Add --help and --version command line args

Fixes #378

package.json

@@ -85,7 +85,8 @@
     "typescript": "^1.7.3",
     "uglify-js": "2.4.8",
     "underscore": "^1.8.2",
-    "vinyl": "^0.4.5"
+    "vinyl": "^0.4.5",
+    "yargs": "^3.32.0"
   },
   "repository": {
     "type": "git",

src/vs/workbench/electron-main/bootstrap.js

@@ -10,6 +10,7 @@ global.vscodeStart = Date.now();
 
 var app = require('electron').app;
 var path = require('path');
+var process = require('process');
 var fs = require('fs');
 
 // Change cwd if given via env variable
@@ -19,6 +20,31 @@ try {
 	// noop
 }
 
+function parseArgs() {
+	var executable = 'code' + (os.platform() == 'win32' ? '.exe' : '');
+	var options = require('yargs')(process.argv.slice(1));
+	options.usage(
+		'Visual Studio Code v' + app.getVersion() + '\n' +
+		'\n' +
+		'Usage: ' + executable + ' [arguments] [path]');
+	options.alias('h', 'help').boolean('h').describe('h', 'Print usage.');
+	options.string('locale').describe('locale', 'Use a specific locale.');
+	options.boolean('n').describe('n', 'Force a new instance of code.');
+	options.alias('v', 'version').boolean('v').describe('v', 'Print version.');
+
+	var args = options.argv;
+	if (args.help) {
+		process.stdout.write(options.help());
+		process.exit(0);
+	}
+	if (args.version) {
+		process.stdout.write(app.getVersion());
+		process.exit(0);
+	}
+}
+
+parseArgs();
+
 // Set path according to being built or not
 if (!!process.env.VSCODE_DEV) {
 	var appData = app.getPath('appData');