feat: Add Gemini CLI Integration (#271)

Author: hieusats

tools/installer/bin/bmad.js

@@ -50,7 +50,7 @@ program
   .option('-t, --team <team>', 'Install specific team with required agents and dependencies')
   .option('-x, --expansion-only', 'Install only expansion packs (no bmad-core)')
   .option('-d, --directory <path>', 'Installation directory (default: .bmad-core)')
-  .option('-i, --ide <ide...>', 'Configure for specific IDE(s) - can specify multiple (cursor, claude-code, windsurf, roo, cline, other)')
+  .option('-i, --ide <ide...>', 'Configure for specific IDE(s) - can specify multiple (cursor, claude-code, windsurf, roo, cline, gemini, other)')
   .option('-e, --expansion-packs <packs...>', 'Install specific expansion packs (can specify multiple)')
   .action(async (options) => {
     try {
@@ -314,7 +314,8 @@ async function promptInstallation() {
         { name: 'Claude Code', value: 'claude-code' },
         { name: 'Windsurf', value: 'windsurf' },
         { name: 'Roo Code', value: 'roo' },
-        { name: 'Cline', value: 'cline' }
+        { name: 'Cline', value: 'cline' },
+        { name: 'Gemini CLI', value: 'gemini' }
       ]
     }
   ]);

tools/installer/config/install.config.yml

@@ -101,6 +101,16 @@ ide-configurations:
       # 2. Type @agent-name (e.g., "@dev", "@pm", "@architect")
       # 3. The agent will adopt that persona for the conversation
       # 4. Rules are stored in .clinerules/ directory in your project
+  gemini:
+    name: Gemini CLI
+    rule-dir: .gemini/agents/
+    format: context-files
+    instructions: |
+      # To use BMAD agents with the Gemini CLI:
+      # 1. The installer creates a .gemini/ directory in your project.
+      # 2. It also configures .gemini/settings.json to load all agent files.
+      # 3. Simply mention the agent in your prompt (e.g., "As @dev, ...").
+      # 4. The Gemini CLI will automatically have the context for that agent.
 available-agents:
   - id: analyst
     name: Business Analyst

tools/installer/lib/ide-setup.js

@@ -33,6 +33,8 @@ class IdeSetup {
         return this.setupRoo(installDir, selectedAgent);
       case "cline":
         return this.setupCline(installDir, selectedAgent);
+      case "gemini":
+        return this.setupGeminiCli(installDir, selectedAgent);
       default:
         console.log(chalk.yellow(`\nIDE ${ide} not yet supported`));
         return false;
@@ -411,6 +413,63 @@ class IdeSetup {
 
     return true;
   }
+
+  async setupGeminiCli(installDir, selectedAgent) {
+    await initializeModules();
+    const geminiDir = path.join(installDir, ".gemini");
+    const agentsContextDir = path.join(geminiDir, "agents");
+    await fileManager.ensureDirectory(agentsContextDir);
+
+    // Get all available agents
+    const agents = await this.getAllAgentIds(installDir);
+    const agentContextFiles = [];
+
+    for (const agentId of agents) {
+      // Find the source agent file
+      let agentPath = path.join(installDir, ".bmad-core", "agents", `${agentId}.md`);
+      if (!(await fileManager.pathExists(agentPath))) {
+        agentPath = path.join(installDir, "agents", `${agentId}.md`);
+      }
+
+      if (await fileManager.pathExists(agentPath)) {
+        const agentContent = await fileManager.readFile(agentPath);
+        const contextFilePath = path.join(agentsContextDir, `${agentId}.md`);
+
+        // Copy the agent content directly into its own context file
+        await fileManager.writeFile(contextFilePath, agentContent);
+
+        // Store the relative path for settings.json
+        const relativePath = path.relative(geminiDir, contextFilePath);
+        agentContextFiles.push(relativePath.replace(/\\/g, '/')); // Ensure forward slashes for consistency
+        console.log(chalk.green(`✓ Created context file for @${agentId}`));
+      }
+    }
+
+    console.log(chalk.green(`\n✓ Created individual agent context files in ${agentsContextDir}`));
+
+    // Create or update settings.json
+    const settingsPath = path.join(geminiDir, "settings.json");
+    let settings = {};
+
+    if (await fileManager.pathExists(settingsPath)) {
+      try {
+        const existingSettings = await fileManager.readFile(settingsPath);
+        settings = JSON.parse(existingSettings);
+        console.log(chalk.yellow("Found existing .gemini/settings.json. Merging settings..."));
+      } catch (e) {
+        console.error(chalk.red("Error parsing existing settings.json. It will be overwritten."), e);
+        settings = {};
+      }
+    }
+
+    // Set contextFileName to our new array of files
+    settings.contextFileName = agentContextFiles;
+
+    await fileManager.writeFile(settingsPath, JSON.stringify(settings, null, 2));
+    console.log(chalk.green(`✓ Configured .gemini/settings.json to load all agent context files.`));
+
+    return true;
+  }
 }
 
 module.exports = new IdeSetup();