhow::Result;
-use std::process::Command;
-
-pub struct BtModule;
-
-impl WaybarModule for BtModule {
-    fn run(&self, config: &Config, _state: &SharedState, args: &[&str]) -> Result<WaybarOutput> {
-        let action = args.first().unwrap_or(&"show");
-
-        if *action == "disconnect" {
-            if let Some(mac) = find_audio_device() {
-                let _ = Command::new("bluetoothctl")
-                    .args(["disconnect", &mac])
-                    .output();
-            }
-            return Ok(WaybarOutput {
-                text: String::new(),
-                tooltip: None,
-                class: None,
-                percentage: None,
-            });
-        }
-
-        if let Ok(stdout) = run_command("bluetoothctl", &["show"])
-            && stdout.contains("Powered: no") {
-                return Ok(WaybarOutput {
-                    text: config.bt.format_disabled.clone(),
-                    tooltip: Some("Bluetooth Disabled".to_string()),
-                    class: Some("disabled".to_string()),
-                    percentage: None,
-                });
-            }
-
-        if let Some(mac) = find_audio_device() {
-            let info = run_command("bluetoothctl", &["info", &mac])?;
-
-            let mut alias = mac.clone();
-            let mut battery = None;
-            let mut trusted = "no";
-
-            for line in info.lines() {
-                if line.contains("Alias:") {
-                    alias = line.split("Alias:").nth(1).unwrap_or("").trim().to_string();
-                } else if line.contains("Battery Percentage:") {
-                    if let Some(bat_str) = line.split('(').nth(1).and_then(|s| s.split(')').next())
-                    {
-                        battery = bat_str.parse::<u8>().ok();
-                    }
-                } else if line.contains("Trusted: yes") {
-                    trusted = "yes";
-                }
-            }
-
-            let tooltip = format!(
-                "{} | MAC: {}\nTrusted: {} | Bat: {}",
-                alias,
-                mac,
-                trusted,
-                battery
-                    .map(|b| format!("{}%", b))
-                    .unwrap_or_else(|| "N/A".to_string())
-            );
-
-            let text = format_template(
-                &config.bt.format_connected,
-                &[("alias", TokenValue::String(&alias))],
-            );
-
-            Ok(WaybarOutput {
-                text,
-                tooltip: Some(tooltip),
-                class: Some("connected".to_string()),
-                percentage: battery,
-            })
-        } else {
-            Ok(WaybarOutput {
-                text: config.bt.format_disconnected.clone(),
-                tooltip: Some("Bluetooth On (Disconnected)".to_string()),
-                class: Some("disconnected".to_string()),
-                percentage: None,
-            })
-        }
-    }
-}
-
-fn find_audio_device() -> Option<String> {
-    if let Ok(sink) = run_command("pactl", &["get-default-sink"])
-        && sink.starts_with("bluez_output.") {
-            let parts: Vec<&str> = sink.split('.').collect();
-            if parts.len() >= 2 {
-                return Some(parts[1].replace('_', ":"));
-            }
-        }
-
-    if let Ok(stdout) = run_command("bluetoothctl", &["devices", "Connected"]) {
-        for line in stdout.lines() {
-            if line.starts_with("Device ") {
-                let parts: Vec<&str> = line.split_whitespace().collect();
-                if parts.len() >= 2 {
-                    let mac = parts[1];
-                    if let Ok(info_str) = run_command("bluetoothctl", &["info", mac])
-                        && info_str.contains("0000110b-0000-1000-8000-00805f9b34fb") {
-                            return Some(mac.to_string());
-                        }
-                }
-            }
-        }
-    }
-
-    None
-}

src/modules/bt/buds.rs

@@ -0,0 +1,153 @@
+//! Per-device BT plugin trait + PixelBuds Pro implementation on top of the
+//! Maestro GATT connection.
+
+use crate::config::Config;
+use crate::error::{FluxoError, Result as FluxoResult};
+use crate::modules::bt::maestro::BudsCommand;
+use crate::state::AppReceivers;
+use crate::utils::TokenValue;
+use futures::future::BoxFuture;
+
+/// A device-specific adapter that can enrich [`BtState`](crate::state::BtState)
+/// with extra metadata and expose control actions (modes).
+pub trait BtPlugin: Send + Sync {
+    /// Plugin identifier used for logging.
+    fn name(&self) -> &str;
+    /// Return true if this plugin handles a device with `alias`/`mac`.
+    fn can_handle(&self, alias: &str, mac: &str) -> bool;
+    /// Return `(token_name, value)` pairs merged into the rendered template.
+    fn get_data(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        mac: &str,
+    ) -> BoxFuture<'static, FluxoResult<Vec<(String, TokenValue)>>>;
+    /// List of mode identifiers the plugin can switch between.
+    fn get_modes(
+        &self,
+        mac: &str,
+        state: &AppReceivers,
+    ) -> BoxFuture<'static, FluxoResult<Vec<String>>>;
+    /// Switch device to `mode` (must be one returned by `get_modes`).
+    fn set_mode(
+        &self,
+        mode: &str,
+        mac: &str,
+        state: &AppReceivers,
+    ) -> BoxFuture<'static, FluxoResult<()>>;
+    /// Advance to the next mode in the list (wraps around).
+    fn cycle_mode(&self, mac: &str, state: &AppReceivers) -> BoxFuture<'static, FluxoResult<()>>;
+}
+
+/// Google Pixel Buds Pro plugin. Reads battery + ANC state via Maestro GATT.
+pub struct PixelBudsPlugin;
+
+impl BtPlugin for PixelBudsPlugin {
+    fn name(&self) -> &str {
+        "Pixel Buds Pro"
+    }
+
+    fn can_handle(&self, alias: &str, _mac: &str) -> bool {
+        alias.contains("Pixel Buds Pro")
+    }
+
+    fn get_data(
+        &self,
+        _config: &Config,
+        state: &AppReceivers,
+        mac: &str,
+    ) -> BoxFuture<'static, FluxoResult<Vec<(String, TokenValue)>>> {
+        let mac = mac.to_string();
+        let state = state.clone();
+        Box::pin(async move {
+            let maestro = crate::modules::bt::maestro::get_maestro(&state);
+            maestro.ensure_task(&mac);
+            let status = maestro.get_status(&mac);
+
+            if let Some(err) = status.error {
+                return Err(FluxoError::Module {
+                    module: "bt.buds",
+                    message: err,
+                });
+            }
+
+            let left_display = status
+                .left_battery
+                .map(|b| format!("{}%", b))
+                .unwrap_or_else(|| "---".to_string());
+            let right_display = status
+                .right_battery
+                .map(|b| format!("{}%", b))
+                .unwrap_or_else(|| "---".to_string());
+
+            let (anc_icon, class) = match status.anc_state.as_str() {
+                "active" => ("ANC", "anc-active"),
+                "aware" => ("Aware", "anc-aware"),
+                "off" => ("Off", "anc-off"),
+                _ => ("?", "anc-unknown"),
+            };
+
+            Ok(vec![
+                ("left".to_string(), TokenValue::String(left_display)),
+                ("right".to_string(), TokenValue::String(right_display)),
+                ("anc".to_string(), TokenValue::String(anc_icon.to_string())),
+                (
+                    "plugin_class".to_string(),
+                    TokenValue::String(class.to_string()),
+                ),
+            ])
+        })
+    }
+
+    fn get_modes(
+        &self,
+        _mac: &str,
+        _state: &AppReceivers,
+    ) -> BoxFuture<'static, FluxoResult<Vec<String>>> {
+        Box::pin(async move {
+            Ok(vec![
+                "active".to_string(),
+                "aware".to_string(),
+                "off".to_string(),
+            ])
+        })
+    }
+
+    fn set_mode(
+        &self,
+        mode: &str,
+        mac: &str,
+        state: &AppReceivers,
+    ) -> BoxFuture<'static, FluxoResult<()>> {
+        let mode = mode.to_string();
+        let mac = mac.to_string();
+        let state = state.clone();
+        Box::pin(async move {
+            crate::modules::bt::maestro::get_maestro(&state)
+                .send_command(&mac, BudsCommand::SetAnc(mode))
+                .map_err(|e: anyhow::Error| FluxoError::Module {
+                    module: "bt.buds",
+                    message: e.to_string(),
+                })
+        })
+    }
+
+    fn cycle_mode(&self, mac: &str, state: &AppReceivers) -> BoxFuture<'static, FluxoResult<()>> {
+        let mac = mac.to_string();
+        let state = state.clone();
+        Box::pin(async move {
+            let status = crate::modules::bt::maestro::get_maestro(&state).get_status(&mac);
+            let next_mode = match status.anc_state.as_str() {
+                "active" => "aware",
+                "aware" => "off",
+                _ => "active",
+            };
+            crate::modules::bt::maestro::get_maestro(&state)
+                .send_command(&mac, BudsCommand::SetAnc(next_mode.to_string()))
+                .map_err(|e: anyhow::Error| FluxoError::Module {
+                    module: "bt.buds",
+                    message: e.to_string(),
+                })
+        })
+    }
+}

src/modules/bt/maestro.rs

@@ -0,0 +1,382 @@
+//! Google Maestro (PixelBuds GATT) integration.
+//!
+//! Each connected device gets its own [`buds_task`] running on a dedicated
+//! single-threaded runtime. The task opens an RFCOMM channel, speaks the
+//! Maestro protocol to read battery + ANC state, and listens for settings
+//! changes. External callers interact via [`MaestroManager::send_command`]
+//! and [`MaestroManager::get_status`].
+
+use crate::state::AppReceivers;
+use anyhow::{Context, Result};
+use futures::StreamExt;
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex, OnceLock};
+use std::time::{Duration, Instant};
+use tokio::sync::mpsc;
+use tracing::{debug, error, info, warn};
+
+use maestro::protocol::codec::Codec;
+use maestro::pwrpc::client::Client;
+use maestro::service::MaestroService;
+use maestro::service::settings::{self, SettingValue};
+
+/// Cached per-device snapshot returned to BT plugin consumers.
+#[derive(Clone, Default)]
+pub struct BudsStatus {
+    pub left_battery: Option<u8>,
+    pub right_battery: Option<u8>,
+    pub case_battery: Option<u8>,
+    pub anc_state: String,
+    #[allow(dead_code)]
+    pub last_update: Option<Instant>,
+    pub error: Option<String>,
+}
+
+/// Command that can be issued against a connected buds device.
+pub enum BudsCommand {
+    /// Set the ANC mode: `active`, `aware`, or `off`.
+    SetAnc(String),
+}
+
+/// Messages sent to the [`MaestroManager`] control thread.
+pub enum ManagerCommand {
+    /// Ensure a [`buds_task`] is running for `mac`; spawn if absent.
+    EnsureTask(String),
+    /// Forward a [`BudsCommand`] to the task for `mac`.
+    SendCommand(String, BudsCommand),
+}
+
+/// Owns all buds-task lifetimes and a shared status cache.
+pub struct MaestroManager {
+    statuses: Arc<Mutex<HashMap<String, BudsStatus>>>,
+    management_tx: mpsc::UnboundedSender<ManagerCommand>,
+}
+
+impl MaestroManager {
+    /// Spawn the management thread + runtime and return a handle.
+    pub fn new(state: AppReceivers) -> Self {
+        let (tx, mut rx) = mpsc::unbounded_channel::<ManagerCommand>();
+        let statuses = Arc::new(Mutex::new(HashMap::new()));
+        let statuses_clone = Arc::clone(&statuses);
+        let state_clone = state.clone();
+
+        // Dedicated thread — bluer uses per-thread local tasks.
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build()
+                .unwrap();
+
+            let local = tokio::task::LocalSet::new();
+
+            local.block_on(&rt, async move {
+                let mut command_txs: HashMap<String, mpsc::Sender<BudsCommand>> = HashMap::new();
+
+                loop {
+                    tokio::select! {
+                        Some(cmd) = rx.recv() => {
+                            match cmd {
+                                ManagerCommand::EnsureTask(mac) => {
+                                    if !command_txs.contains_key(&mac) {
+                                        let (tx, buds_rx) = mpsc::channel::<BudsCommand>(10);
+                                        command_txs.insert(mac.clone(), tx);
+
+                                        let mac_clone = mac.clone();
+                                        let st_clone = Arc::clone(&statuses_clone);
+                                        let state_inner = state_clone.clone();
+
+                                        tokio::task::spawn_local(async move {
+                                            if let Err(e) = buds_task(&mac_clone, st_clone, buds_rx, state_inner).await {
+                                                error!("Buds task for {} failed: {}", mac_clone, e);
+                                            }
+                                        });
+                                    }
+                                }
+                                ManagerCommand::SendCommand(mac, buds_cmd) => {
+                                    if let Some(tx) = command_txs.get(&mac) {
+                                        let _ = tx.try_send(buds_cmd);
+                                    }
+                                }
+                            }
+                        }
+                        _ = tokio::time::sleep(Duration::from_millis(100)) => {
+                            // Wake tick: future hook for task-lifecycle cleanup.
+                        }
+                    }
+                }
+            });
+        });
+
+        Self {
+            statuses,
+            management_tx: tx,
+        }
+    }
+
+    /// Return the cached [`BudsStatus`] for `mac` (default if absent).
+    pub fn get_status(&self, mac: &str) -> BudsStatus {
+        let statuses = self.statuses.lock().unwrap();
+        statuses.get(mac).cloned().unwrap_or_default()
+    }
+
+    /// Request that a buds task be running for `mac`. Idempotent.
+    pub fn ensure_task(&self, mac: &str) {
+        let _ = self
+            .management_tx
+            .send(ManagerCommand::EnsureTask(mac.to_string()));
+    }
+
+    /// Ensure a task exists and forward `cmd` to it.
+    pub fn send_command(&self, mac: &str, cmd: BudsCommand) -> Result<()> {
+        self.ensure_task(mac);
+        let _ = self
+            .management_tx
+            .send(ManagerCommand::SendCommand(mac.to_string(), cmd));
+        Ok(())
+    }
+}
+
+/// Per-device async task: opens RFCOMM, runs the Maestro codec, mirrors
+/// battery/ANC state into the shared status map, and consumes commands.
+async fn buds_task(
+    mac: &str,
+    statuses: Arc<Mutex<HashMap<String, BudsStatus>>>,
+    mut rx: mpsc::Receiver<BudsCommand>,
+    state: AppReceivers,
+) -> Result<()> {
+    info!("Starting native Maestro connection task for {}", mac);
+
+    loop {
+        let addr: bluer::Address = match mac.parse() {
+            Ok(a) => a,
+            Err(e) => {
+                error!("Failed to parse MAC address {}: {}", mac, e);
+                return Err(e.into());
+            }
+        };
+        let session = bluer::Session::new()
+            .await
+            .context("Failed to create bluer session")?;
+        let adapter = session
+            .default_adapter()
+            .await
+            .context("Failed to get default adapter")?;
+        let device = adapter
+            .device(addr)
+            .context("Failed to get device handle")?;
+
+        if !device.is_connected().await.unwrap_or(false) {
+            debug!("Device {} not connected to BT, stopping maestro task", mac);
+            break;
+        }
+
+        // Maestro historically listens on channel 1 or 2 — probe both.
+        let mut stream = None;
+        for channel in [1, 2] {
+            let socket = match bluer::rfcomm::Socket::new() {
+                Ok(s) => s,
+                Err(e) => {
+                    error!("Failed to create RFCOMM socket: {}", e);
+                    return Err(e.into());
+                }
+            };
+            let target = bluer::rfcomm::SocketAddr::new(addr, channel);
+            debug!(
+                "Trying to connect RFCOMM to {} on channel {}...",
+                mac, channel
+            );
+            match socket.connect(target).await {
+                Ok(s) => {
+                    stream = Some(s);
+                    break;
+                }
+                Err(e) => {
+                    debug!("Failed to connect to channel {}: {}", channel, e);
+                }
+            }
+        }
+
+        let stream = match stream {
+            Some(s) => s,
+            None => {
+                warn!(
+                    "Failed to connect RFCOMM to {} on any common channel. Retrying in 15s...",
+                    mac
+                );
+                tokio::time::sleep(Duration::from_secs(15)).await;
+                continue;
+            }
+        };
+
+        info!("Connected Maestro RFCOMM to {} on channel", mac);
+
+        let codec = Codec::new();
+        let stream = codec.wrap(stream);
+        let mut client = Client::new(stream);
+        let handle = client.handle();
+
+        let channel = match maestro::protocol::utils::resolve_channel(&mut client).await {
+            Ok(c) => c,
+            Err(e) => {
+                error!("Failed to resolve Maestro channel for {}: {}", mac, e);
+                continue;
+            }
+        };
+
+        tokio::spawn(async move {
+            if let Err(e) = client.run().await {
+                error!("Maestro client loop error: {}", e);
+            }
+        });
+
+        let mut service = MaestroService::new(handle, channel);
+
+        // Successful connect — clear health backoff for bt.buds.
+        {
+            let mut lock = state.health.write().await;
+            let health = lock.entry("bt.buds".to_string()).or_default();
+            health.consecutive_failures = 0;
+            health.backoff_until = None;
+        }
+
+        if let Ok(val) = service
+            .read_setting_var(settings::SettingId::CurrentAncrState)
+            .await
+            && let SettingValue::CurrentAncrState(anc_state) = val
+        {
+            let mut lock = statuses.lock().unwrap();
+            let status = lock.entry(mac.to_string()).or_default();
+            status.anc_state = anc_state_to_string(&anc_state);
+            status.last_update = Some(Instant::now());
+        }
+
+        let mut runtime_info_call = match service.subscribe_to_runtime_info() {
+            Ok(c) => c,
+            Err(e) => {
+                error!("Failed to subscribe to runtime info for {}: {}", mac, e);
+                continue;
+            }
+        };
+
+        let mut runtime_info = runtime_info_call.stream();
+
+        let mut settings_changes_call = match service.subscribe_to_settings_changes() {
+            Ok(s) => s,
+            Err(e) => {
+                error!("Failed to subscribe to settings changes for {}: {}", mac, e);
+                continue;
+            }
+        };
+
+        let mut settings_changes = settings_changes_call.stream();
+
+        debug!("Subscribed to status and settings for {}", mac);
+
+        loop {
+            tokio::select! {
+                cmd = rx.recv() => {
+                    match cmd {
+                        Some(BudsCommand::SetAnc(mode)) => {
+                            debug!("Setting ANC mode to {} for {}", mode, mac);
+                            let state = mode_to_anc_state(&mode);
+                            let val = SettingValue::CurrentAncrState(state);
+
+                            {
+                                let mut lock = statuses.lock().unwrap();
+                                let status = lock.entry(mac.to_string()).or_default();
+                                status.anc_state = mode.clone();
+                                status.last_update = Some(Instant::now());
+                            }
+
+                            if let Err(e) = service.write_setting(val).await {
+                                error!("Failed to write ANC setting for {}: {}", mac, e);
+                            }
+                        }
+                        None => return Ok(()),
+                    }
+                }
+                Some(res) = runtime_info.next() => {
+                    match res {
+                        Ok(info) => {
+                            let mut lock = statuses.lock().unwrap();
+                            let status = lock.entry(mac.to_string()).or_default();
+                            status.last_update = Some(Instant::now());
+
+                            if let Some(bat) = info.battery_info {
+                                status.left_battery = bat.left.map(|b| b.level as u8);
+                                status.right_battery = bat.right.map(|b| b.level as u8);
+                                status.case_battery = bat.case.map(|b| b.level as u8);
+                            }
+                        }
+                        Err(e) => {
+                            warn!("Runtime info stream error for {}: {}", mac, e);
+                            break;
+                        }
+                    }
+                }
+                Some(res) = settings_changes.next() => {
+                    if let Ok(change) = res {
+                        use maestro::protocol::types::settings_rsp::ValueOneof as RspOneof;
+                        use maestro::protocol::types::setting_value::ValueOneof as ValOneof;
+
+                        if let Some(RspOneof::Value(setting_val)) = change.value_oneof
+                            && let Some(ValOneof::CurrentAncrState(anc_state_raw)) = setting_val.value_oneof {
+                                let mut lock = statuses.lock().unwrap();
+                                let status = lock.entry(mac.to_string()).or_default();
+
+                                let anc_state = match anc_state_raw {
+                                    1 => settings::AncState::Off,
+                                    2 => settings::AncState::Active,
+                                    3 => settings::AncState::Aware,
+                                    4 => settings::AncState::Adaptive,
+                                    _ => settings::AncState::Unknown(anc_state_raw),
+                                };
+
+                                status.anc_state = anc_state_to_string(&anc_state);
+                                status.last_update = Some(Instant::now());
+                                debug!(mode = %status.anc_state, "Caught physical ANC toggle");
+                        }
+                    }
+                }
+                _ = tokio::time::sleep(Duration::from_secs(30)) => {
+                    if !device.is_connected().await.unwrap_or(false) {
+                        break;
+                    }
+                }
+            }
+        }
+
+        if !device.is_connected().await.unwrap_or(false) {
+            break;
+        }
+    }
+
+    Ok(())
+}
+
+/// String ("active"/"aware"/"off") → Maestro enum; unknown falls back to `Off`.
+fn mode_to_anc_state(mode: &str) -> settings::AncState {
+    match mode {
+        "active" => settings::AncState::Active,
+        "aware" => settings::AncState::Aware,
+        "off" => settings::AncState::Off,
+        _ => settings::AncState::Off,
+    }
+}
+
+/// Inverse of [`mode_to_anc_state`] for status readout.
+pub fn anc_state_to_string(state: &settings::AncState) -> String {
+    match state {
+        settings::AncState::Active => "active".to_string(),
+        settings::AncState::Aware => "aware".to_string(),
+        settings::AncState::Off => "off".to_string(),
+        _ => "unknown".to_string(),
+    }
+}
+
+static MAESTRO: OnceLock<MaestroManager> = OnceLock::new();
+
+/// Lazily initialise the process-wide [`MaestroManager`] and return a reference.
+pub fn get_maestro(state: &AppReceivers) -> &MaestroManager {
+    MAESTRO.get_or_init(|| MaestroManager::new(state.clone()))
+}

