Add interactive plugin installation

src/PluginHost.js

@@ -4,6 +4,11 @@ import { join, resolve, dirname } from 'path';
 import { existsSync } from 'fs';
 import { fileURLToPath } from 'url';
 import fetch from 'node-fetch';
+import { exec } from 'child_process';
+import { promisify } from 'util';
+import readline from 'readline';
+
+const execAsync = promisify(exec);
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -291,6 +296,99 @@ export class PluginHost extends EventEmitter {
     return Array.from(this.pluginRegistry.values());
   }
 
+  /**
+   * Install a plugin from its repository
+   */
+  async installPlugin(pluginId) {
+    const pluginDef = this.pluginRegistry.get(pluginId);
+    if (!pluginDef) {
+      throw new Error(`Plugin ${pluginId} not found in registry`);
+    }
+
+    const pluginPath = join(this.pluginsDir, pluginId);
+    if (existsSync(pluginPath)) {
+      console.log(`⚠ Plugin ${pluginId} already installed`);
+      return false;
+    }
+
+    console.log(`📥 Installing ${pluginDef.name} v${pluginDef.version}...`);
+    
+    try {
+      await execAsync(`git clone ${pluginDef.repository} "${pluginPath}"`, {
+        cwd: this.pluginsDir
+      });
+      
+      console.log(`✅ Installed ${pluginDef.name}`);
+      this.emit('plugin-installed', pluginDef);
+      return true;
+    } catch (error) {
+      console.error(`❌ Failed to install ${pluginId}:`, error.message);
+      return false;
+    }
+  }
+
+  /**
+   * Interactive plugin installation
+   */
+  async interactiveInstall() {
+    const available = this.getRegistry();
+    const loadedIds = new Set(this.getLoadedPlugins().map(p => p.id));
+    const installedPluginDirs = existsSync(this.pluginsDir) 
+      ? await readdir(this.pluginsDir, { withFileTypes: true }).then(entries => 
+          entries.filter(e => e.isDirectory()).map(e => e.name)
+        )
+      : [];
+    const installedIds = new Set(installedPluginDirs);
+    
+    const installable = available.filter(p => !installedIds.has(p.id));
+
+    if (installable.length === 0) {
+      console.log('\n✨ All available plugins are already installed!');
+      return;
+    }
+
+    console.log('\n📦 Available Plugins to Install:');
+    console.log('================================');
+    installable.forEach((p, i) => {
+      console.log(`${i + 1}. ${p.name} v${p.version} by ${p.author}`);
+      console.log(`   ${p.description || 'No description'}`);
+    });
+
+    const rl = readline.createInterface({
+      input: process.stdin,
+      output: process.stdout
+    });
+
+    const question = (query) => new Promise(resolve => rl.question(query, resolve));
+
+    console.log('\nEnter plugin numbers to install (comma-separated), or "all" for all plugins:');
+    const answer = await question('> ');
+    
+    rl.close();
+
+    let toInstall = [];
+    
+    if (answer.toLowerCase().trim() === 'all') {
+      toInstall = installable;
+    } else {
+      const indices = answer.split(',').map(s => parseInt(s.trim()) - 1).filter(i => !isNaN(i));
+      toInstall = indices.map(i => installable[i]).filter(Boolean);
+    }
+
+    if (toInstall.length === 0) {
+      console.log('\n❌ No valid plugins selected');
+      return;
+    }
+
+    console.log(`\n📥 Installing ${toInstall.length} plugin(s)...`);
+    
+    for (const plugin of toInstall) {
+      await this.installPlugin(plugin.id);
+    }
+
+    console.log('\n✅ Installation complete!');
+  }
+
   /**
    * Shutdown the plugin host
    */