Add buildable CLI application with Node.js

Co-authored-by: CarlSp8 <249240924+CarlSp8@users.noreply.github.com>

.gitignore

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+# Dependencies
+node_modules/
+
+# Build output
+dist/
+build/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# IDE files
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Environment files
+.env
+.env.local
+
+# Logs
+*.log
+npm-debug.log*
+
+# Test coverage
+coverage/
+
+# Temporary files
+tmp/
+temp/

package.json

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+{
+  "name": "@github/copilot",
+  "version": "0.1.0",
+  "description": "GitHub Copilot CLI brings the power of Copilot coding agent directly to your terminal.",
+  "main": "src/index.js",
+  "bin": {
+    "copilot": "src/index.js"
+  },
+  "scripts": {
+    "start": "node src/index.js",
+    "build": "echo 'No build step required for this JavaScript CLI'",
+    "test": "node --test"
+  },
+  "keywords": [
+    "github",
+    "copilot",
+    "cli",
+    "ai",
+    "assistant"
+  ],
+  "author": "GitHub",
+  "license": "SEE LICENSE IN LICENSE.md",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/github/copilot-cli.git"
+  },
+  "homepage": "https://docs.github.com/copilot/concepts/agents/about-copilot-cli",
+  "engines": {
+    "node": ">=18.0.0"
+  }
+}

src/index.js

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+#!/usr/bin/env node
+
+/**
+ * GitHub Copilot CLI
+ * Brings the power of GitHub Copilot coding agent directly to your terminal.
+ */
+
+const { version, description } = require('../package.json');
+
+const HELP_TEXT = `
+GitHub Copilot CLI - ${description}
+
+Usage: copilot [options] [command]
+
+Options:
+  -h, --help        Show this help message
+  -v, --version     Show version number
+  --banner          Show the animated banner on launch
+  --experimental    Enable experimental features
+
+Commands:
+  /login            Authenticate with GitHub
+  /logout           Sign out of GitHub
+  /model            Choose from available AI models
+  /feedback         Submit feedback
+  /lsp              View LSP server status
+  /experimental     Toggle experimental mode
+
+For more information, visit:
+  https://docs.github.com/copilot/concepts/agents/about-copilot-cli
+`;
+
+/**
+ * Parse command line arguments
+ * @param {string[]} args - Command line arguments
+ * @returns {Object} Parsed arguments
+ */
+function parseArgs(args) {
+  const parsed = {
+    help: false,
+    version: false,
+    banner: false,
+    experimental: false,
+    command: null
+  };
+
+  for (const arg of args) {
+    switch (arg) {
+      case '-h':
+      case '--help':
+        parsed.help = true;
+        break;
+      case '-v':
+      case '--version':
+        parsed.version = true;
+        break;
+      case '--banner':
+        parsed.banner = true;
+        break;
+      case '--experimental':
+        parsed.experimental = true;
+        break;
+      default:
+        if (!arg.startsWith('-') && !parsed.command) {
+          parsed.command = arg;
+        }
+        break;
+    }
+  }
+
+  return parsed;
+}
+
+/**
+ * Main entry point
+ */
+function main() {
+  const args = process.argv.slice(2);
+  const parsed = parseArgs(args);
+
+  // Handle version flag first
+  if (parsed.version) {
+    console.log(`GitHub Copilot CLI v${version}`);
+    process.exit(0);
+  }
+
+  // Handle explicit help flag
+  if (parsed.help) {
+    console.log(HELP_TEXT);
+    process.exit(0);
+  }
+
+  // Handle banner option
+  if (parsed.banner) {
+    console.log(`
+  ╔═══════════════════════════════════════════════╗
+  ║                                               ║
+  ║           GitHub Copilot CLI                  ║
+  ║                                               ║
+  ║    AI-powered coding assistance in your       ║
+  ║    terminal                                   ║
+  ║                                               ║
+  ╚═══════════════════════════════════════════════╝
+`);
+  }
+
+  if (parsed.experimental) {
+    console.log('Experimental mode enabled.');
+  }
+
+  // If we have a command, display placeholder message
+  if (parsed.command) {
+    console.log(`Command "${parsed.command}" is not yet implemented.`);
+    console.log('For full functionality, please install the complete GitHub Copilot CLI.');
+    console.log('Run "copilot --help" for more information.');
+    process.exit(1);
+  }
+
+  // Show help if no arguments provided and no flags were handled
+  if (args.length === 0) {
+    console.log(HELP_TEXT);
+    process.exit(0);
+  }
+}
+
+main();

test/cli.test.js

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+const { describe, it } = require('node:test');
+const assert = require('node:assert');
+const { execSync } = require('child_process');
+const path = require('path');
+
+const CLI_PATH = path.join(__dirname, '..', 'src', 'index.js');
+
+describe('GitHub Copilot CLI', () => {
+  describe('--version', () => {
+    it('should display version information', () => {
+      const output = execSync(`node ${CLI_PATH} --version`, { encoding: 'utf8' });
+      assert.match(output, /GitHub Copilot CLI v\d+\.\d+\.\d+/);
+    });
+  });
+
+  describe('--help', () => {
+    it('should display help information', () => {
+      const output = execSync(`node ${CLI_PATH} --help`, { encoding: 'utf8' });
+      assert.ok(output.includes('Usage: copilot [options] [command]'));
+      assert.ok(output.includes('--help'));
+      assert.ok(output.includes('--version'));
+    });
+  });
+
+  describe('-v shorthand', () => {
+    it('should display version with -v flag', () => {
+      const output = execSync(`node ${CLI_PATH} -v`, { encoding: 'utf8' });
+      assert.match(output, /GitHub Copilot CLI v\d+\.\d+\.\d+/);
+    });
+  });
+
+  describe('-h shorthand', () => {
+    it('should display help with -h flag', () => {
+      const output = execSync(`node ${CLI_PATH} -h`, { encoding: 'utf8' });
+      assert.ok(output.includes('Usage: copilot [options] [command]'));
+    });
+  });
+
+  describe('--banner', () => {
+    it('should display banner when --banner flag is used', () => {
+      const output = execSync(`node ${CLI_PATH} --banner`, { encoding: 'utf8' });
+      assert.ok(output.includes('GitHub Copilot CLI'));
+      assert.ok(output.includes('AI-powered coding assistance'));
+    });
+
+    it('should not display help when only --banner flag is used', () => {
+      const output = execSync(`node ${CLI_PATH} --banner`, { encoding: 'utf8' });
+      assert.ok(!output.includes('Usage: copilot [options] [command]'));
+    });
+  });
+
+  describe('no arguments', () => {
+    it('should display help when no arguments are provided', () => {
+      const output = execSync(`node ${CLI_PATH}`, { encoding: 'utf8' });
+      assert.ok(output.includes('Usage: copilot [options] [command]'));
+    });
+  });
+});