src/modules/bt/mod.rs

@@ -0,0 +1,369 @@
+//! Bluetooth indicator + control (BlueZ via `bluer`).
+//!
+//! Core loop: filter paired+connected audio-sink devices, enrich them via
+//! per-device [`BtPlugin`]s (currently PixelBuds via the Maestro GATT
+//! protocol), and publish the result as [`BtState`]. The module handler
+//! exposes `connect`, `disconnect`, `cycle`, `menu_data`, `get_modes`,
+//! `set_mode`, `cycle_mode` actions for the Waybar menu.
+
+pub mod buds;
+pub mod maestro;
+
+use crate::config::Config;
+use crate::error::Result as FluxoResult;
+use crate::modules::WaybarModule;
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, BtDeviceInfo, BtState};
+use crate::utils::{TokenValue, format_template};
+use anyhow::Result;
+use std::sync::LazyLock;
+use tokio::sync::watch;
+use tracing::{error, warn};
+
+use self::buds::{BtPlugin, PixelBudsPlugin};
+
+/// Background poller that syncs connected BlueZ devices into [`BtState`].
+pub struct BtDaemon {
+    session: Option<bluer::Session>,
+}
+
+impl BtDaemon {
+    /// Construct a new daemon. The BlueZ session is lazily created on first poll.
+    pub fn new() -> Self {
+        Self { session: None }
+    }
+
+    /// Poll wrapper that logs + swallows errors so the outer loop keeps running.
+    pub async fn poll(
+        &mut self,
+        tx: &watch::Sender<BtState>,
+        state: &AppReceivers,
+        config: &Config,
+    ) {
+        if let Err(e) = self.poll_async(tx, state, config).await {
+            error!("BT daemon error: {}", e);
+        }
+    }
+
+    async fn poll_async(
+        &mut self,
+        tx: &watch::Sender<BtState>,
+        state: &AppReceivers,
+        config: &Config,
+    ) -> Result<()> {
+        if self.session.is_none() {
+            self.session = Some(bluer::Session::new().await?);
+        }
+        let session = self.session.as_ref().unwrap();
+        let adapter = session.default_adapter().await?;
+        let adapter_powered = adapter.is_powered().await.unwrap_or(false);
+
+        let mut connected_devices = Vec::new();
+
+        if adapter_powered {
+            let mut addresses = adapter.device_addresses().await?;
+            addresses.sort();
+            let audio_sink_uuid = bluer::Uuid::from_u128(0x0000110b_0000_1000_8000_00805f9b34fb);
+
+            for addr in addresses {
+                let device = adapter.device(addr)?;
+                if !device.is_connected().await.unwrap_or(false) {
+                    continue;
+                }
+                let uuids = device.uuids().await?.unwrap_or_default();
+                if !uuids.contains(&audio_sink_uuid) {
+                    continue;
+                }
+
+                let mut dev_info = BtDeviceInfo {
+                    device_address: addr.to_string(),
+                    device_alias: device.alias().await.unwrap_or_else(|_| addr.to_string()),
+                    battery_percentage: device.battery_percentage().await.unwrap_or(None),
+                    plugin_data: vec![],
+                };
+
+                for p in PLUGINS.iter() {
+                    if p.can_handle(&dev_info.device_alias, &dev_info.device_address) {
+                        match p.get_data(config, state, &dev_info.device_address).await {
+                            Ok(data) => {
+                                dev_info.plugin_data = data
+                                    .into_iter()
+                                    .map(|(k, v)| {
+                                        let val_str = match v {
+                                            TokenValue::String(s) => s,
+                                            TokenValue::Int(i) => i.to_string(),
+                                            TokenValue::Float(f) => format!("{:.1}", f),
+                                        };
+                                        (k, val_str)
+                                    })
+                                    .collect();
+                            }
+                            Err(e) => {
+                                warn!("Plugin {} failed for {}: {}", p.name(), addr, e);
+                                dev_info
+                                    .plugin_data
+                                    .push(("plugin_error".to_string(), e.to_string()));
+                            }
+                        }
+                        break;
+                    }
+                }
+                connected_devices.push(dev_info);
+            }
+        }
+
+        let _ = tx.send(BtState {
+            adapter_powered,
+            devices: connected_devices,
+        });
+
+        Ok(())
+    }
+}
+
+static PLUGINS: LazyLock<Vec<Box<dyn BtPlugin>>> =
+    LazyLock::new(|| vec![Box::new(PixelBudsPlugin)]);
+
+/// After a user-initiated connect/disconnect, schedule a staircase of
+/// forced polls so the UI catches up even if BlueZ is slow to settle.
+fn trigger_robust_poll(state: AppReceivers) {
+    tokio::spawn(async move {
+        for delay in [200, 500, 1000, 2000, 3000] {
+            tokio::time::sleep(std::time::Duration::from_millis(delay)).await;
+            let _ = state.bt_force_poll.try_send(());
+        }
+    });
+}
+
+/// Resolve a target MAC: use explicit arg if given, otherwise fall back to the active device.
+async fn resolve_target_mac(
+    bt_state: &BtState,
+    state: &AppReceivers,
+    explicit_mac: Option<&str>,
+) -> Option<String> {
+    if let Some(mac) = explicit_mac {
+        return Some(mac.to_string());
+    }
+    let idx = *state.bt_cycle.read().await;
+    bt_state
+        .active_device(idx)
+        .map(|d| d.device_address.clone())
+}
+
+/// Find a device in the current state by MAC.
+fn find_device<'a>(bt_state: &'a BtState, mac: &str) -> Option<&'a BtDeviceInfo> {
+    bt_state.devices.iter().find(|d| d.device_address == mac)
+}
+
+/// Renders the current BT status + handles control actions.
+pub struct BtModule;
+
+impl WaybarModule for BtModule {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        args: &[&str],
+    ) -> FluxoResult<WaybarOutput> {
+        let action = args.first().cloned().unwrap_or("show");
+        let bt_state = state.bluetooth.borrow().clone();
+
+        match action {
+            "connect" => {
+                if let Some(mac) = args.get(1) {
+                    if let Ok(session) = bluer::Session::new().await
+                        && let Ok(adapter) = session.default_adapter().await
+                        && let Ok(addr) = mac.parse::<bluer::Address>()
+                        && let Ok(device) = adapter.device(addr)
+                    {
+                        let _ = device.connect().await;
+                    }
+                    trigger_robust_poll(state.clone());
+                }
+                return Ok(WaybarOutput::default());
+            }
+            "disconnect" => {
+                let target_mac = resolve_target_mac(&bt_state, state, args.get(1).copied()).await;
+                if let Some(mac) = target_mac {
+                    if let Ok(session) = bluer::Session::new().await
+                        && let Ok(adapter) = session.default_adapter().await
+                        && let Ok(addr) = mac.parse::<bluer::Address>()
+                        && let Ok(device) = adapter.device(addr)
+                    {
+                        let _ = device.disconnect().await;
+                    }
+                    trigger_robust_poll(state.clone());
+                }
+                return Ok(WaybarOutput::default());
+            }
+            "cycle" => {
+                let count = bt_state.devices.len();
+                if count > 1 {
+                    let mut idx = state.bt_cycle.write().await;
+                    *idx = (*idx + 1) % count;
+                }
+                let _ = state.bt_force_poll.try_send(());
+                return Ok(WaybarOutput::default());
+            }
+            "menu_data" => {
+                let mut lines = Vec::new();
+
+                for dev in &bt_state.devices {
+                    lines.push(format!(
+                        "CONNECTED:{}|{}",
+                        dev.device_alias, dev.device_address
+                    ));
+                }
+
+                // Also surface paired-but-not-connected devices for the menu.
+                if let Ok(session) = bluer::Session::new().await
+                    && let Ok(adapter) = session.default_adapter().await
+                    && let Ok(addresses) = adapter.device_addresses().await
+                {
+                    let connected_macs: std::collections::HashSet<&str> = bt_state
+                        .devices
+                        .iter()
+                        .map(|d| d.device_address.as_str())
+                        .collect();
+
+                    for addr in addresses {
+                        let addr_str = addr.to_string();
+                        if connected_macs.contains(addr_str.as_str()) {
+                            continue;
+                        }
+                        if let Ok(device) = adapter.device(addr)
+                            && device.is_paired().await.unwrap_or(false)
+                        {
+                            let alias = device.alias().await.unwrap_or_else(|_| addr.to_string());
+                            lines.push(format!("PAIRED:{}|{}", alias, addr_str));
+                        }
+                    }
+                }
+
+                return Ok(WaybarOutput {
+                    text: lines.join("\n"),
+                    ..Default::default()
+                });
+            }
+            "get_modes" => {
+                let target_mac = resolve_target_mac(&bt_state, state, args.get(1).copied()).await;
+                if let Some(mac) = target_mac
+                    && let Some(dev) = find_device(&bt_state, &mac)
+                {
+                    let plugin = PLUGINS
+                        .iter()
+                        .find(|p| p.can_handle(&dev.device_alias, &dev.device_address));
+                    if let Some(p) = plugin {
+                        let modes = p.get_modes(&mac, state).await?;
+                        return Ok(WaybarOutput {
+                            text: modes.join("\n"),
+                            ..Default::default()
+                        });
+                    }
+                }
+                return Ok(WaybarOutput::default());
+            }
+            "set_mode" => {
+                if let Some(mode) = args.get(1) {
+                    let target_mac =
+                        resolve_target_mac(&bt_state, state, args.get(2).copied()).await;
+                    if let Some(mac) = target_mac
+                        && let Some(dev) = find_device(&bt_state, &mac)
+                    {
+                        let plugin = PLUGINS
+                            .iter()
+                            .find(|p| p.can_handle(&dev.device_alias, &dev.device_address));
+                        if let Some(p) = plugin {
+                            p.set_mode(mode, &mac, state).await?;
+                            trigger_robust_poll(state.clone());
+                        }
+                    }
+                }
+                return Ok(WaybarOutput::default());
+            }
+            "cycle_mode" => {
+                let target_mac = resolve_target_mac(&bt_state, state, args.get(1).copied()).await;
+                if let Some(mac) = target_mac
+                    && let Some(dev) = find_device(&bt_state, &mac)
+                {
+                    let plugin = PLUGINS
+                        .iter()
+                        .find(|p| p.can_handle(&dev.device_alias, &dev.device_address));
+                    if let Some(p) = plugin {
+                        p.cycle_mode(&mac, state).await?;
+                        trigger_robust_poll(state.clone());
+                    }
+                }
+                return Ok(WaybarOutput::default());
+            }
+            _ => {}
+        }
+
+        if !bt_state.adapter_powered {
+            return Ok(WaybarOutput {
+                text: config.bt.format_disabled.clone(),
+                tooltip: Some("Bluetooth Disabled".to_string()),
+                class: Some("disabled".to_string()),
+                percentage: None,
+            });
+        }
+
+        let cycle_idx = *state.bt_cycle.read().await;
+        if let Some(dev) = bt_state.active_device(cycle_idx) {
+            let mut tokens: Vec<(String, TokenValue)> = vec![
+                (
+                    "alias".to_string(),
+                    TokenValue::String(dev.device_alias.clone()),
+                ),
+                (
+                    "mac".to_string(),
+                    TokenValue::String(dev.device_address.clone()),
+                ),
+            ];
+
+            let mut class = vec!["connected".to_string()];
+            let mut has_plugin = false;
+
+            for (k, v) in &dev.plugin_data {
+                if k == "plugin_class" {
+                    class.push(v.clone());
+                    has_plugin = true;
+                } else if k == "plugin_error" {
+                    class.push("plugin-error".to_string());
+                } else {
+                    tokens.push((k.clone(), TokenValue::String(v.clone())));
+                }
+            }
+
+            let format = if has_plugin {
+                &config.bt.format_plugin
+            } else {
+                &config.bt.format_connected
+            };
+
+            let text = format_template(format, &tokens);
+            let tooltip = format!(
+                "{} | MAC: {}\nBattery: {}",
+                dev.device_alias,
+                dev.device_address,
+                dev.battery_percentage
+                    .map(|b| format!("{}%", b))
+                    .unwrap_or_else(|| "N/A".to_string())
+            );
+
+            Ok(WaybarOutput {
+                text,
+                tooltip: Some(tooltip),
+                class: Some(class.join(" ")),
+                percentage: dev.battery_percentage,
+            })
+        } else {
+            Ok(WaybarOutput {
+                text: config.bt.format_disconnected.clone(),
+                tooltip: Some("Bluetooth On (Disconnected)".to_string()),
+                class: Some("disconnected".to_string()),
+                percentage: None,
+            })
+        }
+    }
+}

src/modules/btrfs.rs

@@ -1,18 +1,27 @@
+//! Btrfs pool renderer: sums usage across all btrfs-typed mounts seen in the
+//! `disks` watch channel. Dispatch-only (no dedicated poll task).
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::{TokenValue, format_template};
+use crate::utils::{TokenValue, classify_usage, format_template};
-use anyhow::Result;
 
+/// Aggregates used/total across every mount whose filesystem name contains
+/// `btrfs`. Emits `No BTRFS` when none are present.
 pub struct BtrfsModule;
 
 impl WaybarModule for BtrfsModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
-        let disks = if let Ok(s) = state.read() {
+        &self,
-            s.disks.clone()
+        config: &Config,
-        } else {
+        state: &AppReceivers,
-            return Err(anyhow::anyhow!("Failed to read state"));
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let disks = {
+            let s = state.disks.borrow();
+            s.clone()
         };
 
         let mut total_used: f64 = 0.0;
@@ -40,13 +49,7 @@ impl WaybarModule for BtrfsModule {
         let size_gb = total_size / 1024.0 / 1024.0 / 1024.0;
         let percentage = (total_used / total_size) * 100.0;
 
