feat: update .gitignore in /setup-github

.gitignore

@@ -40,3 +40,6 @@ packages/cli/src/generated/
 packages/core/src/generated/
 .integration-tests/
 packages/vscode-ide-companion/*.vsix
+
+# GHA credentials
+gha-creds-*.json

packages/cli/src/ui/commands/setupGithubCommand.test.ts

@@ -10,7 +10,7 @@ import fs from 'node:fs/promises';
 
 import { vi, describe, expect, it, afterEach, beforeEach } from 'vitest';
 import * as gitUtils from '../../utils/gitUtils.js';
-import { setupGithubCommand } from './setupGithubCommand.js';
+import { setupGithubCommand, updateGitignore } from './setupGithubCommand.js';
 import { CommandContext, ToolActionReturn } from './types.js';
 import * as commandUtils from '../utils/commandUtils.js';
 
@@ -102,5 +102,138 @@ describe('setupGithubCommand', async () => {
       const contents = await fs.readFile(workflowFile, 'utf8');
       expect(contents).toContain(workflow);
     }
+
+    // Verify that .gitignore was created with the expected entries
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const gitignoreExists = await fs
+      .access(gitignorePath)
+      .then(() => true)
+      .catch(() => false);
+    expect(gitignoreExists).toBe(true);
+
+    if (gitignoreExists) {
+      const gitignoreContent = await fs.readFile(gitignorePath, 'utf8');
+      expect(gitignoreContent).toContain('.gemini/');
+      expect(gitignoreContent).toContain('gha-creds-*.json');
+    }
+  });
+});
+
+describe('updateGitignore', () => {
+  let scratchDir = '';
+
+  beforeEach(async () => {
+    scratchDir = await fs.mkdtemp(path.join(os.tmpdir(), 'update-gitignore-'));
+  });
+
+  afterEach(async () => {
+    if (scratchDir) await fs.rm(scratchDir, { recursive: true });
+  });
+
+  it('creates a new .gitignore file when none exists', async () => {
+    await updateGitignore(scratchDir);
+
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const content = await fs.readFile(gitignorePath, 'utf8');
+
+    expect(content).toBe('.gemini/\ngha-creds-*.json\n');
+  });
+
+  it('appends entries to existing .gitignore file', async () => {
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const existingContent = '# Existing content\nnode_modules/\n';
+    await fs.writeFile(gitignorePath, existingContent);
+
+    await updateGitignore(scratchDir);
+
+    const content = await fs.readFile(gitignorePath, 'utf8');
+
+    expect(content).toBe(
+      '# Existing content\nnode_modules/\n\n.gemini/\ngha-creds-*.json\n',
+    );
+  });
+
+  it('does not add duplicate entries', async () => {
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const existingContent = '.gemini/\nsome-other-file\ngha-creds-*.json\n';
+    await fs.writeFile(gitignorePath, existingContent);
+
+    await updateGitignore(scratchDir);
+
+    const content = await fs.readFile(gitignorePath, 'utf8');
+
+    expect(content).toBe(existingContent);
+  });
+
+  it('adds only missing entries when some already exist', async () => {
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const existingContent = '.gemini/\nsome-other-file\n';
+    await fs.writeFile(gitignorePath, existingContent);
+
+    await updateGitignore(scratchDir);
+
+    const content = await fs.readFile(gitignorePath, 'utf8');
+
+    // Should add only the missing gha-creds-*.json entry
+    expect(content).toBe('.gemini/\nsome-other-file\n\ngha-creds-*.json\n');
+    expect(content).toContain('gha-creds-*.json');
+    // Should not duplicate .gemini/ entry
+    expect((content.match(/\.gemini\//g) || []).length).toBe(1);
+  });
+
+  it('does not get confused by entries in comments or as substrings', async () => {
+    const gitignorePath = path.join(scratchDir, '.gitignore');
+    const existingContent = [
+      '# This is a comment mentioning .gemini/ folder',
+      'my-app.gemini/config',
+      '# Another comment with gha-creds-*.json pattern',
+      'some-other-gha-creds-file.json',
+      '',
+    ].join('\n');
+    await fs.writeFile(gitignorePath, existingContent);
+
+    await updateGitignore(scratchDir);
+
+    const content = await fs.readFile(gitignorePath, 'utf8');
+
+    // Should add both entries since they don't actually exist as gitignore rules
+    expect(content).toContain('.gemini/');
+    expect(content).toContain('gha-creds-*.json');
+
+    // Verify the entries were added (not just mentioned in comments)
+    const lines = content
+      .split('\n')
+      .map((line) => line.split('#')[0].trim())
+      .filter((line) => line);
+    expect(lines).toContain('.gemini/');
+    expect(lines).toContain('gha-creds-*.json');
+    expect(lines).toContain('my-app.gemini/config');
+    expect(lines).toContain('some-other-gha-creds-file.json');
+  });
+
+  it('handles file system errors gracefully', async () => {
+    // Try to update gitignore in a non-existent directory
+    const nonExistentDir = path.join(scratchDir, 'non-existent');
+
+    // This should not throw an error
+    await expect(updateGitignore(nonExistentDir)).resolves.toBeUndefined();
+  });
+
+  it('handles permission errors gracefully', async () => {
+    const consoleSpy = vi.spyOn(console, 'debug').mockImplementation(() => {});
+
+    const fsModule = await import('node:fs');
+    const writeFileSpy = vi
+      .spyOn(fsModule.promises, 'writeFile')
+      .mockRejectedValue(new Error('Permission denied'));
+
+    await expect(updateGitignore(scratchDir)).resolves.toBeUndefined();
+    expect(consoleSpy).toHaveBeenCalledWith(
+      'Failed to update .gitignore:',
+      expect.any(Error),
+    );
+
+    writeFileSpy.mockRestore();
+    consoleSpy.mockRestore();
   });
 });

