updated rule based logic for finding and outputting files

Cargo.lock

@@ -853,7 +853,7 @@ dependencies = [
 
 [[package]]
 name = "mould"
-version = "0.4.2"
+version = "0.4.3"
 dependencies = [
  "anyhow",
  "clap",

Cargo.toml

@@ -30,4 +30,4 @@ tempfile = "3.27.0"
 authors = ["Nils Pukropp <nils@narl.io>"]
 edition = "2024"
 name = "mould"
-version = "0.4.2"
+version = "0.4.3"

src/main.rs

@@ -5,6 +5,7 @@ mod error;
 mod format;
 mod runner;
 mod ui;
+mod resolver;
 
 use app::App;
 use config::load_config;
@@ -13,7 +14,6 @@ use format::{detect_format, get_handler};
 use log::{error, info, warn};
 use runner::AppRunner;
 use std::io;
-use std::path::{Path, PathBuf};
 
 use crossterm::{
     event::{DisableMouseCapture, EnableMouseCapture},
@@ -22,114 +22,6 @@ use crossterm::{
 };
 use ratatui::{Terminal, backend::CrosstermBackend};
 
-/// Helper to automatically determine the output file path based on common naming conventions.
-fn determine_output_path(input: &Path) -> PathBuf {
-    let file_name = input.file_name().unwrap_or_default().to_string_lossy();
-
-    // Standard mappings
-    if file_name == ".env.example" || file_name == ".env.template" {
-        return input.with_file_name(".env");
-    }
-
-    if file_name == "docker-compose.yml" || file_name == "compose.yml" {
-        return input.with_file_name("compose.override.yml");
-    }
-    if file_name == "docker-compose.yaml" || file_name == "compose.yaml" {
-        return input.with_file_name("compose.override.yaml");
-    }
-
-    // Pattern-based mappings
-    if let Some(base) = file_name.strip_suffix(".env.example") {
-        return input.with_file_name(format!("{}.env", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".env.template") {
-        return input.with_file_name(format!("{}.env", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".example.json") {
-        return input.with_file_name(format!("{}.json", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".template.json") {
-        return input.with_file_name(format!("{}.json", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".example.yml") {
-        return input.with_file_name(format!("{}.yml", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".template.yml") {
-        return input.with_file_name(format!("{}.yml", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".example.yaml") {
-        return input.with_file_name(format!("{}.yaml", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".template.yaml") {
-        return input.with_file_name(format!("{}.yaml", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".example.toml") {
-        return input.with_file_name(format!("{}.toml", base));
-    }
-    if let Some(base) = file_name.strip_suffix(".template.toml") {
-        return input.with_file_name(format!("{}.toml", base));
-    }
-
-    input.with_extension(format!(
-        "{}.out",
-        input.extension().unwrap_or_default().to_string_lossy()
-    ))
-}
-
-/// Discovers common configuration template files in the current directory.
-fn find_input_file() -> Option<PathBuf> {
-    let candidates = [
-        ".env.example",
-        "compose.yml",
-        "docker-compose.yml",
-        ".env.template",
-        "compose.yaml",
-        "docker-compose.yaml",
-    ];
-
-    // Priority 1: Exact matches for well-known defaults
-    for name in &candidates {
-        let path = PathBuf::from(name);
-        if path.exists() {
-            return Some(path);
-        }
-    }
-
-    // Priority 2: Pattern matches
-    if let Ok(entries) = std::fs::read_dir(".") {
-        let mut fallback = None;
-        for entry in entries.flatten() {
-            let name = entry.file_name();
-            let name_str = name.to_string_lossy();
-
-            if name_str.ends_with(".env.example")
-                || name_str.ends_with(".env.template")
-                || name_str.ends_with(".example.json")
-                || name_str.ends_with(".template.json")
-                || name_str.ends_with(".example.yml")
-                || name_str.ends_with(".template.yml")
-                || name_str.ends_with(".example.yaml")
-                || name_str.ends_with(".template.yaml")
-                || name_str.ends_with(".example.toml")
-                || name_str.ends_with(".template.toml")
-            {
-                // Prefer .env.* or compose.* if multiple matches
-                if name_str.contains(".env") || name_str.contains("compose") {
-                    return Some(entry.path());
-                }
-                if fallback.is_none() {
-                    fallback = Some(entry.path());
-                }
-            }
-        }
-        if let Some(path) = fallback {
-            return Some(path);
-        }
-    }
-
-    None
-}
-
 fn main() -> anyhow::Result<()> {
     let args = cli::parse();
 