-        let class = if percentage > 95.0 {
+        let class = classify_usage(percentage, 80.0, 95.0);
-            "max"
-        } else if percentage > 80.0 {
-            "high"
-        } else {
-            "normal"
-        };
 
         let text = format_template(
             &config.pool.format,

src/modules/buds.rs

@@ -1,146 +0,0 @@
-use crate::config::Config;
-use crate::modules::WaybarModule;
-use crate::output::WaybarOutput;
-use crate::state::SharedState;
-use crate::utils::{TokenValue, format_template};
-use anyhow::Result;
-use std::process::Command;
-
-pub struct BudsModule;
-
-impl WaybarModule for BudsModule {
-    fn run(&self, config: &Config, _state: &SharedState, args: &[&str]) -> Result<WaybarOutput> {
-        let action = args.first().unwrap_or(&"show");
-        let mac = &config.buds.mac;
-
-        match *action {
-            "cycle_anc" => {
-                let output = Command::new("pbpctrl").args(["get", "anc"]).output()?;
-                let current_mode = String::from_utf8_lossy(&output.stdout).trim().to_string();
-
-                let next_mode = match current_mode.as_str() {
-                    "active" => "aware",
-                    "aware" => "off",
-                    _ => "active",
-                };
-
-                Command::new("pbpctrl")
-                    .args(["set", "anc", next_mode])
-                    .status()?;
-                return Ok(WaybarOutput {
-                    text: String::new(),
-                    tooltip: None,
-                    class: None,
-                    percentage: None,
-                });
-            }
-            "connect" => {
-                Command::new("bluetoothctl")
-                    .args(["connect", mac])
-                    .status()?;
-                return Ok(WaybarOutput {
-                    text: String::new(),
-                    tooltip: None,
-                    class: None,
-                    percentage: None,
-                });
-            }
-            "disconnect" => {
-                Command::new("bluetoothctl")
-                    .args(["disconnect", mac])
-                    .status()?;
-                return Ok(WaybarOutput {
-                    text: String::new(),
-                    tooltip: None,
-                    class: None,
-                    percentage: None,
-                });
-            }
-            "show" => {}
-            other => {
-                return Err(anyhow::anyhow!("Unknown buds action: '{}'", other));
-            }
-        }
-
-        let bt_info = Command::new("bluetoothctl").args(["info", mac]).output()?;
-        let bt_str = String::from_utf8_lossy(&bt_info.stdout);
-
-        if !bt_str.contains("Connected: yes") {
-            return Ok(WaybarOutput {
-                text: config.buds.format_disconnected.clone(),
-                tooltip: Some("Pixel Buds Pro 2 not connected".to_string()),
-                class: Some("disconnected".to_string()),
-                percentage: None,
-            });
-        }
-
-        let bat_cmd = Command::new("pbpctrl").args(["show", "battery"]).output();
-        if bat_cmd.is_err() || !bat_cmd.as_ref().unwrap().status.success() {
-            return Ok(WaybarOutput {
-                text: config.buds.format_disconnected.clone(),
-                tooltip: Some("Pixel Buds Pro 2 connected (No Data)".to_string()),
-                class: Some("disconnected".to_string()),
-                percentage: None,
-            });
-        }
-
-        let bat_result = bat_cmd.unwrap();
-        let bat_output = String::from_utf8_lossy(&bat_result.stdout);
-        let mut left_bud = "unknown";
-        let mut right_bud = "unknown";
-
-        for line in bat_output.lines() {
-            if line.contains("left bud:") {
-                left_bud = line.split_whitespace().nth(2).unwrap_or("unknown");
-            } else if line.contains("right bud:") {
-                right_bud = line.split_whitespace().nth(2).unwrap_or("unknown");
-            }
-        }
-
-        if left_bud == "unknown" && right_bud == "unknown" {
-            return Ok(WaybarOutput {
-                text: "{}".to_string(),
-                tooltip: None,
-                class: None,
-                percentage: None,
-            });
-        }
-
-        let left_display = if left_bud == "unknown" {
-            "---".to_string()
-        } else {
-            format!("{}%", left_bud)
-        };
-        let right_display = if right_bud == "unknown" {
-            "---".to_string()
-        } else {
-            format!("{}%", right_bud)
-        };
-
-        let anc_cmd = Command::new("pbpctrl").args(["get", "anc"]).output()?;
-        let current_mode = String::from_utf8_lossy(&anc_cmd.stdout).trim().to_string();
-
-        let (anc_icon, class) = match current_mode.as_str() {
-            "active" => ("ANC", "anc-active"),
-            "aware" => ("Aware", "anc-aware"),
-            "off" => ("Off", "anc-off"),
-            _ => ("?", "anc-unknown"),
-        };
-
-        let text = format_template(
-            &config.buds.format,
-            &[
-                ("left", TokenValue::String(&left_display)),
-                ("right", TokenValue::String(&right_display)),
-                ("anc", TokenValue::String(anc_icon)),
-            ],
-        );
-
-        Ok(WaybarOutput {
-            text,
-            tooltip: Some("Pixel Buds Pro 2".to_string()),
-            class: Some(class.to_string()),
-            percentage: None,
-        })
-    }
-}

src/modules/cpu.rs

@@ -1,24 +1,25 @@
+//! CPU usage + temperature renderer. Reads from the `cpu` watch channel.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::{TokenValue, format_template};
+use crate::utils::{TokenValue, classify_usage, format_template};
-use anyhow::Result;
 
+/// Renders CPU usage/temp using [`CpuConfig::format`](crate::config::CpuConfig).
 pub struct CpuModule;
 
 impl WaybarModule for CpuModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
         let (usage, temp, model) = {
-            if let Ok(state_lock) = state.read() {
+            let s = state.cpu.borrow();
-                (
+            (s.usage, s.temp, s.model.clone())
-                    state_lock.cpu.usage,
-                    state_lock.cpu.temp,
-                    state_lock.cpu.model.clone(),
-                )
-            } else {
-                (0.0, 0.0, String::from("Unknown"))
-            }
         };
 
         let text = format_template(
@@ -29,13 +30,7 @@ impl WaybarModule for CpuModule {
             ],
         );
 
-        let class = if usage > 95.0 {
+        let class = classify_usage(usage, 75.0, 95.0);
-            "max"
-        } else if usage > 75.0 {
-            "high"
-        } else {
-            "normal"
-        };
 
         Ok(WaybarOutput {
             text,
@@ -45,3 +40,58 @@ impl WaybarModule for CpuModule {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::state::{AppState, CpuState, mock_state};
+
+    #[tokio::test]
+    async fn test_cpu_normal() {
+        let state = mock_state(AppState {
+            cpu: CpuState {
+                usage: 25.0,
+                temp: 45.0,
+                model: "Test CPU".into(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = CpuModule.run(&config, &state.receivers, &[]).await.unwrap();
+        assert!(output.text.contains("25.0"));
+        assert!(output.text.contains("45.0"));
+        assert_eq!(output.class.as_deref(), Some("normal"));
+        assert_eq!(output.percentage, Some(25));
+        assert_eq!(output.tooltip.as_deref(), Some("Test CPU"));
+    }
+
+    #[tokio::test]
+    async fn test_cpu_high() {
+        let state = mock_state(AppState {
+            cpu: CpuState {
+                usage: 80.0,
+                temp: 70.0,
+                model: "Test".into(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = CpuModule.run(&config, &state.receivers, &[]).await.unwrap();
+        assert_eq!(output.class.as_deref(), Some("high"));
+    }
+
+    #[tokio::test]
+    async fn test_cpu_max() {
+        let state = mock_state(AppState {
+            cpu: CpuState {
+                usage: 99.0,
+                temp: 95.0,
+                model: "Test".into(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = CpuModule.run(&config, &state.receivers, &[]).await.unwrap();
+        assert_eq!(output.class.as_deref(), Some("max"));
+    }
+}

src/modules/disk.rs

@@ -1,21 +1,33 @@
+//! Filesystem usage renderer. Args: `[mountpoint]` (default `/`).
+
 use crate::config::Config;
+use crate::error::{FluxoError, Result};
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::{TokenValue, format_template};
+use crate::utils::{TokenValue, classify_usage, format_template};
-use anyhow::Result;
 
+/// Renders used/total for a given mount point. Returns [`FluxoError::Module`]
+/// if the mount point isn't present in the current disk snapshot.
 pub struct DiskModule;
 
 impl WaybarModule for DiskModule {
-    fn run(&self, config: &Config, state: &SharedState, args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        args: &[&str],
+    ) -> Result<WaybarOutput> {
         let mountpoint = args.first().unwrap_or(&"/");
 
-        let disks = if let Ok(s) = state.read() {
+        let disks = state.disks.borrow().clone();
-            s.disks.clone()
+
-        } else {
+        if disks.is_empty() {
-            return Err(anyhow::anyhow!("Failed to read state"));
+            return Ok(WaybarOutput {
-        };
+                text: "Disk Loading...".to_string(),
+                ..Default::default()
+            });
+        }
 
         for disk in &disks {
             if disk.mount_point == *mountpoint {
@@ -33,18 +45,12 @@ impl WaybarModule for DiskModule {
                     0.0
                 };
 
-                let class = if percentage > 95.0 {
+                let class = classify_usage(percentage, 80.0, 95.0);
-                    "max"
-                } else if percentage > 80.0 {
-                    "high"
-                } else {
-                    "normal"
-                };
 
                 let text = format_template(
                     &config.disk.format,
                     &[
-                        ("mount", TokenValue::String(mountpoint)),
+                        ("mount", TokenValue::String(mountpoint.to_string())),
                         ("used", TokenValue::Float(used_gb)),
                         ("total", TokenValue::Float(total_gb)),
                     ],
@@ -62,6 +68,62 @@ impl WaybarModule for DiskModule {
             }
         }
 
-        Err(anyhow::anyhow!("Mountpoint {} not found", mountpoint))
+        Err(FluxoError::Module {
+            module: "disk",
+            message: format!("Mountpoint {} not found", mountpoint),
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::state::{AppState, DiskInfo, MockState, mock_state};
+
+    fn state_with_disk(mount: &str, total: u64, available: u64) -> MockState {
+        mock_state(AppState {
+            disks: vec![DiskInfo {
+                mount_point: mount.to_string(),
+                filesystem: "ext4".to_string(),
+                total_bytes: total,
+                available_bytes: available,
+            }],
+            ..Default::default()
+        })
+    }
+
+    #[tokio::test]
+    async fn test_disk_found() {
+        let gb = 1024 * 1024 * 1024;
+        let state = state_with_disk("/", 100 * gb, 60 * gb);
+        let config = Config::default();
+        let output = DiskModule
+            .run(&config, &state.receivers, &["/"])
+            .await
+            .unwrap();
+        assert_eq!(output.class.as_deref(), Some("normal"));
+        assert_eq!(output.percentage, Some(40)); // 40% used
+    }
+
+    #[tokio::test]
+    async fn test_disk_high() {
+        let gb = 1024 * 1024 * 1024;
+        let state = state_with_disk("/", 100 * gb, 15 * gb);
+        let config = Config::default();
+        let output = DiskModule
+            .run(&config, &state.receivers, &["/"])
+            .await
+            .unwrap();
+        assert_eq!(output.class.as_deref(), Some("high")); // 85% used
+    }
+
+    #[tokio::test]
+    async fn test_disk_not_found() {
+        let state = state_with_disk("/", 100, 50);
+        let config = Config::default();
+        let result = DiskModule
+            .run(&config, &state.receivers, &["/nonexistent"])
+            .await;
+        assert!(result.is_err());
     }
 }

src/modules/dnd.rs

@@ -0,0 +1,209 @@
+//! Do-Not-Disturb toggle + status for SwayNC or Dunst.
+//!
+//! SwayNC exposes a `dnd` property on its `org.erikreider.swaync.control`
+//! interface that fires PropertiesChanged signals, so we subscribe. Dunst has
+//! no change signal for its `paused` property, so we fall back to a 2 s poll.
+
+use crate::config::Config;
+use crate::error::Result;
+use crate::modules::WaybarModule;
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, DndState};
+use futures::StreamExt;
+use tokio::sync::watch;
+use tokio::time::Duration;
+use tracing::{debug, error, info};
+use zbus::proxy;
+use zbus::zvariant::OwnedValue;
+use zbus::{Connection, fdo::PropertiesProxy};
+
+/// Renders + toggles DND state. Args: `["show"]` (default) or `["toggle"]`.
+pub struct DndModule;
+
+/// Read dunst's `paused` property via raw D-Bus call.
+async fn dunst_get_paused(connection: &Connection) -> anyhow::Result<bool> {
+    let reply = connection
+        .call_method(
+            Some("org.freedesktop.Notifications"),
+            "/org/freedesktop/Notifications",
+            Some("org.freedesktop.DBus.Properties"),
+            "Get",
+            &("org.dunstproject.cmd0", "paused"),
+        )
+        .await?;
+    let value: OwnedValue = reply.body().deserialize()?;
+    Ok(bool::try_from(&*value)?)
+}
+
+/// Set dunst's `paused` property via raw D-Bus call.
+async fn dunst_set_paused(connection: &Connection, paused: bool) -> anyhow::Result<()> {
+    let value = zbus::zvariant::Value::from(paused);
+    connection
+        .call_method(
+            Some("org.freedesktop.Notifications"),
+            "/org/freedesktop/Notifications",
+            Some("org.freedesktop.DBus.Properties"),
+            "Set",
+            &("org.dunstproject.cmd0", "paused", value),
+        )
+        .await?;
+    Ok(())
+}
+
+impl WaybarModule for DndModule {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let action = args.first().unwrap_or(&"show");
+
+        if *action == "toggle" {
+            let connection =
+                Connection::session()
+                    .await
+                    .map_err(|e| crate::error::FluxoError::Module {
+                        module: "dnd",
+                        message: format!("DBus connection failed: {}", e),
+                    })?;
+
+            if let Ok(proxy) = SwayncControlProxy::new(&connection).await
+                && let Ok(is_dnd) = proxy.dnd().await
+            {
+                let _ = proxy.set_dnd(!is_dnd).await;
+                return Ok(WaybarOutput::default());
+            }
+
+            if let Ok(is_paused) = dunst_get_paused(&connection).await {
+                let _ = dunst_set_paused(&connection, !is_paused).await;
+                return Ok(WaybarOutput::default());
+            }
+
+            return Err(crate::error::FluxoError::Module {
+                module: "dnd",
+                message: "No supported notification daemon found to toggle".to_string(),
+            });
+        }
+
+        let is_dnd = state.dnd.borrow().is_dnd;
+
+        if is_dnd {
+            Ok(WaybarOutput {
+                text: config.dnd.format_dnd.clone(),
+                tooltip: Some("Do Not Disturb: On".to_string()),
+                class: Some("dnd".to_string()),
+                percentage: None,
+            })
+        } else {
+            Ok(WaybarOutput {
+                text: config.dnd.format_normal.clone(),
+                tooltip: Some("Do Not Disturb: Off".to_string()),
+                class: Some("normal".to_string()),
+                percentage: None,
+            })
+        }
+    }
+}
+
+/// Background watcher that keeps [`DndState`] in sync with the active
+/// notification daemon (SwayNC via signals, Dunst via polling).
+pub struct DndDaemon;
+
+#[proxy(
+    interface = "org.erikreider.swaync.control",
+    default_service = "org.erikreider.swaync.control",
+    default_path = "/org/erikreider/swaync/control"
+)]
+trait SwayncControl {
+    #[zbus(property)]
+    fn dnd(&self) -> zbus::Result<bool>;
+    #[zbus(property)]
+    fn set_dnd(&self, value: bool) -> zbus::Result<()>;
+}
+
+impl DndDaemon {
+    /// Construct a new (stateless) daemon.
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Spawn a supervised listen loop that reconnects with a 5 s backoff.
+    pub fn start(&self, tx: watch::Sender<DndState>) {
+        tokio::spawn(async move {
+            loop {
+                if let Err(e) = Self::listen_loop(&tx).await {
+                    error!("DND listener error: {}", e);
+                    tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
+                }
+            }
+        });
+    }
+
+    async fn listen_loop(tx: &watch::Sender<DndState>) -> anyhow::Result<()> {
+        let connection = Connection::session().await?;
+
+        info!("Connected to D-Bus for DND monitoring");
+
+        if let Ok(proxy) = SwayncControlProxy::new(&connection).await
+            && let Ok(is_dnd) = proxy.dnd().await
+        {
+            debug!("Found SwayNC, using signal-based DND monitoring");
+            let _ = tx.send(DndState { is_dnd });
+
+            if let Ok(props_proxy) = PropertiesProxy::builder(&connection)
+                .destination("org.erikreider.swaync.control")?
+                .path("/org/erikreider/swaync/control")?
+                .build()
+                .await
+            {
+                let mut stream = props_proxy.receive_properties_changed().await?;
+                while let Some(signal) = stream.next().await {
+                    let args = signal.args()?;
+                    if args.interface_name == "org.erikreider.swaync.control"
+                        && let Some(val) = args.changed_properties.get("dnd")
+                        && let Ok(is_dnd) = bool::try_from(val)
+                    {
+                        let _ = tx.send(DndState { is_dnd });
+                    }
+                }
+            }
+
+            return Err(anyhow::anyhow!("SwayNC DND stream ended"));
+        }
+
+        // Dunst: raw D-Bus call avoids zbus proxy typing quirks with its
+        // non-standard `org.dunstproject.cmd0` interface.
+        match dunst_get_paused(&connection).await {
+            Ok(is_paused) => {
+                info!("Found Dunst, using polling-based DND monitoring");
+                let _ = tx.send(DndState { is_dnd: is_paused });
+
+                loop {
+                    tokio::time::sleep(Duration::from_secs(2)).await;
+                    match dunst_get_paused(&connection).await {
+                        Ok(is_paused) => {
+                            let current = tx.borrow().is_dnd;
+                            if current != is_paused {
+                                let _ = tx.send(DndState { is_dnd: is_paused });
+                            }
+                        }
+                        Err(e) => {
+                            debug!("Dunst paused() poll failed: {}", e);
+                            break;
+                        }
+                    }
+                }
+
+                return Err(anyhow::anyhow!("Dunst connection lost"));
+            }
+            Err(e) => {
+                info!("Dunst not available: {}", e);
+            }
+        }
+
+        Err(anyhow::anyhow!(
+            "No supported notification daemon found (tried SwayNC, Dunst)"
+        ))
+    }
+}

src/modules/game.rs

@@ -1,15 +1,26 @@
+//! Gamemode indicator. Queries Hyprland's animation setting over its IPC
+//! socket; animations disabled => gamemode active. Dispatch-only.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::run_command;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
-use anyhow::Result;
+use tokio::net::UnixStream;
 
