feat: plugin system with manifest-based discovery

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src-tauri/plugins/writing-studio/manifest.json

@@ -0,0 +1,7 @@
+{
+  "name": "writing-studio",
+  "version": "1.0.0",
+  "description": "Goal tracking, manuscript panels, snapshots, and sprint engine for writers",
+  "author": "ConcreteInfo",
+  "builtin": true
+}

src-tauri/src/commands/mod.rs

@@ -4,3 +4,4 @@ pub mod git;
 pub mod app;
 pub mod pdf;
 pub mod dialog;
+pub mod plugins;

src-tauri/src/commands/plugins.rs

@@ -0,0 +1,31 @@
+use crate::error::AppError;
+use crate::plugin_manager::PluginMetadata;
+
+#[tauri::command]
+pub fn list_plugins() -> Vec<PluginMetadata> {
+    // This would be connected to the app state in a full implementation
+    // For now, return the built-in plugins
+    vec![
+        PluginMetadata {
+            name: "writing-studio".to_string(),
+            version: "1.0.0".to_string(),
+            description: "Goal tracking, manuscript panels, snapshots, and sprint engine for writers".to_string(),
+            author: "ConcreteInfo".to_string(),
+            builtin: true,
+        }
+    ]
+}
+
+#[tauri::command]
+pub fn get_plugin(name: String) -> Option<PluginMetadata> {
+    match name.as_str() {
+        "writing-studio" => Some(PluginMetadata {
+            name: "writing-studio".to_string(),
+            version: "1.0.0".to_string(),
+            description: "Goal tracking, manuscript panels, snapshots, and sprint engine for writers".to_string(),
+            author: "ConcreteInfo".to_string(),
+            builtin: true,
+        }),
+        _ => None,
+    }
+}

src-tauri/src/lib.rs

@@ -1,6 +1,7 @@
 pub mod menu;
 pub mod tray;
 pub mod pdf_ops;
+pub mod plugin_manager;
 
 pub fn run() {
     tauri::Builder::default()
@@ -42,6 +43,8 @@ pub fn run() {
             crate::commands::dialog::open_file_dialog,
             crate::commands::dialog::save_file_dialog,
             crate::commands::dialog::select_folder_dialog,
+            crate::commands::plugins::list_plugins,
+            crate::commands::plugins::get_plugin,
         ])
         .setup(|app| {
             log::info!("MarkdownConverter starting up");

src-tauri/src/plugin_manager.rs

@@ -0,0 +1,101 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use crate::error::AppError;
+
+#[derive(Debug, Clone)]
+pub struct PluginMetadata {
+    pub name: String,
+    pub version: String,
+    pub description: String,
+    pub author: String,
+    pub builtin: bool,
+}
+
+pub struct PluginManager {
+    plugins: HashMap<String, PluginMetadata>,
+    enabled: Vec<String>,
+}
+
+impl PluginManager {
+    pub fn new() -> Self {
+        PluginManager {
+            plugins: HashMap::new(),
+            enabled: Vec::new(),
+        }
+    }
+
+    pub fn load_plugins(&mut self, plugin_dir: PathBuf) -> Result<(), AppError> {
+        if !plugin_dir.exists() {
+            return Ok(());
+        }
+
+        for entry in walkdir::WalkDir::new(&plugin_dir)
+            .max_depth(1)
+            .into_iter()
+            .filter_map(|e| e.ok())
+        {
+            let path = entry.path();
+            if !path.is_dir() {
+                continue;
+            }
+
+            let manifest_path = path.join("manifest.json");
+            if manifest_path.exists() {
+                let content = std::fs::read_to_string(&manifest_path)
+                    .map_err(|e| AppError::Config(format!("Failed to read manifest: {}", e)))?;
+
+                #[derive(serde::Deserialize)]
+                struct RawPluginMetadata {
+                    name: String,
+                    version: String,
+                    description: String,
+                    author: String,
+                    builtin: Option<bool>,
+                }
+
+                let raw: RawPluginMetadata = serde_json::from_str(&content)
+                    .map_err(|e| AppError::Config(format!("Failed to parse manifest: {}", e)))?;
+
+                let metadata = PluginMetadata {
+                    name: raw.name,
+                    version: raw.version,
+                    description: raw.description,
+                    author: raw.author,
+                    builtin: raw.builtin.unwrap_or(false),
+                };
+
+                self.plugins.insert(metadata.name.clone(), metadata);
+            }
+        }
+
+        Ok(())
+    }
+
+    pub fn enable_plugin(&mut self, name: &str) {
+        if !self.enabled.contains(&name.to_string()) {
+            self.enabled.push(name.to_string());
+        }
+    }
+
+    pub fn disable_plugin(&mut self, name: &str) {
+        self.enabled.retain(|n| n != name);
+    }
+
+    pub fn get_enabled(&self) -> Vec<String> {
+        self.enabled.clone()
+    }
+
+    pub fn list_plugins(&self) -> Vec<PluginMetadata> {
+        self.plugins.values().cloned().collect()
+    }
+
+    pub fn get_plugin(&self, name: &str) -> Option<PluginMetadata> {
+        self.plugins.get(name).cloned()
+    }
+}
+
+impl Default for PluginManager {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/tauri-commands.js

@@ -85,4 +85,12 @@ export const events = {
   onToggleBottomPanel: (callback) => listen('toggle-bottom-panel', callback),
   onConversionComplete: (callback) => listen('conversion-complete', callback),
   onConversionStatus: (callback) => listen('conversion-status', callback),
+};
+
+// ============================================
+// PLUGIN OPERATIONS
+// ============================================
+export const plugins = {
+  list: () => invoke('list_plugins', {}),
+  get: (name) => invoke('get_plugin', { name }),
 };