@@ -152,7 +44,7 @@ fn main() -> anyhow::Result<()> {
             }
             path
         }
-        None => match find_input_file() {
+        None => match resolver::find_input_file() {
             Some(path) => {
                 info!("Discovered template: {}", path.display());
                 path
@@ -172,38 +64,11 @@ fn main() -> anyhow::Result<()> {
     let handler = get_handler(format_type);
 
     // Smart Comparison Logic
-    let input_name = input_path.file_name().unwrap_or_default().to_string_lossy();
-    let is_template_input = input_name.contains(".example") || input_name.contains(".template") || input_name == "compose.yml" || input_name == "docker-compose.yml";
-    
-    let mut template_path = None;
-    let mut active_path = None;
-
-    if is_template_input {
-        template_path = Some(input_path.clone());
-        let expected_active = determine_output_path(&input_path);
-        if expected_active.exists() {
-            active_path = Some(expected_active);
-        }
-    } else {
-        // Input is likely an active config (e.g., .env)
-        active_path = Some(input_path.clone());
-        // Try to find a template
-        let possible_templates = [
-            format!("{}.example", input_name),
-            format!("{}.template", input_name),
-        ];
-        for t in possible_templates {
-            let p = input_path.with_file_name(t);
-            if p.exists() {
-                template_path = Some(p);
-                break;
-            }
-        }
-    }
+    let (active_path, template_path) = resolver::resolve_paths(&input_path);
 
     let output_path = args
         .output
-        .unwrap_or_else(|| active_path.clone().unwrap_or_else(|| determine_output_path(&input_path)));
+        .unwrap_or_else(|| active_path.clone().unwrap_or_else(|| resolver::determine_output_path(&input_path)));
 
     info!("Output: {}", output_path.display());
 