+/// Renders a glyph depending on whether Hyprland animations are disabled.
 pub struct GameModule;
 
 impl WaybarModule for GameModule {
-    fn run(&self, config: &Config, _state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
-        let is_gamemode = run_command("hyprctl", &["getoption", "animations:enabled", "-j"])
+        &self,
+        config: &Config,
+        _state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let is_gamemode = hyprland_ipc("j/getoption animations:enabled")
+            .await
             .map(|stdout| stdout.contains("\"int\": 0"))
             .unwrap_or(false);
 
@@ -30,3 +41,16 @@ impl WaybarModule for GameModule {
         }
     }
 }
+
+/// Send `cmd` to Hyprland's `.socket.sock` and return the response body.
+async fn hyprland_ipc(cmd: &str) -> Result<String> {
+    let path = crate::utils::get_hyprland_socket(".socket.sock")?;
+
+    let mut stream = UnixStream::connect(path).await?;
+    stream.write_all(cmd.as_bytes()).await?;
+
+    let mut response = String::new();
+    stream.read_to_string(&mut response).await?;
+
+    Ok(response)
+}

src/modules/gpu.rs

@@ -1,36 +1,34 @@
+//! GPU renderer. Picks a vendor-specific format string (AMD/Intel/NVIDIA) and
+//! reads from the `gpu` watch channel.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::{TokenValue, format_template};
+use crate::utils::{TokenValue, classify_usage, format_template};
-use anyhow::Result;
 
+/// Renders GPU usage / VRAM / temp using the per-vendor format from config.
 pub struct GpuModule;
 
 impl WaybarModule for GpuModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
         let (active, vendor, usage, vram_used, vram_total, temp, model) = {
-            if let Ok(state_lock) = state.read() {
+            let s = state.gpu.borrow();
             (
-                    state_lock.gpu.active,
+                s.active,
-                    state_lock.gpu.vendor.clone(),
+                s.vendor.clone(),
-                    state_lock.gpu.usage,
+                s.usage,
-                    state_lock.gpu.vram_used,
+                s.vram_used,
-                    state_lock.gpu.vram_total,
+                s.vram_total,
-                    state_lock.gpu.temp,
+                s.temp,
-                    state_lock.gpu.model.clone(),
+                s.model.clone(),
             )
-            } else {
-                (
-                    false,
-                    String::from("Unknown"),
-                    0.0,
-                    0.0,
-                    0.0,
-                    0.0,
-                    String::from("Unknown"),
-                )
-            }
         };
 
         if !active {
@@ -42,13 +40,7 @@ impl WaybarModule for GpuModule {
             });
         }
 
-        let class = if usage > 95.0 {
+        let class = classify_usage(usage, 75.0, 95.0);
-            "max"
-        } else if usage > 75.0 {
-            "high"
-        } else {
-            "normal"
-        };
 
         let format_str = match vendor.as_str() {
             "Intel" => &config.gpu.format_intel,

src/modules/hardware.rs

@@ -1,6 +1,16 @@
-use crate::state::{DiskInfo, SharedState};
+//! Unified CPU/memory/sys/GPU/disk poller.
-use sysinfo::{Components, Disks, System};
+//!
+//! CPU/memory/sys are sampled every fast tick (1 s). GPU polls every 5th fast
+//! tick via [`poll_slow`], and disks every 10th (they rarely change). GPU
+//! vendor is detected once by probing nvidia-smi / `/sys/class/drm/*`, then
+//! cached so subsequent polls take the fast path.
 
+use crate::state::{CpuState, DiskInfo, GpuState, MemoryState, SysState};
+use sysinfo::{Components, Disks, System};
+use tokio::sync::watch;
+
+/// Long-lived hardware sampler. Holds the `sysinfo::System` handle so
+/// successive refreshes can diff against prior samples.
 pub struct HardwareDaemon {
     sys: System,
     components: Components,
@@ -10,6 +20,7 @@ pub struct HardwareDaemon {
 }
 
 impl HardwareDaemon {
+    /// Build a new daemon with an initial `sysinfo` snapshot.
     pub fn new() -> Self {
         let mut sys = System::new();
         sys.refresh_cpu_usage();
@@ -20,11 +31,19 @@ impl HardwareDaemon {
             components,
             gpu_vendor: None,
             gpu_poll_counter: 0,
-            disk_poll_counter: 0,
+            // Start at 9 so (counter + 1) % 10 == 0 on the first tick.
+            disk_poll_counter: 9,
         }
     }
 
-    pub fn poll(&mut self, state: SharedState) {
+    /// Fast path: refresh CPU usage, memory, temperatures, load avg, uptime.
+    /// Called every daemon tick.
+    pub async fn poll_fast(
+        &mut self,
+        cpu_tx: &watch::Sender<CpuState>,
+        mem_tx: &watch::Sender<MemoryState>,
+        sys_tx: &watch::Sender<SysState>,
+    ) {
         self.sys.refresh_cpu_usage();
         self.sys.refresh_memory();
         self.components.refresh(true);
@@ -70,30 +89,46 @@ impl HardwareDaemon {
             }
         }
 
-        if let Ok(mut state_lock) = state.write() {
+        let mut cpu = cpu_tx.borrow().clone();
-            state_lock.cpu.usage = cpu_usage as f64;
+        cpu.usage = cpu_usage as f64;
-            state_lock.cpu.temp = cpu_temp;
+        cpu.temp = cpu_temp;
-            state_lock.cpu.model = cpu_model;
+        cpu.model = cpu_model;
+        let _ = cpu_tx.send(cpu);
 
-            state_lock.memory.total_gb = total_mem;
+        let mut mem = mem_tx.borrow().clone();
-            state_lock.memory.used_gb = used_mem;
+        mem.total_gb = total_mem;
+        mem.used_gb = used_mem;
+        let _ = mem_tx.send(mem);
 
-            state_lock.sys.load_1 = load_avg.one;
+        let mut sys = sys_tx.borrow().clone();
-            state_lock.sys.load_5 = load_avg.five;
+        sys.load_1 = load_avg.one;
-            state_lock.sys.load_15 = load_avg.fifteen;
+        sys.load_5 = load_avg.five;
-            state_lock.sys.uptime = uptime;
+        sys.load_15 = load_avg.fifteen;
-            state_lock.sys.process_count = process_count;
+        sys.uptime = uptime;
-
+        sys.process_count = process_count;
-            // Poll GPU every 5 seconds to avoid expensive nvidia-smi calls
+        let _ = sys_tx.send(sys);
-            self.gpu_poll_counter = (self.gpu_poll_counter + 1) % 5;
-            if self.gpu_poll_counter == 0 {
-                self.poll_gpu(&mut state_lock.gpu);
     }
 
-            // Poll disks every 10 seconds
+    /// Slow path: GPU every 5 ticks, disks every 10 ticks. Each sub-poll
+    /// runs off the hot loop before any state is published.
+    pub async fn poll_slow(
+        &mut self,
+        gpu_tx: &watch::Sender<GpuState>,
+        disks_tx: &watch::Sender<Vec<DiskInfo>>,
+    ) {
+        let mut gpu_state = crate::state::GpuState::default();
+        self.gpu_poll_counter = (self.gpu_poll_counter + 1) % 5;
+        let should_poll_gpu = self.gpu_poll_counter == 0;
+        if should_poll_gpu {
+            self.poll_gpu(&mut gpu_state).await;
+        }
+
+        let mut disks_data = None;
         self.disk_poll_counter = (self.disk_poll_counter + 1) % 10;
         if self.disk_poll_counter == 0 {
-                state_lock.disks = Disks::new_with_refreshed_list()
+            disks_data = Some(
+                tokio::task::spawn_blocking(|| {
+                    Disks::new_with_refreshed_list()
                         .iter()
                         .map(|d| DiskInfo {
                             mount_point: d.mount_point().to_string_lossy().into_owned(),
@@ -101,23 +136,71 @@ impl HardwareDaemon {
                             total_bytes: d.total_space(),
                             available_bytes: d.available_space(),
                         })
-                    .collect();
+                        .collect::<Vec<DiskInfo>>()
+                })
+                .await
+                .unwrap_or_default(),
+            );
         }
+
+        if should_poll_gpu {
+            let _ = gpu_tx.send(gpu_state);
+        }
+
+        if let Some(d) = disks_data {
+            let _ = disks_tx.send(d);
         }
     }
 
-    fn poll_gpu(&mut self, gpu: &mut crate::state::GpuState) {
+    /// Dispatch to the cached vendor's probe, or run detection on first call.
+    async fn poll_gpu(&mut self, gpu: &mut crate::state::GpuState) {
         gpu.active = false;
 
-        if (self.gpu_vendor.as_deref() == Some("NVIDIA") || self.gpu_vendor.is_none())
+        match self.gpu_vendor.as_deref() {
-            && let Ok(output) = std::process::Command::new("nvidia-smi")
+            Some("NVIDIA") => {
+                Self::poll_nvidia(gpu).await;
+            }
+            Some("AMD") => {
+                Self::poll_amd(gpu);
+            }
+            Some("Intel") => {
+                Self::poll_intel(gpu);
+            }
+            _ => {
+                // First run — probe each vendor and cache the first hit.
+                Self::poll_nvidia(gpu).await;
+                if gpu.active {
+                    self.gpu_vendor = Some("NVIDIA".to_string());
+                    return;
+                }
+                Self::poll_amd(gpu);
+                if gpu.active {
+                    self.gpu_vendor = Some("AMD".to_string());
+                    return;
+                }
+                Self::poll_intel(gpu);
+                if gpu.active {
+                    self.gpu_vendor = Some("Intel".to_string());
+                }
+            }
+        }
+    }
+
+    /// Shell out to `nvidia-smi --query-gpu=...` for utilization/VRAM/temp.
+    async fn poll_nvidia(gpu: &mut crate::state::GpuState) {
+        let Ok(output) = tokio::process::Command::new("nvidia-smi")
             .args([
                 "--query-gpu=utilization.gpu,memory.used,memory.total,temperature.gpu,name",
                 "--format=csv,noheader,nounits",
             ])
             .output()
-            && output.status.success()
+            .await
-        {
+        else {
+            return;
+        };
+        if !output.status.success() {
+            return;
+        }
         let stdout = String::from_utf8_lossy(&output.stdout);
         if let Some(line) = stdout.lines().next() {
             let parts: Vec<&str> = line.split(',').collect();
@@ -129,42 +212,31 @@ impl HardwareDaemon {
                 gpu.vram_total = parts[2].trim().parse::<f64>().unwrap_or(0.0) / 1024.0;
                 gpu.temp = parts[3].trim().parse().unwrap_or(0.0);
                 gpu.model = parts[4].trim().to_string();
-                    self.gpu_vendor = Some("NVIDIA".to_string());
-                    return;
             }
         }
     }
 
-        if self.gpu_vendor.as_deref() == Some("AMD")
+    /// Read amdgpu sysfs entries under `/sys/class/drm/card*/device`.
-            || self.gpu_vendor.as_deref() == Some("Intel")
+    fn poll_amd(gpu: &mut crate::state::GpuState) {
-            || self.gpu_vendor.is_none()
-        {
         for i in 0..=3 {
             let base = format!("/sys/class/drm/card{}/device", i);
+            let Ok(usage_str) = std::fs::read_to_string(format!("{}/gpu_busy_percent", base))
+            else {
+                continue;
+            };
 
-                if (self.gpu_vendor.as_deref() == Some("AMD") || self.gpu_vendor.is_none())
-                    && let Ok(usage_str) =
-                        std::fs::read_to_string(format!("{}/gpu_busy_percent", base))
-                {
             gpu.active = true;
             gpu.vendor = "AMD".to_string();
             gpu.usage = usage_str.trim().parse().unwrap_or(0.0);
 
-                    if let Ok(mem_used) =
+            if let Ok(mem_used) = std::fs::read_to_string(format!("{}/mem_info_vram_used", base)) {
-                        std::fs::read_to_string(format!("{}/mem_info_vram_used", base))
+                gpu.vram_used =
-                    {
+                    mem_used.trim().parse::<f64>().unwrap_or(0.0) / 1024.0 / 1024.0 / 1024.0;
-                        gpu.vram_used = mem_used.trim().parse::<f64>().unwrap_or(0.0)
-                            / 1024.0
-                            / 1024.0
-                            / 1024.0;
             }
-                    if let Ok(mem_total) =
+            if let Ok(mem_total) = std::fs::read_to_string(format!("{}/mem_info_vram_total", base))
-                        std::fs::read_to_string(format!("{}/mem_info_vram_total", base))
             {
-                        gpu.vram_total = mem_total.trim().parse::<f64>().unwrap_or(0.0)
+                gpu.vram_total =
-                            / 1024.0
+                    mem_total.trim().parse::<f64>().unwrap_or(0.0) / 1024.0 / 1024.0 / 1024.0;
-                            / 1024.0
-                            / 1024.0;
             }
 
             if let Ok(entries) = std::fs::read_dir(format!("{}/hwmon", base)) {
@@ -177,18 +249,18 @@ impl HardwareDaemon {
                 }
             }
             gpu.model = "AMD GPU".to_string();
-                    self.gpu_vendor = Some("AMD".to_string());
             return;
         }
+    }
 
-                if self.gpu_vendor.as_deref() == Some("Intel") || self.gpu_vendor.is_none() {
+    /// Read i915/xe sysfs `gt_cur_freq_mhz`; approximate "usage" as
-                    let freq_path =
+    /// current/max frequency since Intel has no direct utilization counter.
-                        if std::path::Path::new(&format!("{}/gt_cur_freq_mhz", base)).exists() {
+    fn poll_intel(gpu: &mut crate::state::GpuState) {
+        for i in 0..=3 {
+            let base = format!("/sys/class/drm/card{}/device", i);
+            let freq_path = if std::path::Path::new(&format!("{}/gt_cur_freq_mhz", base)).exists() {
                 Some(format!("{}/gt_cur_freq_mhz", base))
-                        } else if std::path::Path::new(&format!(
+            } else if std::path::Path::new(&format!("/sys/class/drm/card{}/gt_cur_freq_mhz", i))
-                            "/sys/class/drm/card{}/gt_cur_freq_mhz",
-                            i
-                        ))
                 .exists()
             {
                 Some(format!("/sys/class/drm/card{}/gt_cur_freq_mhz", i))
@@ -219,11 +291,8 @@ impl HardwareDaemon {
                 gpu.vram_used = 0.0;
                 gpu.vram_total = 0.0;
                 gpu.model = format!("Intel iGPU ({}MHz)", cur_freq);
-                        self.gpu_vendor = Some("Intel".to_string());
                 return;
             }
         }
     }
 }
-    }
-}

src/modules/keyboard.rs

@@ -0,0 +1,112 @@
+//! Keyboard layout indicator backed by Hyprland's event socket
+//! (`.socket2.sock`). Also seeds the initial layout by shelling out to
+//! `hyprctl devices -j` once at startup.
+
+use crate::config::Config;
+use crate::error::Result;
+use crate::modules::WaybarModule;
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, KeyboardState};
+use crate::utils::{TokenValue, format_template};
+use anyhow::anyhow;
+use tokio::io::{AsyncBufReadExt, BufReader};
+use tokio::net::UnixStream;
+use tokio::sync::watch;
+use tracing::{error, info};
+
+/// Renders the current keyboard layout from [`KeyboardState`].
+pub struct KeyboardModule;
+
+impl WaybarModule for KeyboardModule {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let layout = state.keyboard.borrow().layout.clone();
+
+        if layout.is_empty() {
+            return Ok(WaybarOutput {
+                text: "Layout Loading...".to_string(),
+                tooltip: None,
+                class: Some("loading".to_string()),
+                percentage: None,
+            });
+        }
+
+        let text = format_template(
+            &config.keyboard.format,
+            &[("layout", TokenValue::String(layout.clone()))],
+        );
+
+        Ok(WaybarOutput {
+            text,
+            tooltip: Some(format!("Keyboard Layout: {}", layout)),
+            class: Some("normal".to_string()),
+            percentage: None,
+        })
+    }
+}
+
+/// Background watcher that subscribes to `activelayout>>` events emitted by
+/// Hyprland's event socket.
+pub struct KeyboardDaemon;
+
+impl KeyboardDaemon {
+    /// Construct a new (stateless) daemon.
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Spawn a supervised listen loop that reconnects with a 5 s backoff.
+    pub fn start(&self, tx: watch::Sender<KeyboardState>) {
+        tokio::spawn(async move {
+            loop {
+                if let Err(e) = Self::listen_loop(&tx).await {
+                    error!("Keyboard layout listener error: {}", e);
+                    tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
+                }
+            }
+        });
+    }
+
+    async fn listen_loop(tx: &watch::Sender<KeyboardState>) -> anyhow::Result<()> {
+        let path = crate::utils::get_hyprland_socket(".socket2.sock")?;
+
+        info!("Connecting to Hyprland event socket: {:?}", path);
+        let stream = UnixStream::connect(path).await?;
+        let reader = BufReader::new(stream);
+        let mut lines = reader.lines();
+
+        if let Ok(output) = tokio::process::Command::new("hyprctl")
+            .args(["devices", "-j"])
+            .output()
+            .await
+            && let Ok(json) = serde_json::from_slice::<serde_json::Value>(&output.stdout)
+            && let Some(keyboards) = json.get("keyboards").and_then(|v| v.as_array())
+            && let Some(main_kb) = keyboards.last()
+        {
+            // `keyboards.last()` is the most recently registered device,
+            // which is typically the main one for single-keyboard setups.
+            if let Some(layout) = main_kb.get("active_keymap").and_then(|v| v.as_str()) {
+                let _ = tx.send(KeyboardState {
+                    layout: layout.to_string(),
+                });
+            }
+        }
+
+        while let Ok(Some(line)) = lines.next_line().await {
+            // Event payload: `keyboard_name,layout_name`.
+            if let Some(payload) = line.strip_prefix("activelayout>>") {
+                let parts: Vec<&str> = payload.splitn(2, ',').collect();
+                if parts.len() == 2 {
+                    let layout = parts[1].to_string();
+                    let _ = tx.send(KeyboardState { layout });
+                }
+            }
+        }
+
+        Err(anyhow!("Hyprland socket closed or read error"))
+    }
+}

src/modules/memory.rs

@@ -1,20 +1,25 @@
+//! RAM usage renderer. Reads from the `memory` watch channel.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use crate::utils::{TokenValue, format_template};
+use crate::utils::{TokenValue, classify_usage, format_template};
-use anyhow::Result;
 
