gulpfile.js

var gulp = require('gulp');
var gutil = require('gulp-util');
var uglify = require('gulp-uglify');
var imagemin = require('gulp-imagemin');
var coffee = require('gulp-coffee');
var stylus = require('gulp-stylus');

// Copy assets
gulp.task('assets', function() {
    gulp.src('client/assets/**')
	.pipe(gulp.dest('./'));
});

// Get and render all .styl files recursively 
gulp.task('stylus', function () {
    gulp.src('client/css/**/*.styl')
        .pipe(stylus())
        .pipe(gulp.dest('./css'));
});

gulp.task('coffee', function() {
  gulp.src('client/js/*.coffee')
    .pipe(coffee({bare: true}).on('error', gutil.log))
    .pipe(gulp.dest('./js'))
});

gulp.task('images', function(){
    return gulp.src('client/assets/img/**')
    	// Pass in options to the task
        .pipe(imagemin({optimizationLevel: 5}))
        .pipe(gulp.dest('img'));
});

gulp.task('scripts', function() {
  // Minify and copy all JavaScript (except vendor scripts)
  return gulp.src(['client/js/*.js'])
    .pipe(uglify())
    .pipe(gulp.dest('js'));
});

// Rerun the task when a file changes
gulp.task('watch', function () {
  gulp.watch('client/js/**', ['coffee', 'scripts']);
  gulp.watch('client/img/**', ['images']);
  gulp.watch('client/css/**', ['stylus']);
  gulp.watch('client/assets/**', ['assets']);
});

// The default task (called when you run `gulp` from cli)
gulp.task('default', ['assets', 'coffee', 'scripts', 'images', 'stylus', 'watch']);