src/resolver.rs

@@ -0,0 +1,193 @@
+use std::path::{Path, PathBuf};
+
+pub struct Rule {
+    pub template_suffix: &'static str,
+    pub active_suffix: &'static str,
+    pub is_exact_match: bool,
+}
+
+pub const RULES: &[Rule] = &[
+    // Exact matches
+    Rule { template_suffix: "compose.yml", active_suffix: "compose.override.yml", is_exact_match: true },
+    Rule { template_suffix: "compose.yaml", active_suffix: "compose.override.yaml", is_exact_match: true },
+    Rule { template_suffix: "docker-compose.yml", active_suffix: "docker-compose.override.yml", is_exact_match: true },
+    Rule { template_suffix: "docker-compose.yaml", active_suffix: "docker-compose.override.yaml", is_exact_match: true },
+    
+    // Pattern matches
+    Rule { template_suffix: ".env.example", active_suffix: ".env", is_exact_match: false },
+    Rule { template_suffix: ".env.template", active_suffix: ".env", is_exact_match: false },
+    Rule { template_suffix: ".example.json", active_suffix: ".json", is_exact_match: false },
+    Rule { template_suffix: ".template.json", active_suffix: ".json", is_exact_match: false },
+    Rule { template_suffix: ".example.yml", active_suffix: ".yml", is_exact_match: false },
+    Rule { template_suffix: ".template.yml", active_suffix: ".yml", is_exact_match: false },
+    Rule { template_suffix: ".example.yaml", active_suffix: ".yaml", is_exact_match: false },
+    Rule { template_suffix: ".template.yaml", active_suffix: ".yaml", is_exact_match: false },
+    Rule { template_suffix: ".example.toml", active_suffix: ".toml", is_exact_match: false },
+    Rule { template_suffix: ".template.toml", active_suffix: ".toml", is_exact_match: false },
+];
+
+pub const DEFAULT_CANDIDATES: &[&str] = &[
+    ".env.example",
+    "compose.yml",
+    "docker-compose.yml",
+    ".env.template",
+    "compose.yaml",
+    "docker-compose.yaml",
+];
+
+/// Helper to automatically determine the output file path based on common naming conventions.
+pub fn determine_output_path(input: &Path) -> PathBuf {
+    let file_name = input.file_name().unwrap_or_default().to_string_lossy();
+
+    for rule in RULES {
+        if rule.is_exact_match {
+            if file_name == rule.template_suffix {
+                return input.with_file_name(rule.active_suffix);
+            }
+        } else {
+            if file_name == rule.template_suffix {
+                return input.with_file_name(rule.active_suffix);
+            } else if let Some(base) = file_name.strip_suffix(rule.template_suffix) {
+                return input.with_file_name(format!("{}{}", base, rule.active_suffix));
+            }
+        }
+    }
+
+    input.with_extension(format!(
+        "{}.out",
+        input.extension().unwrap_or_default().to_string_lossy()
+    ))
+}
+
+/// Discovers common configuration template files in the current directory.
+pub fn find_input_file() -> Option<PathBuf> {
+    // Priority 1: Exact matches for well-known defaults
+    for &name in DEFAULT_CANDIDATES {
+        let path = PathBuf::from(name);
+        if path.exists() {
+            return Some(path);
+        }
+    }
+
+    // Priority 2: Pattern matches
+    if let Ok(entries) = std::fs::read_dir(".") {
+        let mut fallback = None;
+        for entry in entries.flatten() {
+            let name = entry.file_name();
+            let name_str = name.to_string_lossy();
+
+            for rule in RULES {
+                if !rule.is_exact_match && name_str.ends_with(rule.template_suffix) {
+                    if name_str.contains(".env") || name_str.contains("compose") {
+                        return Some(entry.path());
+                    }
+                    if fallback.is_none() {
+                        fallback = Some(entry.path());
+                    }
+                    break;
+                }
+            }
+        }
+        if let Some(path) = fallback {
+            return Some(path);
+        }
+    }
+
+    None
+}
+
+/// Resolves the active and template paths given an input path.
+/// Returns `(active_path, template_path)`.
+pub fn resolve_paths(input: &Path) -> (Option<PathBuf>, Option<PathBuf>) {
+    let file_name = input.file_name().unwrap_or_default().to_string_lossy();
+    
+    // Check if the input matches any known template pattern
+    let mut is_template = false;
+    for rule in RULES {
+        if rule.is_exact_match {
+            if file_name == rule.template_suffix {
+                is_template = true;
+                break;
+            }
+        } else if file_name.ends_with(rule.template_suffix) {
+            is_template = true;
+            break;
+        }
+    }
+
+    // Fallback template detection
+    if !is_template && (file_name.contains(".example") || file_name.contains(".template")) {
+        is_template = true;
+    }
+
+    if is_template {
+        let expected_active = determine_output_path(input);
+        let active = if expected_active.exists() {
+            Some(expected_active)
+        } else {
+            None
+        };
+        (active, Some(input.to_path_buf()))
+    } else {
+        // Input is treated as the active config
+        let active = Some(input.to_path_buf());
+        let mut template = None;
+        
+        // Try to reverse match rules to find a template
+        for rule in RULES {
+            if rule.is_exact_match {
+                if file_name == rule.active_suffix {
+                    let t = input.with_file_name(rule.template_suffix);
+                    if t.exists() {
+                        template = Some(t);
+                        break;
+                    }
+                }
+            } else if file_name.ends_with(rule.active_suffix) {
+                if file_name == rule.active_suffix {
+                    let t = input.with_file_name(rule.template_suffix);
+                    if t.exists() {
+                        template = Some(t);
+                        break;
+                    }
+                } else if let Some(base) = file_name.strip_suffix(rule.active_suffix) {
+                    let t = input.with_file_name(format!("{}{}", base, rule.template_suffix));
+                    if t.exists() {
+                        template = Some(t);
+                        break;
+                    }
+                }
+            }
+        }
+        
+        // Fallback reverse detection
+        if template.is_none() {
+            let possible_templates = [
+                format!("{}.example", file_name),
+                format!("{}.template", file_name),
+            ];
+            for t in possible_templates {
+                let p = input.with_file_name(t);
+                if p.exists() {
+                    template = Some(p);
+                    break;
+                }
+            }
+        }
+
+        (active, template)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_determine_output_path() {
+        assert_eq!(determine_output_path(Path::new(".env.example")), PathBuf::from(".env"));
+        assert_eq!(determine_output_path(Path::new("compose.yml")), PathBuf::from("compose.override.yml"));
+        assert_eq!(determine_output_path(Path::new("config.template.json")), PathBuf::from("config.json"));
+        assert_eq!(determine_output_path(Path::new("config.example")), PathBuf::from("config.example.out"));
+    }
+}