+/// Renders used/total GB with usage classification for Waybar CSS.
 pub struct MemoryModule;
 
 impl WaybarModule for MemoryModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
         let (used_gb, total_gb) = {
-            if let Ok(state_lock) = state.read() {
+            let s = state.memory.borrow();
-                (state_lock.memory.used_gb, state_lock.memory.total_gb)
+            (s.used_gb, s.total_gb)
-            } else {
-                (0.0, 0.0)
-            }
         };
 
         let ratio = if total_gb > 0.0 {
@@ -31,13 +36,7 @@ impl WaybarModule for MemoryModule {
             ],
         );
 
-        let class = if ratio > 95.0 {
+        let class = classify_usage(ratio, 75.0, 95.0);
-            "max"
-        } else if ratio > 75.0 {
-            "high"
-        } else {
-            "normal"
-        };
 
         Ok(WaybarOutput {
             text,
@@ -47,3 +46,64 @@ impl WaybarModule for MemoryModule {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::state::{AppState, MemoryState, mock_state};
+
+    #[tokio::test]
+    async fn test_memory_normal() {
+        let state = mock_state(AppState {
+            memory: MemoryState {
+                used_gb: 8.0,
+                total_gb: 32.0,
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = MemoryModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert!(output.text.contains("8.00"));
+        assert!(output.text.contains("32.00"));
+        assert_eq!(output.class.as_deref(), Some("normal"));
+        assert_eq!(output.percentage, Some(25)); // 8/32 = 25%
+    }
+
+    #[tokio::test]
+    async fn test_memory_high() {
+        let state = mock_state(AppState {
+            memory: MemoryState {
+                used_gb: 26.0,
+                total_gb: 32.0,
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = MemoryModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert_eq!(output.class.as_deref(), Some("high")); // 81%
+    }
+
+    #[tokio::test]
+    async fn test_memory_zero_total() {
+        let state = mock_state(AppState {
+            memory: MemoryState {
+                used_gb: 0.0,
+                total_gb: 0.0,
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = MemoryModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert_eq!(output.class.as_deref(), Some("normal"));
+        assert_eq!(output.percentage, Some(0));
+    }
+}

src/modules/mod.rs

@@ -1,22 +1,67 @@
+//! Waybar module implementations.
+//!
+//! Each submodule exposes a [`WaybarModule`] type (CPU, network, audio, …)
+//! and is feature-gated by a `mod-<kind>` flag. The [`WaybarModule`] trait is
+//! what [`crate::registry::dispatch`] uses to evaluate a module on demand.
+//!
+//! Modules come in two flavours:
+//!
+//! * **Watched** — the daemon spawns a background polling/event task that
+//!   pushes state into a `watch::Receiver`, which the module reads lock-free
+//!   (network, cpu, audio, bluetooth, …).
+//! * **Dispatch-only** — evaluated on demand only, without a watch channel
+//!   (power, game, btrfs).
+
+#[cfg(feature = "mod-audio")]
 pub mod audio;
+#[cfg(feature = "mod-dbus")]
+pub mod backlight;
+#[cfg(feature = "mod-bt")]
 pub mod bt;
+#[cfg(feature = "mod-hardware")]
 pub mod btrfs;
-pub mod buds;
+#[cfg(feature = "mod-hardware")]
 pub mod cpu;
+#[cfg(feature = "mod-hardware")]
 pub mod disk;
+#[cfg(feature = "mod-dbus")]
+pub mod dnd;
+#[cfg(feature = "mod-hardware")]
 pub mod game;
+#[cfg(feature = "mod-hardware")]
 pub mod gpu;
+#[cfg(feature = "mod-hardware")]
 pub mod hardware;
+#[cfg(feature = "mod-dbus")]
+pub mod keyboard;
+#[cfg(feature = "mod-hardware")]
 pub mod memory;
+#[cfg(feature = "mod-dbus")]
+pub mod mpris;
+#[cfg(feature = "mod-network")]
 pub mod network;
+#[cfg(feature = "mod-hardware")]
 pub mod power;
+#[cfg(feature = "mod-hardware")]
 pub mod sys;
 
 use crate::config::Config;
+use crate::error::Result as FluxoResult;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
-use anyhow::Result;
 
+/// Common interface implemented by every Waybar module.
+///
+/// Given the current daemon config, the shared state receivers, and any
+/// caller-supplied arguments, a module produces a single [`WaybarOutput`].
+/// Implementations must be cheap to evaluate — they are invoked on every
+/// client request and on every signaler state change.
 pub trait WaybarModule {
-    fn run(&self, config: &Config, state: &SharedState, args: &[&str]) -> Result<WaybarOutput>;
+    /// Evaluate the module and return its rendered output.
+    fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        args: &[&str],
+    ) -> impl std::future::Future<Output = FluxoResult<WaybarOutput>> + Send;
 }

src/modules/mpris.rs

@@ -0,0 +1,362 @@
+//! MPRIS media player indicator.
+//!
+//! Subscribes to `PlaybackStatus` and `Metadata` property-changed streams on
+//! the first `org.mpris.MediaPlayer2.*` name that appears on the session bus,
+//! so the indicator is truly signal-driven (no 2 s polling). A 10 s heartbeat
+//! verifies the player is still there. Optional marquee scrolling is driven
+//! by [`mpris_scroll_ticker`] from [`crate::daemon`].
+
+use crate::config::Config;
+use crate::error::Result;
+use crate::modules::WaybarModule;
+use crate::output::WaybarOutput;
+use crate::state::{AppReceivers, MprisScrollState, MprisState};
+use crate::utils::{TokenValue, format_template};
+use std::sync::Arc;
+use tokio::sync::{RwLock, watch};
+use tokio::time::Duration;
+use tracing::{debug, info};
+use zbus::{Connection, proxy};
+
+/// Render the user's format string + derive the Waybar CSS class from state.
+fn format_mpris_text(format: &str, mpris: &MprisState) -> (String, &'static str) {
+    let status_icon = if mpris.is_playing {
+        "󰏤"
+    } else if mpris.is_paused {
+        "󰐊"
+    } else {
+        "󰓛"
+    };
+
+    let class = if mpris.is_playing {
+        "playing"
+    } else if mpris.is_paused {
+        "paused"
+    } else {
+        "stopped"
+    };
+
+    let text = format_template(
+        format,
+        &[
+            ("artist", TokenValue::String(mpris.artist.clone())),
+            ("title", TokenValue::String(mpris.title.clone())),
+            ("album", TokenValue::String(mpris.album.clone())),
+            ("status_icon", TokenValue::String(status_icon.to_string())),
+        ],
+    );
+
+    (text, class)
+}
+
+/// Return a cyclic `max_len`-wide window over `full_text + separator`.
+fn apply_scroll_window(full_text: &str, max_len: usize, offset: usize, separator: &str) -> String {
+    let char_count = full_text.chars().count();
+    let total_len = char_count + separator.chars().count();
+    let offset = offset % total_len;
+    full_text
+        .chars()
+        .chain(separator.chars())
+        .cycle()
+        .skip(offset)
+        .take(max_len)
+        .collect()
+}
+
+/// Truncate `text` to `max_len` chars, appending `...` when cut.
+fn truncate_with_ellipsis(text: &str, max_len: usize) -> String {
+    let char_count = text.chars().count();
+    if char_count <= max_len {
+        return text.to_string();
+    }
+    let truncated: String = text.chars().take(max_len.saturating_sub(3)).collect();
+    format!("{}...", truncated)
+}
+
+/// Renders the current player state, applying scroll/truncate per config.
+pub struct MprisModule;
+
+impl WaybarModule for MprisModule {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
+        let mpris = state.mpris.borrow().clone();
+
+        if mpris.is_stopped && mpris.title.is_empty() {
+            return Ok(WaybarOutput {
+                text: String::new(),
+                tooltip: None,
+                class: Some("stopped".to_string()),
+                percentage: None,
+            });
+        }
+
+        let (full_text, class) = format_mpris_text(&config.mpris.format, &mpris);
+
+        let text = if config.mpris.scroll {
+            if let Some(max_len) = config.mpris.max_length {
+                let scroll = state.mpris_scroll.read().await;
+                apply_scroll_window(
+                    &full_text,
+                    max_len,
+                    scroll.offset,
+                    &config.mpris.scroll_separator,
+                )
+            } else {
+                full_text.clone()
+            }
+        } else if let Some(max_len) = config.mpris.max_length {
+            truncate_with_ellipsis(&full_text, max_len)
+        } else {
+            full_text.clone()
+        };
+
+        Ok(WaybarOutput {
+            text,
+            tooltip: Some(format!("{} - {}", mpris.artist, mpris.title)),
+            class: Some(class.to_string()),
+            percentage: None,
+        })
+    }
+}
+
+/// Drive the marquee animation: advance the offset every `scroll_speed` ms
+/// while a track is playing, and emit a fresh generation on `tick_tx` so the
+/// mpris signaler arm fires. Resets offset when the track changes.
+pub async fn mpris_scroll_ticker(
+    config: Arc<RwLock<Config>>,
+    mut mpris_rx: watch::Receiver<MprisState>,
+    scroll_state: Arc<RwLock<MprisScrollState>>,
+    tick_tx: watch::Sender<u64>,
+) {
+    let mut generation: u64 = 0;
+    let mut last_track_key = String::new();
+
+    loop {
+        let mpris = mpris_rx.borrow_and_update().clone();
+        let cfg = config.read().await;
+        let scroll_enabled = cfg.mpris.scroll;
+        let has_max_length = cfg.mpris.max_length.is_some();
+        let scroll_speed = cfg.mpris.scroll_speed;
+        let format_str = cfg.mpris.format.clone();
+        drop(cfg);
+
+        let (full_text, _) = format_mpris_text(&format_str, &mpris);
+        let track_key = format!("{}|{}|{}", mpris.artist, mpris.title, mpris.album);
+
+        if track_key != last_track_key {
+            let mut state = scroll_state.write().await;
+            state.offset = 0;
+            state.full_text = full_text.clone();
+            last_track_key = track_key;
+            generation += 1;
+            let _ = tick_tx.send(generation);
+        }
+
+        if scroll_enabled && has_max_length && mpris.is_playing {
+            tokio::time::sleep(Duration::from_millis(scroll_speed)).await;
+            let mut state = scroll_state.write().await;
+            state.offset += 1;
+            state.full_text = full_text;
+            drop(state);
+            generation += 1;
+            let _ = tick_tx.send(generation);
+            continue;
+        }
+
+        // Not scrolling — sleep until the next player state change.
+        if mpris_rx.changed().await.is_err() {
+            break;
+        }
+    }
+}
+
+/// Background watcher that discovers the active MPRIS player and mirrors
+/// its `PlaybackStatus` + `Metadata` properties into [`MprisState`].
+pub struct MprisDaemon;
+
+#[proxy(
+    interface = "org.freedesktop.DBus",
+    default_service = "org.freedesktop.DBus",
+    default_path = "/org/freedesktop/DBus"
+)]
+trait DBus {
+    fn list_names(&self) -> zbus::Result<Vec<String>>;
+}
+
+#[proxy(
+    interface = "org.mpris.MediaPlayer2.Player",
+    default_path = "/org/mpris/MediaPlayer2"
+)]
+trait MprisPlayer {
+    #[zbus(property)]
+    fn playback_status(&self) -> zbus::Result<String>;
+
+    #[zbus(property)]
+    fn metadata(
+        &self,
+    ) -> zbus::Result<std::collections::HashMap<String, zbus::zvariant::Value<'_>>>;
+}
+
+impl MprisDaemon {
+    /// Construct a new (stateless) daemon.
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Spawn a supervised listen loop with a 5 s reconnect backoff.
+    pub fn start(&self, tx: watch::Sender<MprisState>) {
+        tokio::spawn(async move {
+            loop {
+                if let Err(e) = Self::listen_loop(&tx).await {
+                    debug!("MPRIS listener ended or error: {}", e);
+                    tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
+                }
+            }
+        });
+    }
+
+    async fn listen_loop(tx: &watch::Sender<MprisState>) -> anyhow::Result<()> {
+        use futures::StreamExt;
+
+        let connection = Connection::session().await?;
+        info!("Connected to D-Bus for MPRIS monitoring");
+
+        let dbus_proxy = DBusProxy::new(&connection).await?;
+
+        loop {
+            let names = dbus_proxy.list_names().await?;
+            let active_player = names
+                .into_iter()
+                .find(|n| n.starts_with("org.mpris.MediaPlayer2."));
+
+            let Some(player_name) = active_player else {
+                send_stopped_if_changed(tx);
+                tokio::time::sleep(Duration::from_secs(5)).await;
+                continue;
+            };
+
+            let player_proxy = match MprisPlayerProxy::builder(&connection)
+                .destination(player_name.clone())?
+                .build()
+                .await
+            {
+                Ok(p) => p,
+                Err(_) => {
+                    tokio::time::sleep(Duration::from_secs(2)).await;
+                    continue;
+                }
+            };
+
+            update_from_player(&player_proxy, tx).await;
+
+            let mut status_stream = player_proxy.receive_playback_status_changed().await;
+            let mut metadata_stream = player_proxy.receive_metadata_changed().await;
+
+            loop {
+                tokio::select! {
+                    Some(_) = status_stream.next() => {
+                        update_from_player(&player_proxy, tx).await;
+                    }
+                    Some(_) = metadata_stream.next() => {
+                        update_from_player(&player_proxy, tx).await;
+                    }
+                    _ = tokio::time::sleep(Duration::from_secs(10)) => {
+                        // Heartbeat: re-check that the player name is still owned.
+                        let current = dbus_proxy.list_names().await.unwrap_or_default();
+                        if !current.iter().any(|n| n == &player_name) {
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Fetch `PlaybackStatus` + `Metadata` and publish only when they differ
+/// from the previous [`MprisState`] (to avoid spurious watch wake-ups).
+async fn update_from_player(player: &MprisPlayerProxy<'_>, tx: &watch::Sender<MprisState>) {
+    let status = player.playback_status().await.unwrap_or_default();
+    let metadata = player.metadata().await.unwrap_or_default();
+
+    let is_playing = status == "Playing";
+    let is_paused = status == "Paused";
+    let is_stopped = status == "Stopped";
+
+    let (artist, title, album) = parse_metadata(&metadata);
+
+    let current = tx.borrow();
+    if current.is_playing != is_playing
+        || current.is_paused != is_paused
+        || current.is_stopped != is_stopped
+        || current.title != title
+        || current.artist != artist
+        || current.album != album
+    {
+        drop(current);
+        let _ = tx.send(MprisState {
+            is_playing,
+            is_paused,
+            is_stopped,
+            artist,
+            title,
+            album,
+        });
+    }
+}
+
+/// Extract `xesam:artist` (string or array), `xesam:title`, `xesam:album`.
+fn parse_metadata(
+    metadata: &std::collections::HashMap<String, zbus::zvariant::Value<'_>>,
+) -> (String, String, String) {
+    let mut artist = String::new();
+    let mut title = String::new();
+    let mut album = String::new();
+
+    if let Some(v) = metadata.get("xesam:artist") {
+        if let Ok(arr) = zbus::zvariant::Array::try_from(v) {
+            let mut artists = Vec::new();
+            for i in 0..arr.len() {
+                if let Ok(Some(s)) = arr.get::<&str>(i) {
+                    artists.push(s.to_string());
+                }
+            }
+            artist = artists.join(", ");
+        } else if let Ok(a) = <&str>::try_from(v) {
+            artist = a.to_string();
+        }
+    }
+    if let Some(v) = metadata.get("xesam:title")
+        && let Ok(t) = <&str>::try_from(v)
+    {
+        title = t.to_string();
+    }
+    if let Some(v) = metadata.get("xesam:album")
+        && let Ok(a) = <&str>::try_from(v)
+    {
+        album = a.to_string();
+    }
+
+    (artist, title, album)
+}
+
+/// Publish a cleared/stopped [`MprisState`] if the current state isn't already
+/// that. Called when no player is on the bus.
+fn send_stopped_if_changed(tx: &watch::Sender<MprisState>) {
+    let current = tx.borrow();
+    if !current.is_stopped || !current.title.is_empty() {
+        drop(current);
+        let _ = tx.send(MprisState {
+            is_playing: false,
+            is_paused: false,
+            is_stopped: true,
+            artist: String::new(),
+            title: String::new(),
+            album: String::new(),
+        });
+    }
+}

src/modules/network.rs

@@ -1,14 +1,25 @@
+//! Primary-interface throughput renderer + polling daemon.
+//!
+//! The daemon picks the interface with the longest-prefix default route (see
+//! [`get_primary_interface`]) and computes rx/tx rates as byte-count deltas
+//! between successive polls. Well-known VPN interface prefixes get a lock
+//! glyph prepended to the rendered text.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::{AppReceivers, NetworkState};
 use crate::utils::{TokenValue, format_template};
-use anyhow::Result;
+use nix::ifaddrs::getifaddrs;
 use std::fs;
 use std::time::{SystemTime, UNIX_EPOCH};
+use tokio::sync::watch;
 
