gulpfile.js

// Modules
var gulp        = require('gulp');
var nodemon     = require('gulp-nodemon');
var jshint      = require('gulp-jshint');
var uglify      = require('gulp-uglify');
var browserify  = require('browserify');
var watchify    = require('watchify');
var envify      = require('envify');
var source      = require('vinyl-source-stream');
var buffer      = require('vinyl-buffer');
var notify      = require('gulp-notify');
var gutil       = require('gulp-util');

// TODO: determine when to set the environment to 'production'
// process.env.NODE_ENV = 'production';
//********************************************************************

var production  = process.env.NODE_ENV === 'production';

function handleError (task)
{
	return function (err)
	{
		gutil.log(gutil.colors.red(err));
		notify.onError(task + ' failed, check the logs...')(err);
	};
}

gulp.task('lint', function ()
{
	gulp.src([ './app/**/*.js', './config/**/*.js', './src/**/*.js' ], { base: __dirname })
		.pipe(jshint('.jshintrc'))
		.pipe(jshint.reporter('jshint-stylish'));
});

gulp.task('watch', function ()
{
	gulp.watch([ './app/**/*.js', './config/**/*.js', './src/**/*.js' ], [ 'lint' ]);
	gutil.log('Linting...');
});

gulp.task('nodemon', [ 'scripts' ], function ()
{
	nodemon(
	{
		script: 'app.js',
		ext: 'html js',
		env: { NODE_ENV: 'development' },
		nodeArgs: [ '--debug' ],
		stdout: false,
		stderr: false,
		watch: [ 'app/' ]
	})
	.on('restart', function (files)
	{
		gutil.log('[server] App restarted due to: ', gutil.colors.cyan(files));
	})
	.on('stdout', function (raw)
	{
		var msg = raw.toString('utf8');
		gutil.log('[server]', gutil.colors.green(msg));
	})
	.on('stderr', function (err)
	{
		var msg = err.toString('utf8');

		// For some reason debugger attachment gets logged on 'stderr', so we catch it here...
		if (msg.indexOf('Debugger listening on port') === 0)
		{
			gutil.log('[server]', gutil.colors.green(msg));
		} 
		else 
		{
			handleError('Node server')(msg);
		}
	});
});

function buildScript (watching)
{
	// Browserify Options
	var bundler = browserify(
	{
		basedir: __dirname,
		debug: !production,
		entries: './src/app.js',
		cache: {},
		packageCache: {},
		fullPaths: watching
	});

	// Watchify if watching requested
	if (watching)
	{
		bundler = watchify(bundler);
		gutil.log('Watchifying...');
	}
	
	// Transform NODE_ENV variables to strings with Envify
	bundler.transform({ global: true }, envify);

	// Uglify and Output
	function rebundle ()
	{
		var start = Date.now();

		var stream = bundler.bundle();
		stream.on('error', handleError('Browserify'));
		
		if (production)
		{
			return stream.pipe(source('bundle.js')) // gives streaming vinyl file object
				.pipe(buffer()) // convert from streaming to buffered vinyl file object
				.pipe(uglify())
				.pipe(gulp.dest('./public'))
				.pipe(notify(function ()
				{
					gutil.log('Bundled (minified) in ' + (Date.now() - start) + 'ms');
				}));
		}
		else
		{
			return stream.pipe(source('bundle.js')) // gives streaming vinyl file object
				.pipe(gulp.dest('./public'))
				.pipe(notify(function ()
				{
					gutil.log('Bundled (debug) in ' + (Date.now() - start) + 'ms');
				}));
		}
	}

	// listen for an update and run rebundle
	bundler.on('update', function ()
	{
		rebundle();
		gutil.log('Rebundling...');
	});

	return rebundle();
}

// run once
gulp.task('scripts', function ()
{
	return buildScript(false);
});

// run 'scripts' task first, then watch for future changes
gulp.task('default', [ 'watch', 'lint', 'nodemon' ], function ()
{
	return buildScript(true);
});