packages/cli/src/ui/commands/setupGithubCommand.ts

@@ -44,6 +44,46 @@ function getOpenUrlsCommands(readmeUrl: string): string[] {
   return commands;
 }
 
+// Add Gemini CLI specific entries to .gitignore file
+export async function updateGitignore(gitRepoRoot: string): Promise<void> {
+  const gitignoreEntries = ['.gemini/', 'gha-creds-*.json'];
+
+  const gitignorePath = path.join(gitRepoRoot, '.gitignore');
+  try {
+    // Check if .gitignore exists and read its content
+    let existingContent = '';
+    let fileExists = true;
+    try {
+      existingContent = await fs.promises.readFile(gitignorePath, 'utf8');
+    } catch (_error) {
+      // File doesn't exist
+      fileExists = false;
+    }
+
+    if (!fileExists) {
+      // Create new .gitignore file with the entries
+      const contentToWrite = gitignoreEntries.join('\n') + '\n';
+      await fs.promises.writeFile(gitignorePath, contentToWrite);
+    } else {
+      // Check which entries are missing
+      const missingEntries = gitignoreEntries.filter(
+        (entry) =>
+          !existingContent
+            .split(/\r?\n/)
+            .some((line) => line.split('#')[0].trim() === entry),
+      );
+
+      if (missingEntries.length > 0) {
+        const contentToAdd = '\n' + missingEntries.join('\n') + '\n';
+        await fs.promises.appendFile(gitignorePath, contentToAdd);
+      }
+    }
+  } catch (error) {
+    console.debug('Failed to update .gitignore:', error);
+    // Continue without failing the whole command
+  }
+}
+
 export const setupGithubCommand: SlashCommand = {
   name: 'setup-github',
   description: 'Set up GitHub Actions',
@@ -146,11 +186,14 @@ export const setupGithubCommand: SlashCommand = {
       abortController.abort();
     });
 
+    // Add entries to .gitignore file
+    await updateGitignore(gitRepoRoot);
+
     // Print out a message
     const commands = [];
     commands.push('set -eEuo pipefail');
     commands.push(
-      `echo "Successfully downloaded ${workflows.length} workflows. Follow the steps in ${readmeUrl} (skipping the /setup-github step) to complete setup."`,
+      `echo "Successfully downloaded ${workflows.length} workflows and updated .gitignore. Follow the steps in ${readmeUrl} (skipping the /setup-github step) to complete setup."`,
     );
     commands.push(...getOpenUrlsCommands(readmeUrl));