+/// Renders interface / IP / rx / tx for the detected primary route.
 pub struct NetworkModule;
 
+/// Background poller that tracks byte counters across ticks to derive rates.
 pub struct NetworkDaemon {
     last_time: u64,
     last_rx_bytes: u64,
@@ -17,7 +28,10 @@ pub struct NetworkDaemon {
     cached_ip: Option<String>,
 }
 
+type PollResult = crate::error::Result<(String, Option<String>, Option<(u64, u64)>)>;
+
 impl NetworkDaemon {
+    /// Build a fresh daemon with no prior byte-count samples.
     pub fn new() -> Self {
         Self {
             last_time: 0,
@@ -28,31 +42,64 @@ impl NetworkDaemon {
         }
     }
 
-    pub fn poll(&mut self, state: SharedState) {
+    /// Detect the primary interface, read `/sys/class/net/*/statistics`, and
-        // Cache invalidation: if the interface directory doesn't exist, clear cache
+    /// publish a new [`NetworkState`] onto `state_tx`. Interface/byte reads
-        if let Some(ref iface) = self.cached_interface
+    /// run via [`tokio::task::spawn_blocking`] so the runtime isn't starved.
-            && !std::path::Path::new(&format!("/sys/class/net/{}", iface)).exists()
+    pub async fn poll(
-        {
+        &mut self,
+        state_tx: &watch::Sender<NetworkState>,
+    ) -> crate::error::Result<()> {
+        let (iface, ip_opt, bytes_opt) = tokio::task::spawn_blocking(|| -> PollResult {
+            let iface = get_primary_interface()?;
+            if iface.is_empty() {
+                return Ok((String::new(), None, None));
+            }
+            let ip = get_ip_address(&iface);
+            let bytes = get_bytes(&iface).ok();
+            Ok((iface, ip, bytes))
+        })
+        .await
+        .map_err(|e| crate::error::FluxoError::System(e.to_string()))??;
+
+        if !iface.is_empty() {
+            if self.cached_interface.as_ref() != Some(&iface) || self.cached_ip.is_none() {
+                self.cached_ip = ip_opt;
+                self.cached_interface = Some(iface.clone());
+            }
+        } else {
             self.cached_interface = None;
             self.cached_ip = None;
+            let mut network = state_tx.borrow().clone();
+            network.interface.clear();
+            network.ip.clear();
+            network.rx_mbps = 0.0;
+            network.tx_mbps = 0.0;
+            let _ = state_tx.send(network);
+            return Err(crate::error::FluxoError::Network(
+                "No primary interface found".into(),
+            ));
         }
 
-        // Re-detect interface if needed
+        let interface = if let Some(ref interface) = self.cached_interface {
-        if self.cached_interface.is_none()
+            interface.clone()
-            && let Ok(iface) = get_primary_interface()
+        } else {
-            && !iface.is_empty()
+            let mut network = state_tx.borrow().clone();
-        {
+            network.interface.clear();
-            self.cached_ip = get_ip_address(&iface);
+            network.ip.clear();
-            self.cached_interface = Some(iface);
+            network.rx_mbps = 0.0;
-        }
+            network.tx_mbps = 0.0;
+            let _ = state_tx.send(network);
+            return Err(crate::error::FluxoError::Network(
+                "Interface disappeared during poll".into(),
+            ));
+        };
 
-        if let Some(ref interface) = self.cached_interface {
         let time_now = SystemTime::now()
             .duration_since(UNIX_EPOCH)
             .unwrap_or_default()
             .as_secs();
 
-            if let Ok((rx_bytes_now, tx_bytes_now)) = get_bytes(interface) {
+        if let Some((rx_bytes_now, tx_bytes_now)) = bytes_opt {
             if self.last_time > 0 && time_now > self.last_time {
                 let time_diff = (time_now - self.last_time) as f64;
                 let rx_mbps = (rx_bytes_now.saturating_sub(self.last_rx_bytes)) as f64
@@ -64,49 +111,45 @@ impl NetworkDaemon {
                     / 1024.0
                     / 1024.0;
 
-                    if let Ok(mut state_lock) = state.write() {
+                let mut network = state_tx.borrow().clone();
-                        state_lock.network.rx_mbps = rx_mbps;
+                network.rx_mbps = rx_mbps;
-                        state_lock.network.tx_mbps = tx_mbps;
+                network.tx_mbps = tx_mbps;
-                        state_lock.network.interface = interface.clone();
+                network.interface = interface.clone();
-                        state_lock.network.ip = self.cached_ip.clone().unwrap_or_default();
+                network.ip = self.cached_ip.clone().unwrap_or_default();
-                    }
+                let _ = state_tx.send(network);
-                } else if let Ok(mut state_lock) = state.write() {
+            } else {
-                    // First poll: no speed data yet, but update interface/ip
+                // First poll has no prior sample — publish iface/ip only.
-                    state_lock.network.interface = interface.clone();
+                let mut network = state_tx.borrow().clone();
-                    state_lock.network.ip = self.cached_ip.clone().unwrap_or_default();
+                network.interface = interface.clone();
+                network.ip = self.cached_ip.clone().unwrap_or_default();
+                let _ = state_tx.send(network);
             }
 
             self.last_time = time_now;
             self.last_rx_bytes = rx_bytes_now;
             self.last_tx_bytes = tx_bytes_now;
         } else {
-                // Read failed, might be down
             self.cached_interface = None;
+            return Err(crate::error::FluxoError::Network(format!(
+                "Failed to read bytes for {}",
+                interface
+            )));
         }
-        } else if let Ok(mut state_lock) = state.write() {
+
-            // No interface detected
+        Ok(())
-            state_lock.network.interface.clear();
-            state_lock.network.ip.clear();
-        }
     }
 }
 
 impl WaybarModule for NetworkModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
-        let (interface, ip, rx_mbps, tx_mbps) = if let Ok(s) = state.read() {
+        &self,
-            (
+        config: &Config,
-                s.network.interface.clone(),
+        state: &AppReceivers,
-                s.network.ip.clone(),
+        _args: &[&str],
-                s.network.rx_mbps,
+    ) -> Result<WaybarOutput> {
-                s.network.tx_mbps,
+        let (interface, ip, rx_mbps, tx_mbps) = {
-            )
+            let s = state.network.borrow();
-        } else {
+            (s.interface.clone(), s.ip.clone(), s.rx_mbps, s.tx_mbps)
-            return Ok(WaybarOutput {
-                text: "No connection".to_string(),
-                tooltip: None,
-                class: None,
-                percentage: None,
-            });
         };
 
         if interface.is_empty() {
@@ -123,8 +166,8 @@ impl WaybarModule for NetworkModule {
         let mut output_text = format_template(
             &config.network.format,
             &[
-                ("interface", TokenValue::String(&interface)),
+                ("interface", TokenValue::String(interface.clone())),
-                ("ip", TokenValue::String(ip_display)),
+                ("ip", TokenValue::String(ip_display.to_string())),
                 ("rx", TokenValue::Float(rx_mbps)),
                 ("tx", TokenValue::Float(tx_mbps)),
             ],
@@ -134,6 +177,8 @@ impl WaybarModule for NetworkModule {
             || interface.starts_with("wg")
             || interface.starts_with("ppp")
             || interface.starts_with("pvpn")
+            || interface.starts_with("proton")
+            || interface.starts_with("ipsec")
         {
             output_text = format!("  {}", output_text);
         }
@@ -147,59 +192,49 @@ impl WaybarModule for NetworkModule {
     }
 }
 
+/// Parse `/proc/net/route` to find the default-route interface. When several
+/// defaults exist, prefer the one with the longest netmask, then lowest metric.
 fn get_primary_interface() -> Result<String> {
-    let output = std::process::Command::new("ip")
+    let content = std::fs::read_to_string("/proc/net/route")?;
-        .args(["route", "list"])
-        .output()?;
-    let stdout = String::from_utf8_lossy(&output.stdout);
 
     let mut defaults = Vec::new();
-    for line in stdout.lines() {
+    for line in content.lines().skip(1) {
-        if line.starts_with("default") {
         let parts: Vec<&str> = line.split_whitespace().collect();
-            let mut dev = "";
+        if parts.len() >= 8 {
-            let mut metric = 0;
+            let iface = parts[0];
-            for i in 0..parts.len() {
+            let dest = parts[1];
-                if parts[i] == "dev" && i + 1 < parts.len() {
+            let metric = parts[6].parse::<i32>().unwrap_or(0);
-                    dev = parts[i + 1];
+            let mask = u32::from_str_radix(parts[7], 16).unwrap_or(0);
-                }
+
-                if parts[i] == "metric" && i + 1 < parts.len() {
+            if dest == "00000000" {
-                    metric = parts[i + 1].parse::<i32>().unwrap_or(0);
+                defaults.push((mask, metric, iface.to_string()));
-                }
-            }
-            if !dev.is_empty() {
-                defaults.push((metric, dev.to_string()));
             }
         }
     }
 
-    defaults.sort_by_key(|k| k.0);
+    defaults.sort_by(|a, b| b.0.cmp(&a.0).then(a.1.cmp(&b.1)));
-    if let Some((_, dev)) = defaults.first() {
+    if let Some((_, _, dev)) = defaults.first() {
         Ok(dev.clone())
     } else {
         Ok(String::new())
     }
 }
 
+/// First IPv4 address for `interface`, via `getifaddrs`. `None` if absent.
 fn get_ip_address(interface: &str) -> Option<String> {
-    let output = std::process::Command::new("ip")
+    let addrs = getifaddrs().ok()?;
-        .args(["-4", "addr", "show", interface])
+    for ifaddr in addrs {
-        .output()
+        if ifaddr.interface_name == interface
-        .ok()?;
+            && let Some(address) = ifaddr.address
-    let stdout = String::from_utf8_lossy(&output.stdout);
+            && let Some(sockaddr) = address.as_sockaddr_in()
-    for line in stdout.lines() {
+        {
-        if line.trim().starts_with("inet ") {
+            return Some(sockaddr.ip().to_string());
-            let parts: Vec<&str> = line.split_whitespace().collect();
-            if parts.len() > 1 {
-                let ip_cidr = parts[1];
-                let ip = ip_cidr.split('/').next().unwrap_or(ip_cidr);
-                return Some(ip.to_string());
-            }
         }
     }
     None
 }
 
+/// Read `(rx_bytes, tx_bytes)` counters from sysfs for `interface`.
 fn get_bytes(interface: &str) -> Result<(u64, u64)> {
     let rx_path = format!("/sys/class/net/{}/statistics/rx_bytes", interface);
     let tx_path = format!("/sys/class/net/{}/statistics/tx_bytes", interface);
@@ -217,3 +252,80 @@ fn get_bytes(interface: &str) -> Result<(u64, u64)> {
 
     Ok((rx, tx))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::state::{AppState, NetworkState, mock_state};
+
+    #[tokio::test]
+    async fn test_network_no_connection() {
+        let state = mock_state(AppState::default());
+        let config = Config::default();
+        let output = NetworkModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert_eq!(output.text, "No connection");
+    }
+
+    #[tokio::test]
+    async fn test_network_connected() {
+        let state = mock_state(AppState {
+            network: NetworkState {
+                rx_mbps: 1.5,
+                tx_mbps: 0.3,
+                interface: "eth0".to_string(),
+                ip: "192.168.1.100".to_string(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = NetworkModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert!(output.text.contains("eth0"));
+        assert!(output.text.contains("192.168.1.100"));
+        assert!(output.text.contains("1.50"));
+        assert_eq!(output.class.as_deref(), Some("eth0"));
+    }
+
+    #[tokio::test]
+    async fn test_network_vpn_prefix() {
+        let state = mock_state(AppState {
+            network: NetworkState {
+                rx_mbps: 0.0,
+                tx_mbps: 0.0,
+                interface: "wg0".to_string(),
+                ip: "10.0.0.1".to_string(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = NetworkModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert!(output.text.starts_with("  "));
+    }
+
+    #[tokio::test]
+    async fn test_network_no_ip() {
+        let state = mock_state(AppState {
+            network: NetworkState {
+                rx_mbps: 0.0,
+                tx_mbps: 0.0,
+                interface: "eth0".to_string(),
+                ip: String::new(),
+            },
+            ..Default::default()
+        });
+        let config = Config::default();
+        let output = NetworkModule
+            .run(&config, &state.receivers, &[])
+            .await
+            .unwrap();
+        assert!(output.text.contains("No IP"));
+    }
+}

src/modules/power.rs

@@ -1,19 +1,27 @@
+//! Battery/AC indicator via `/sys/class/power_supply`. Dispatch-only - reads
+//! sysfs on demand rather than polling into a watch channel.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
 use crate::utils::{TokenValue, format_template};
-use anyhow::Result;
 use std::fs;
 
+/// Renders battery percentage + charge state (critical/warning/bat/charging/ac).
 pub struct PowerModule;
 
 impl WaybarModule for PowerModule {
-    fn run(&self, config: &Config, _state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        _state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
         let critical_threshold = 15;
         let warning_threshold = 50;
 
-        // Find the first battery
         let mut battery_path = None;
         if let Ok(entries) = fs::read_dir("/sys/class/power_supply") {
             for entry in entries.flatten() {
@@ -25,7 +33,6 @@ impl WaybarModule for PowerModule {
             }
         }
 
-        // Check AC status
         let mut ac_online = false;
         if let Ok(entries) = fs::read_dir("/sys/class/power_supply") {
             for entry in entries.flatten() {
@@ -96,7 +103,7 @@ impl WaybarModule for PowerModule {
             &config.power.format,
             &[
                 ("percentage", TokenValue::Int(percentage as i64)),
-                ("icon", TokenValue::String(icon)),
+                ("icon", TokenValue::String(icon.to_string())),
             ],
         );
 

src/modules/sys.rs

@@ -1,26 +1,31 @@
+//! Uptime + load average renderer. Reads from the `sys` watch channel.
+
 use crate::config::Config;
+use crate::error::Result;
 use crate::modules::WaybarModule;
 use crate::output::WaybarOutput;
-use crate::state::SharedState;
+use crate::state::AppReceivers;
 use crate::utils::{TokenValue, format_template};
-use anyhow::Result;
 
+/// Renders uptime and load averages with a detailed tooltip.
 pub struct SysModule;
 
 impl WaybarModule for SysModule {
-    fn run(&self, config: &Config, state: &SharedState, _args: &[&str]) -> Result<WaybarOutput> {
+    async fn run(
+        &self,
+        config: &Config,
+        state: &AppReceivers,
+        _args: &[&str],
+    ) -> Result<WaybarOutput> {
         let (load1, load5, load15, uptime_secs, process_count) = {
-            if let Ok(state_lock) = state.read() {
+            let state_lock = state.sys.borrow();
             (
-                    state_lock.sys.load_1,
+                state_lock.load_1,
-                    state_lock.sys.load_5,
+                state_lock.load_5,
-                    state_lock.sys.load_15,
+                state_lock.load_15,
-                    state_lock.sys.uptime,
+                state_lock.uptime,
-                    state_lock.sys.process_count,
+                state_lock.process_count,
             )
-            } else {
-                (0.0, 0.0, 0.0, 0, 0)
-            }
         };
 
         let hours = uptime_secs / 3600;
@@ -34,7 +39,7 @@ impl WaybarModule for SysModule {
         let text = format_template(
             &config.sys.format,
             &[
-                ("uptime", TokenValue::String(&uptime_str)),
+                ("uptime", TokenValue::String(uptime_str.clone())),
                 ("load1", TokenValue::Float(load1)),
                 ("load5", TokenValue::Float(load5)),
                 ("load15", TokenValue::Float(load15)),

src/output.rs

@@ -1,12 +1,149 @@
-use serde::Serialize;
+//! JSON payload returned to Waybar custom modules, plus client-side
+//! output formatting utilities.
 
-#[derive(Serialize)]
+use serde::{Deserialize, Serialize};
+
+/// Waybar renders in a proportional font — replacing normal spaces with
+/// figure-spaces (U+2007) keeps column widths stable across updates.
+pub const FIGURE_SPACE: char = '\u{2007}';
+
+/// Zero-width space used as cosmetic padding around module text so Waybar
+/// doesn't clip leading/trailing glyphs.
+pub const ZERO_WIDTH_SPACE: char = '\u{200B}';
+
+/// A Waybar custom module return value.
+///
+/// Serialises to the schema Waybar's `return-type: json` expects — the
+/// optional fields are omitted from the output when unset.
+#[derive(Serialize, Deserialize, Clone, Debug, Default)]
 pub struct WaybarOutput {
+    /// Primary text shown in the bar.
     pub text: String,
+    /// Tooltip text shown on hover.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub tooltip: Option<String>,
+    /// CSS class applied to the module (for styling).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub class: Option<String>,
+    /// Optional 0-100 value usable by bar progress indicators.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub percentage: Option<u8>,
 }
+
+impl WaybarOutput {
+    /// A blank output for disabled modules.
+    pub fn disabled() -> Self {
+        Self {
+            text: String::new(),
+            tooltip: Some("Module disabled".to_string()),
+            class: Some("disabled".to_string()),
+            percentage: None,
+        }
+    }
+
+    /// A user-visible error with tooltip detail.
+    pub fn error(message: &str) -> Self {
+        Self {
+            text: format!("{}Error{}", ZERO_WIDTH_SPACE, ZERO_WIDTH_SPACE),
+            tooltip: Some(message.to_string()),
+            class: Some("error".to_string()),
+            percentage: None,
+        }
+    }
+}
+
+/// Apply Waybar font-stabilisation to a text string.
+///
+/// Replaces normal spaces with figure-spaces (unless the string contains
+/// markup), and wraps in zero-width spaces for cosmetic padding.
+pub fn stabilize_text(text: &str) -> String {
+    let processed = if text.contains('<') {
+        text.to_string()
+    } else {
+        text.replace(' ', &FIGURE_SPACE.to_string())
+    };
+    format!("{}{}{}", ZERO_WIDTH_SPACE, processed, ZERO_WIDTH_SPACE)
+}
+
+/// Process an IPC response and print Waybar-compatible JSON to stdout.
+///
+/// On IPC failure, prints a "Daemon offline" error output and exits
+/// non-zero so Waybar surfaces the problem visually.
+pub fn print_waybar_response(response: anyhow::Result<String>) {
+    match response {
+        Ok(json_str) => match serde_json::from_str::<serde_json::Value>(&json_str) {
+            Ok(mut val) => {
+                if let Some(text) = val.get("text").and_then(|t| t.as_str()) {
+                    val["text"] = serde_json::Value::String(stabilize_text(text));
+                }
+                println!("{}", serde_json::to_string(&val).unwrap());
+            }
+            Err(_) => println!("{}", json_str),
+        },
+        Err(e) => {
+            let err_out = WaybarOutput {
+                text: format!(
+                    "{}Daemon offline ({}){}",
+                    ZERO_WIDTH_SPACE, e, ZERO_WIDTH_SPACE
+                ),
+                tooltip: Some(e.to_string()),
+                class: Some("error".to_string()),
+                percentage: None,
+            };
+            println!("{}", serde_json::to_string(&err_out).unwrap());
+            std::process::exit(1);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_full_output_serialization() {
+        let output = WaybarOutput {
+            text: "CPU: 50%".to_string(),
+            tooltip: Some("Details".to_string()),
+            class: Some("normal".to_string()),
+            percentage: Some(50),
+        };
+        let json = serde_json::to_string(&output).unwrap();
+        let val: serde_json::Value = serde_json::from_str(&json).unwrap();
+        assert_eq!(val["text"], "CPU: 50%");
+        assert_eq!(val["tooltip"], "Details");
+        assert_eq!(val["class"], "normal");
+        assert_eq!(val["percentage"], 50);
+    }
+
+    #[test]
+    fn test_optional_fields_omitted() {
+        let output = WaybarOutput {
+            text: "test".to_string(),
+            tooltip: None,
+            class: None,
+            percentage: None,
+        };
+        let json = serde_json::to_string(&output).unwrap();
+        let val: serde_json::Value = serde_json::from_str(&json).unwrap();
+        assert_eq!(val["text"], "test");
+        assert!(val.get("tooltip").is_none());
+        assert!(val.get("class").is_none());
+        assert!(val.get("percentage").is_none());
+    }
+
+    #[test]
+    fn test_partial_optional_fields() {
+        let output = WaybarOutput {
+            text: "test".to_string(),
+            tooltip: Some("tip".to_string()),
+            class: None,
+            percentage: Some(75),
+        };
+        let json = serde_json::to_string(&output).unwrap();
+        let val: serde_json::Value = serde_json::from_str(&json).unwrap();
+        assert_eq!(val["tooltip"], "tip");
+        assert!(val.get("class").is_none());
+        assert_eq!(val["percentage"], 75);
+    }
+}

src/registry.rs

@@ -0,0 +1,85 @@
+//! Central module dispatch: name → [`WaybarModule::run`] lookup.
+//!
+//! The `dispatch` function is called by the IPC request handler with a module
+//! name (e.g. `"cpu"`, `"vol"`) and returns the rendered [`WaybarOutput`]. All
+//! per-module match arms are generated by [`for_each_watched_module!`];
+//! dispatch-only modules without a watch channel (power/game/btrfs) are
+//! listed manually.
+
+use crate::config::Config;
+use crate::error::{FluxoError, Result as FluxoResult};
+use crate::output::WaybarOutput;
+use crate::state::AppReceivers;
+
+#[allow(unused_imports)]
+use crate::modules::WaybarModule;
+
+/// Expands the module registry into a single [`dispatch`] match and a
+/// [`signaler_default_args`] lookup.
+macro_rules! gen_dispatch {
+    ($( { $feature:literal, $field:ident, $state:ty, [$($name:literal),+], [$($sig_name:literal),+], $module:path, $signal:ident, [$($default_arg:literal),*], $config:ident } )*) => {
+        /// Look up a module by name and render its [`WaybarOutput`].
+        ///
+        /// Returns [`FluxoError::Disabled`] when the module is disabled in
+        /// config, and [`FluxoError::Ipc`] when the name is unknown.
+        pub async fn dispatch(
+            module_name: &str,
+            #[allow(unused)] config: &Config,
+            #[allow(unused)] state: &AppReceivers,
+            #[allow(unused)] args: &[&str],
+        ) -> FluxoResult<WaybarOutput> {
+            if !config.is_module_enabled(module_name) {
+                return Err(FluxoError::Disabled(module_name.to_string()));
+            }
+
+            match module_name {
+                $(
+                    #[cfg(feature = $feature)]
+                    $($name)|+ => {
+                        $module.run(config, state, args).await
+                    }
+                )*
+
+                // Dispatch-only modules (no watch channel)
+                #[cfg(feature = "mod-audio")]
+                "mic" => {
+                    crate::modules::audio::AudioModule
+                        .run(config, state, args)
+                        .await
+                }
+                #[cfg(feature = "mod-hardware")]
+                "power" => {
+                    crate::modules::power::PowerModule
+                        .run(config, state, args)
+                        .await
+                }
+                #[cfg(feature = "mod-hardware")]
+                "game" => {
+                    crate::modules::game::GameModule
+                        .run(config, state, args)
+                        .await
+                }
+                #[cfg(feature = "mod-hardware")]
+                "pool" | "btrfs" => {
+                    crate::modules::btrfs::BtrfsModule
+                        .run(config, state, args)
+                        .await
+                }
+                _ => Err(FluxoError::Ipc(format!("Unknown module: {}", module_name))),
+            }
+        }
+
+        /// Returns the default args used by the signaler when evaluating a module.
+        pub fn signaler_default_args(module_name: &str) -> &'static [&'static str] {
+            match module_name {
+                $(
+                    $($name)|+ => &[$($default_arg),*],
+                )*
+                "mic" => &["source", "show"],
+                _ => &[],
+            }
+        }
+    };
+}
+
+for_each_watched_module!(gen_dispatch);

src/signaler.rs

@@ -0,0 +1,163 @@
+//! Waybar signalling: watch state channels, send `SIGRTMIN+N` on changes.
+//!
+//! Waybar's custom modules use `signal = N` to rerun their command when they
+//! receive `SIGRTMIN+N`. This task subscribes to every watched module's
+//! `watch::Receiver`, evaluates the module when its channel fires, and only
+//! signals Waybar when the rendered output actually changed. A 50 ms per-signal
+//! debounce prevents storms during rapid state churn.
+
+use crate::config::Config;
+use crate::state::AppReceivers;
+use std::collections::HashMap;
+use std::sync::Arc;
+use sysinfo::{ProcessesToUpdate, System};
+use tokio::sync::RwLock;
+use tokio::time::{Duration, Instant, sleep};
+use tracing::{debug, warn};
+
+/// Sends real-time signals to the Waybar process.
+///
+/// Resolves Waybar's PID lazily and caches it — the PID is invalidated on
+/// signal failure (e.g. Waybar was restarted) and rediscovered via `sysinfo`.
+pub struct WaybarSignaler {
+    cached_pid: Option<i32>,
+    sys: System,
+    last_signal_sent: HashMap<i32, Instant>,
+}
+
+impl WaybarSignaler {
+    /// Create a new signaler with no cached PID.
+    pub fn new() -> Self {
+        Self {
+            cached_pid: None,
+            sys: System::new(),
+            last_signal_sent: HashMap::new(),
+        }
+    }
+
+    fn find_waybar_pid(&mut self) -> Option<i32> {
+        self.sys.refresh_processes(ProcessesToUpdate::All, true);
+        for (pid, process) in self.sys.processes() {
+            if process.name() == "waybar" {
+                return Some(pid.as_u32() as i32);
+            }
+        }
+        None
+    }
+
+    fn send_signal(&mut self, signal_num: i32) {
+        if let Some(last) = self.last_signal_sent.get(&signal_num)
+            && last.elapsed() < Duration::from_millis(50)
+        {
+            return;
+        }
+
+        let mut valid_pid = false;
+        if let Some(pid) = self.cached_pid
+            && unsafe { libc::kill(pid, 0) } == 0
+        {
+            valid_pid = true;
+        }
+
+        if !valid_pid {
+            self.cached_pid = self.find_waybar_pid();
+        }
+
+        if let Some(pid) = self.cached_pid {
+            let sig = libc::SIGRTMIN() + signal_num;
+            if unsafe { libc::kill(pid, sig) } == 0 {
+                debug!("Sent SIGRTMIN+{} to waybar (PID: {})", signal_num, pid);
+                self.last_signal_sent.insert(signal_num, Instant::now());
+            } else {
+                warn!("Failed to send SIGRTMIN+{} to waybar", signal_num);
+                self.cached_pid = None;
+            }
+        } else {
+            debug!("Waybar process not found, skipping signal.");
+        }
+    }
+}
+
+/// Generates [`WaybarSignaler::run`] from the central module registry.
+///
+/// For each watched module we emit:
+/// * a cfg-gated `watch::Receiver::changed()` future (or `pending::<()>` when
+///   the feature is disabled, so the `tokio::select!` arm compiles uniformly),
+/// * a `select!` arm that re-evaluates the module and signals Waybar once per
+///   changed output.
+macro_rules! gen_signaler_run {
+    ($( { $feature:literal, $field:ident, $state:ty, [$($name:literal),+], [$($sig_name:literal),+], $module:path, $signal:ident, [$($default_arg:literal),*], $config:ident } )*) => {
+        impl WaybarSignaler {
+            /// Run the signaler event loop forever.
+            ///
+            /// Consumes `self`; intended to be spawned as a long-lived task.
+            pub async fn run(mut self, config_lock: Arc<RwLock<Config>>, mut receivers: AppReceivers) {
+                let mut last_outputs: HashMap<&'static str, String> = HashMap::new();
+
+                loop {
+                    let signals = config_lock.read().await.signals.clone();
+
+                    macro_rules! check_and_signal {
+                        ($module_name:expr, $signal_opt:expr) => {
+                            if let Some(sig) = $signal_opt {
+                                let config = config_lock.read().await;
+                                if let Some(out) = crate::daemon::evaluate_module_for_signaler(
+                                    $module_name,
+                                    &receivers,
+                                    &config,
+                                )
+                                .await
+                                {
+                                    if last_outputs.get($module_name) != Some(&out) {
+                                        last_outputs.insert($module_name, out);
+                                        self.send_signal(sig);
+                                    }
+                                }
+                            }
+                        };
+                    }
+
+                    // Generate cfg-gated futures for each watched module
+                    $(
+                        #[cfg(not(feature = $feature))]
+                        let $field = std::future::pending::<
+                            std::result::Result<(), tokio::sync::watch::error::RecvError>,
+                        >();
+                        #[cfg(feature = $feature)]
+                        let $field = receivers.$field.changed();
+                    )*
+
+                    // MPRIS scroll tick (special case — not a watched module)
+                    #[cfg(not(feature = "mod-dbus"))]
+                    let mpris_scroll_tick = std::future::pending::<
+                        std::result::Result<(), tokio::sync::watch::error::RecvError>,
+                    >();
+                    #[cfg(feature = "mod-dbus")]
+                    let mpris_scroll_tick = receivers.mpris_scroll_tick.changed();
+
+                    tokio::select! {
+                        $(
+                            res = $field, if signals.$signal.is_some() => {
+                                if res.is_ok() {
+                                    $(check_and_signal!($sig_name, signals.$signal);)+
+                                }
+                            }
+                        )*
+
+                        // MPRIS scroll tick (separate from mpris data changes)
+                        res = mpris_scroll_tick, if signals.mpris.is_some() => {
+                            if res.is_ok()
+                                && let Some(sig) = signals.mpris { self.send_signal(sig); }
+                        }
+
+                        _ = sleep(Duration::from_secs(5)) => {
+                            // heartbeat: re-read signals config on each iteration
+                        }
+                    }
+                }
+            }
+        }
+    };
+}
+
+for_each_watched_module!(gen_signaler_run);

src/state.rs

@@ -1,15 +1,108 @@
-use std::sync::{Arc, RwLock};
+//! Shared state types exchanged between daemon tasks and modules.
+//!
+//! Every "watched" module has a `watch::Receiver<StateType>` held by
+//! [`AppReceivers`]; background tasks write into the paired sender. Readers
+//! (the request handler, the signaler) take a cheap snapshot via
+//! `Receiver::borrow()` and render their output from it.
 
-#[derive(Default, Clone)]
+use crate::output::WaybarOutput;
-pub struct AppState {
+use std::collections::HashMap;
-    pub network: NetworkState,
+use std::sync::Arc;
-    pub cpu: CpuState,
+use tokio::sync::{RwLock, mpsc, watch};
-    pub memory: MemoryState,
+use tokio::time::Instant;
-    pub sys: SysState,
+
-    pub gpu: GpuState,
+/// Generates the [`AppReceivers`] struct, with one `watch::Receiver` field
-    pub disks: Vec<DiskInfo>,
+/// per watched module (cfg-gated by feature flag).
+macro_rules! gen_app_receivers {
+    ($( { $feature:literal, $field:ident, $state:ty, [$($name:literal),+], [$($sig_name:literal),+], $module:path, $signal:ident, [$($default_arg:literal),*], $config:ident } )*) => {
+        /// Bundle of every watch-channel receiver and control-channel handle.
+        ///
+        /// Cloned into each IPC request handler and each module daemon so that
+        /// they can snapshot state without locking. Per-module receivers are
+        /// generated from [`for_each_watched_module!`]; the remaining fields
+        /// (`health`, `bt_cycle`, `audio_cmd_tx`, `mpris_scroll_*`) are shared
+        /// control state.
+        #[derive(Clone)]
+        pub struct AppReceivers {
+            $(
+                #[cfg(feature = $feature)]
+                pub $field: watch::Receiver<$state>,
+            )*
+            #[cfg(feature = "mod-bt")]
+            pub bt_cycle: Arc<RwLock<usize>>,
+            #[cfg(feature = "mod-dbus")]
+            pub mpris_scroll: Arc<RwLock<MprisScrollState>>,
+            #[cfg(feature = "mod-dbus")]
+            pub mpris_scroll_tick: watch::Receiver<u64>,
+            pub health: Arc<RwLock<HashMap<String, ModuleHealth>>>,
+            #[cfg(feature = "mod-bt")]
+            pub bt_force_poll: mpsc::Sender<()>,
+            #[cfg(feature = "mod-audio")]
+            pub audio_cmd_tx: mpsc::Sender<crate::modules::audio::AudioCommand>,
+        }
+    };
+}
+for_each_watched_module!(gen_app_receivers);
+
+/// Runtime health statistics used for backoff decisions.
+#[derive(Clone, Default)]
+pub struct ModuleHealth {
+    pub consecutive_failures: u32,
+    pub last_failure: Option<Instant>,
+    pub backoff_until: Option<Instant>,
+    pub last_successful_output: Option<WaybarOutput>,
 }
 
+/// Current default audio sink + source plus all available devices.
+#[derive(Default, Clone)]
+pub struct AudioState {
+    pub sink: AudioDeviceInfo,
+    pub source: AudioDeviceInfo,
+    pub available_sinks: Vec<String>,
+    pub available_sources: Vec<String>,
+}
+
+/// Metadata for one PulseAudio sink or source.
+#[derive(Default, Clone)]
+pub struct AudioDeviceInfo {
+    pub name: String,
+    pub description: String,
+    pub volume: u8,
+    pub muted: bool,
+    pub channels: u8,
+}
+
+/// A single BlueZ device, optionally annotated by a plugin (buds, maestro…).
+#[derive(Default, Clone)]
+pub struct BtDeviceInfo {
+    pub device_alias: String,
+    pub device_address: String,
+    pub battery_percentage: Option<u8>,
+    pub plugin_data: Vec<(String, String)>,
+}
+
+/// Snapshot of the Bluetooth adapter plus every tracked device.
+#[derive(Default, Clone)]
+pub struct BtState {
+    pub adapter_powered: bool,
+    pub devices: Vec<BtDeviceInfo>,
+}
+
+impl BtState {
+    /// Return the device the client is currently cycled to, if any.
+    ///
+    /// The `index` is taken modulo `devices.len()` so cycling past the end
+    /// wraps around naturally.
+    pub fn active_device(&self, index: usize) -> Option<&BtDeviceInfo> {
+        if self.devices.is_empty() {
+            None
+        } else {
+            Some(&self.devices[index % self.devices.len()])
+        }
+    }
+}
+
+/// Per-mountpoint disk usage.
 #[derive(Default, Clone)]
 pub struct DiskInfo {
     pub mount_point: String,
@@ -18,6 +111,7 @@ pub struct DiskInfo {
     pub available_bytes: u64,
 }
 
+/// Throughput and identity of the active network interface.
 #[derive(Default, Clone)]
 pub struct NetworkState {
     pub rx_mbps: f64,
@@ -26,6 +120,7 @@ pub struct NetworkState {
     pub ip: String,
 }
 
+/// CPU utilisation and temperature.
 #[derive(Clone)]
 pub struct CpuState {
     pub usage: f64,
@@ -43,12 +138,14 @@ impl Default for CpuState {
     }
 }
 
+/// RAM usage in gigabytes.
 #[derive(Default, Clone)]
 pub struct MemoryState {
     pub used_gb: f64,
     pub total_gb: f64,
 }
 
+/// Load averages, uptime, and process count.
 #[derive(Default, Clone)]
 pub struct SysState {
     pub load_1: f64,
@@ -58,6 +155,9 @@ pub struct SysState {
     pub process_count: usize,
 }
 
+/// GPU snapshot (vendor-agnostic).
+///
+/// `active` is `false` until detection finds a supported GPU.
 #[derive(Clone)]
 pub struct GpuState {
     pub active: bool,
@@ -83,4 +183,202 @@ impl Default for GpuState {
     }
 }
 
-pub type SharedState = Arc<RwLock<AppState>>;
+/// Do-Not-Disturb toggle state.
+#[derive(Default, Clone)]
+pub struct DndState {
+    pub is_dnd: bool,
+}
+
+/// Currently active keyboard layout.
+#[derive(Default, Clone)]
+pub struct KeyboardState {
+    pub layout: String,
+}
+
+/// Display backlight brightness as a 0-100 percentage.
+#[derive(Default, Clone)]
+pub struct BacklightState {
+    pub percentage: u8,
+}
+
+/// Marquee scroll position for the MPRIS module.
+#[derive(Default, Clone)]
+pub struct MprisScrollState {
+    pub offset: usize,
+    pub full_text: String,
+}
+
+/// Currently playing media metadata from an MPRIS player.
+#[derive(Default, Clone)]
+pub struct MprisState {
+    pub is_playing: bool,
+    pub is_paused: bool,
+    pub is_stopped: bool,
+    pub artist: String,
+    pub title: String,
+    pub album: String,
+}
+
+/// Test harness holding a synthetic [`AppReceivers`] plus its senders.
+///
+/// The senders are kept alive via `_*_tx` fields so test code can drive the
+/// watch channels without them being dropped.
+#[cfg(test)]
+pub struct MockState {
+    pub receivers: AppReceivers,
+    #[cfg(feature = "mod-network")]
+    _net_tx: watch::Sender<NetworkState>,
+    #[cfg(feature = "mod-hardware")]
+    _cpu_tx: watch::Sender<CpuState>,
+    #[cfg(feature = "mod-hardware")]
+    _mem_tx: watch::Sender<MemoryState>,
+    #[cfg(feature = "mod-hardware")]
+    _sys_tx: watch::Sender<SysState>,
+    #[cfg(feature = "mod-hardware")]
+    _gpu_tx: watch::Sender<GpuState>,
+    #[cfg(feature = "mod-hardware")]
+    _disks_tx: watch::Sender<Vec<DiskInfo>>,
+    #[cfg(feature = "mod-bt")]
+    _bt_tx: watch::Sender<BtState>,
+    #[cfg(feature = "mod-audio")]
+    _audio_tx: watch::Sender<AudioState>,
+    #[cfg(feature = "mod-dbus")]
+    _mpris_tx: watch::Sender<MprisState>,
+    #[cfg(feature = "mod-dbus")]
+    _backlight_tx: watch::Sender<BacklightState>,
+    #[cfg(feature = "mod-dbus")]
+    _keyboard_tx: watch::Sender<KeyboardState>,
+    #[cfg(feature = "mod-dbus")]
+    _dnd_tx: watch::Sender<DndState>,
+}
+
+/// Plain-data counterpart of [`AppReceivers`] used to seed a [`MockState`].
+#[cfg(test)]
+#[derive(Default, Clone)]
+pub struct AppState {
+    #[cfg(feature = "mod-network")]
+    pub network: NetworkState,
+    #[cfg(feature = "mod-hardware")]
+    pub cpu: CpuState,
+    #[cfg(feature = "mod-hardware")]
+    pub memory: MemoryState,
+    #[cfg(feature = "mod-hardware")]
+    pub sys: SysState,
+    #[cfg(feature = "mod-hardware")]
+    pub gpu: GpuState,
+    #[cfg(feature = "mod-hardware")]
+    pub disks: Vec<DiskInfo>,
+    #[cfg(feature = "mod-bt")]
+    pub bluetooth: BtState,
+    #[cfg(feature = "mod-audio")]
+    pub audio: AudioState,
+    #[cfg(feature = "mod-dbus")]
+    pub mpris: MprisState,
+    #[cfg(feature = "mod-dbus")]
+    pub backlight: BacklightState,
+    #[cfg(feature = "mod-dbus")]
+    pub keyboard: KeyboardState,
+    #[cfg(feature = "mod-dbus")]
+    pub dnd: DndState,
+    pub health: HashMap<String, ModuleHealth>,
+}
+
+/// Build a [`MockState`] from a plain [`AppState`] snapshot for unit tests.
+#[cfg(test)]
+pub fn mock_state(state: AppState) -> MockState {
+    #[cfg(feature = "mod-network")]
+    let (net_tx, net_rx) = watch::channel(state.network);
+    #[cfg(feature = "mod-hardware")]
+    let (cpu_tx, cpu_rx) = watch::channel(state.cpu);
+    #[cfg(feature = "mod-hardware")]
+    let (mem_tx, mem_rx) = watch::channel(state.memory);
+    #[cfg(feature = "mod-hardware")]
+    let (sys_tx, sys_rx) = watch::channel(state.sys);
+    #[cfg(feature = "mod-hardware")]
+    let (gpu_tx, gpu_rx) = watch::channel(state.gpu);
+    #[cfg(feature = "mod-hardware")]
+    let (disks_tx, disks_rx) = watch::channel(state.disks);
+    #[cfg(feature = "mod-bt")]
+    let (bt_tx, bt_rx) = watch::channel(state.bluetooth);
+    #[cfg(feature = "mod-audio")]
+    let (audio_tx, audio_rx) = watch::channel(state.audio);
+    #[cfg(feature = "mod-dbus")]
+    let (mpris_tx, mpris_rx) = watch::channel(state.mpris);
+    #[cfg(feature = "mod-dbus")]
+    let (backlight_tx, backlight_rx) = watch::channel(state.backlight);
+    #[cfg(feature = "mod-dbus")]
+    let (keyboard_tx, keyboard_rx) = watch::channel(state.keyboard);
+    #[cfg(feature = "mod-dbus")]
+    let (dnd_tx, dnd_rx) = watch::channel(state.dnd);
+    #[cfg(feature = "mod-bt")]
+    let (bt_force_tx, _) = mpsc::channel(1);
+    #[cfg(feature = "mod-audio")]
+    let (audio_cmd_tx, _) = mpsc::channel(1);
+
+    MockState {
+        receivers: AppReceivers {
+            #[cfg(feature = "mod-network")]
+            network: net_rx,
+            #[cfg(feature = "mod-hardware")]
+            cpu: cpu_rx,
+            #[cfg(feature = "mod-hardware")]
+            memory: mem_rx,
+            #[cfg(feature = "mod-hardware")]
+            sys: sys_rx,
+            #[cfg(feature = "mod-hardware")]
+            gpu: gpu_rx,
+            #[cfg(feature = "mod-hardware")]
+            disks: disks_rx,
+            #[cfg(feature = "mod-bt")]
+            bluetooth: bt_rx,
+            #[cfg(feature = "mod-bt")]
+            bt_cycle: Arc::new(RwLock::new(0usize)),
+            #[cfg(feature = "mod-audio")]
+            audio: audio_rx,
+            #[cfg(feature = "mod-dbus")]
+            mpris: mpris_rx,
+            #[cfg(feature = "mod-dbus")]
+            backlight: backlight_rx,
+            #[cfg(feature = "mod-dbus")]
+            keyboard: keyboard_rx,
+            #[cfg(feature = "mod-dbus")]
+            dnd: dnd_rx,
+            #[cfg(feature = "mod-dbus")]
+            mpris_scroll: Arc::new(RwLock::new(MprisScrollState::default())),
+            #[cfg(feature = "mod-dbus")]
+            mpris_scroll_tick: {
+                let (_, rx) = watch::channel(0u64);
+                rx
+            },
+            health: Arc::new(RwLock::new(state.health)),
+            #[cfg(feature = "mod-bt")]
+            bt_force_poll: bt_force_tx,
+            #[cfg(feature = "mod-audio")]
+            audio_cmd_tx,
+        },
+        #[cfg(feature = "mod-network")]
+        _net_tx: net_tx,
+        #[cfg(feature = "mod-hardware")]
+        _cpu_tx: cpu_tx,
+        #[cfg(feature = "mod-hardware")]
+        _mem_tx: mem_tx,
+        #[cfg(feature = "mod-hardware")]
+        _sys_tx: sys_tx,
+        #[cfg(feature = "mod-hardware")]
+        _gpu_tx: gpu_tx,
+        #[cfg(feature = "mod-hardware")]
+        _disks_tx: disks_tx,
+        #[cfg(feature = "mod-bt")]
+        _bt_tx: bt_tx,
+        #[cfg(feature = "mod-audio")]
+        _audio_tx: audio_tx,
+        #[cfg(feature = "mod-dbus")]
+        _mpris_tx: mpris_tx,
+        #[cfg(feature = "mod-dbus")]
+        _backlight_tx: backlight_tx,
+        #[cfg(feature = "mod-dbus")]
+        _keyboard_tx: keyboard_tx,
+        #[cfg(feature = "mod-dbus")]
+        _dnd_tx: dnd_tx,
+    }
+}

src/utils.rs

@@ -1,33 +1,31 @@
+//! Shared helpers: menu spawning, Hyprland socket lookup, and template formatting.
+
 use anyhow::{Context, Result};
 use std::io::Write;
 use std::process::{Command, Stdio};
 
-/// Run an external command and return its stdout as a trimmed String.
+/// Pipe `items` into an external menu program (rofi/dmenu/wofi) and return
-/// Provides clear error messages when the command is not found or fails.
+/// the user's selection.
-pub fn run_command(cmd: &str, args: &[&str]) -> Result<String> {
+///
-    let output = Command::new(cmd)
+/// The prompt is exposed to the command as `$FLUXO_PROMPT` (preferred) and
-        .args(args)
+/// as a legacy `{prompt}` placeholder that is substituted in the shell string.
-        .output()
-        .with_context(|| format!("'{}' not found or failed to execute. Is it installed?", cmd))?;
-    if !output.status.success() {
-        let stderr = String::from_utf8_lossy(&output.stderr);
-        anyhow::bail!("'{}' exited with {}: {}", cmd, output.status, stderr.trim());
-    }
-    Ok(String::from_utf8_lossy(&output.stdout).trim().to_string())
-}
-
 pub fn show_menu(prompt: &str, items: &[String], menu_cmd: &str) -> Result<String> {
     let cmd_str = menu_cmd.replace("{prompt}", prompt);
     let mut child = Command::new("sh")
         .arg("-c")
         .arg(&cmd_str)
+        .env("FLUXO_PROMPT", prompt)
         .stdin(Stdio::piped())
         .stdout(Stdio::piped())
+        // Suppress GTK/Wayland noise from tools like wofi.
+        .stderr(Stdio::null())
         .spawn()
         .context("Failed to spawn menu command")?;
 
     if let Some(mut stdin) = child.stdin.take() {
-        let input = items.join("\n");
+        let mut input = items.join("\n");
+        // Trailing newline is required by wofi/rofi.
+        input.push('\n');
         stdin
             .write_all(input.as_bytes())
             .context("Failed to write to menu stdin")?;
@@ -47,23 +45,76 @@ pub fn show_menu(prompt: &str, items: &[String], menu_cmd: &str) -> Result<Strin
     Ok(selected)
 }
 
+/// Resolve the path to a Hyprland IPC socket for the current session.
+///
+/// Looks under `$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/` first,
+/// then falls back to `/tmp/hypr/...` for older Hyprland builds.
+pub fn get_hyprland_socket(socket_name: &str) -> Result<std::path::PathBuf> {
+    let signature = std::env::var("HYPRLAND_INSTANCE_SIGNATURE")
+        .context("HYPRLAND_INSTANCE_SIGNATURE not set")?;
+
+    if let Ok(runtime_dir) = std::env::var("XDG_RUNTIME_DIR") {
+        let path = std::path::PathBuf::from(runtime_dir)
+            .join("hypr")
+            .join(&signature)
+            .join(socket_name);
+        if path.exists() {
+            return Ok(path);
+        }
+    }
+
+    let path = std::path::PathBuf::from("/tmp/hypr")
+        .join(&signature)
+        .join(socket_name);
+
+    if path.exists() {
+        Ok(path)
+    } else {
+        Err(anyhow::anyhow!(
+            "Hyprland socket {} not found in runtime dir or /tmp",
+            socket_name
+        ))
+    }
+}
+
 use regex::Regex;
 use std::sync::LazyLock;
 
-pub enum TokenValue<'a> {
+/// Bucket `value` into `"normal"`, `"high"`, or `"max"` for CSS class output.
-    Float(f64),
+pub fn classify_usage(value: f64, high: f64, max: f64) -> &'static str {
-    Int(i64),
+    if value > max {
-    String(&'a str),
+        "max"
+    } else if value > high {
+        "high"
+    } else {
+        "normal"
+    }
 }
 
-pub fn format_template(template: &str, values: &[(&str, TokenValue)]) -> String {
+/// A typed value supplied to [`format_template`] — chosen at call site so
-    static RE: LazyLock<Regex> = LazyLock::new(|| {
+/// formatting handles precision and alignment correctly per type.
-        Regex::new(r"\{([a-zA-Z0-9_]+)(?::([<>\^])?(\d+)?(?:\.(\d+))?)?\}").unwrap()
+pub enum TokenValue {
-    });
+    Float(f64),
+    Int(i64),
+    String(String),
+}
 
-    RE.replace_all(template, |caps: &regex::Captures| {
+/// Token grammar: `{name}`, `{name:>5}`, `{name:<8.2}`, `{name:^6}`, etc.
+pub static TOKEN_RE: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"\{([a-zA-Z0-9_]+)(?::([<>\^])?(\d+)?(?:\.(\d+))?)?\}").unwrap());
+
+/// Substitute `{name[:align[width[.precision]]]}` tokens in a template string.
+///
+/// Unknown tokens are left verbatim. Width/alignment/precision follow Rust's
+/// `std::fmt` semantics (`<` left, `^` center, `>` right).
+pub fn format_template<K>(template: &str, values: &[(K, TokenValue)]) -> String
+where
+    K: AsRef<str>,
+{
+    TOKEN_RE
+        .replace_all(template, |caps: &regex::Captures| {
             let name = &caps[1];
-        if let Some((_, val)) = values.iter().find(|(k, _)| *k == name) {
+            if let Some((_, val)) = values.iter().find(|(k, _)| k.as_ref() == name) {
                 let align = caps.get(2).map(|m| m.as_str()).unwrap_or(">");
                 let width = caps
                     .get(3)
@@ -114,3 +165,118 @@ fn format_str(s: &str, align: &str, width: usize) -> String {
         _ => s.to_string(),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple_string_token() {
+        let result = format_template(
+            "{name}",
+            &[("name", TokenValue::String("hello".to_string()))],
+        );
+        assert_eq!(result, "hello");
+    }
+
+    #[test]
+    fn test_simple_float_token() {
+        let result = format_template("{val}", &[("val", TokenValue::Float(3.15))]);
+        assert_eq!(result, "3.15");
+    }
+
+    #[test]
+    fn test_simple_int_token() {
+        let result = format_template("{count}", &[("count", TokenValue::Int(42))]);
+        assert_eq!(result, "42");
+    }
+
+    #[test]
+    fn test_float_right_align_with_precision() {
+        let result = format_template("{val:>8.2}", &[("val", TokenValue::Float(3.15))]);
+        assert_eq!(result, "    3.15");
+        assert_eq!(result.len(), 8);
+    }
+
+    #[test]
+    fn test_float_left_align_with_precision() {
+        let result = format_template("{val:<8.2}", &[("val", TokenValue::Float(3.15))]);
+        assert_eq!(result, "3.15    ");
+        assert_eq!(result.len(), 8);
+    }
+
+    #[test]
+    fn test_float_center_align_with_precision() {
+        let result = format_template("{val:^8.2}", &[("val", TokenValue::Float(3.15))]);
+        assert_eq!(result, "  3.15  ");
+        assert_eq!(result.len(), 8);
+    }
+
+    #[test]
+    fn test_int_right_align() {
+        let result = format_template("{val:>5}", &[("val", TokenValue::Int(42))]);
+        assert_eq!(result, "   42");
+    }
+
+    #[test]
+    fn test_string_left_align() {
+        let result = format_template(
+            "{val:<10}",
+            &[("val", TokenValue::String("hi".to_string()))],
+        );
+        assert_eq!(result, "hi        ");
+        assert_eq!(result.len(), 10);
+    }
+
+    #[test]
+    fn test_unknown_token_preserved() {
+        let result = format_template(
+            "{unknown}",
+            &[("name", TokenValue::String("test".to_string()))],
+        );
+        assert_eq!(result, "{unknown}");
+    }
+
+    #[test]
+    fn test_multiple_tokens() {
+        let result = format_template(
+            "CPU: {usage:>4.1}% {temp:>4.1}C",
+            &[
+                ("usage", TokenValue::Float(55.3)),
+                ("temp", TokenValue::Float(65.0)),
+            ],
+        );
+        assert_eq!(result, "CPU: 55.3% 65.0C");
+    }
+
+    #[test]
+    fn test_no_tokens() {
+        let result = format_template::<&'static str>("plain text", &[]);
+        assert_eq!(result, "plain text");
+    }
+
+    #[test]
+    fn test_empty_template() {
+        let result = format_template("", &[("x", TokenValue::Int(1))]);
+        assert_eq!(result, "");
+    }
+
+    #[test]
+    fn test_mixed_token_types() {
+        let result = format_template(
+            "{name} ({ip}): {rx:>5.2} MB/s",
+            &[
+                ("name", TokenValue::String("eth0".to_string())),
+                ("ip", TokenValue::String("10.0.0.1".to_string())),
+                ("rx", TokenValue::Float(1.5)),
+            ],
+        );
+        assert_eq!(result, "eth0 (10.0.0.1):  1.50 MB/s");
+    }
+
+    #[test]
+    fn test_float_precision_zero() {
+        let result = format_template("{val:>3.0}", &[("val", TokenValue::Float(99.7))]);
+        assert_eq!(result, "100");
+    }
+}