gulpfile.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var stylus = require('gulp-stylus');
var minifyCSS = require('gulp-minify-css');
var watch = require('gulp-watch');

gulp.task('copyLibs', function() {
  gulp.src([
    'bower_components/backbone/backbone.js',
    'bower_components/marionette/lib/backbone.marionette.js',
    'bower_components/backbone.radio/build/backbone.radio.js',
    'bower_components/Backbone.localStorage/backbone.localStorage.js'
  ])
    .pipe(gulp.dest('public/dist'));
});

gulp.task('concatJS', function() {
  return gulp.src([
    'public/javascripts/**/*.js'
  ])
    .pipe(concat('meetingBookerBundle.js'))
    .pipe(gulp.dest('public/dist'));
});

gulp.task('uglifyJS', function() {
  return gulp.src([
    'bower_components/jquery/dist/jquery.js',
    'bower_components/pickadate/lib/picker.js',
    'bower_components/pickadate/lib/picker.date.js',
    'bower_components/pickadate/lib/picker.time.js',
    'bower_components/pickadate/lib/legacy.js',
    'bower_components/semantic-ui/build/packaged/javascript/semantic.min.js',
    'bower_components/json2/json2.js,',
    'bower_components/underscore/underscore.js'
  ])
    .pipe(concat('bundle.js'))
    .pipe(uglify())
    .pipe(gulp.dest('public/dist'));
});

gulp.task('compileCSS', function () {
  return gulp.src([
    'public/stylesheets/*.styl'
  ])
    .pipe(stylus())
    .pipe(gulp.dest('public/stylesheets'));
});

gulp.task('minifyCSS', function() {
  return gulp.src([
    'bower_components/pickadate/lib/themes/default.css',
    'bower_components/pickadate/lib/themes/default.date.css',
    'bower_components/pickadate/lib/themes/default.time.css',
    'bower_components/semantic-ui/build/packaged/css/semantic.min.css',
    'public/stylesheets/*.css'
  ])
    .pipe(concat('bundle.css'))
    .pipe(minifyCSS({keepBreaks:true}))
    .pipe(gulp.dest('public/dist'));
});

gulp.task('build', function() {
  return gulp.src([
    'bower_components/jquery/dist/jquery.js',
    'bower_components/pickadate/lib/picker.js',
    'bower_components/pickadate/lib/picker.date.js',
    'bower_components/pickadate/lib/picker.time.js',
    'bower_components/pickadate/lib/legacy.js',
    'bower_components/semantic-ui/build/packaged/javascript/semantic.min.js',
    'bower_components/json2/json2.js,',
    'bower_components/underscore/underscore.js',
    'bower_components/backbone/backbone.js',
    'bower_components/marionette/lib/backbone.marionette.js',
    'bower_components/backbone.radio/build/backbone.radio.js',
    'bower_components/Backbone.localStorage/backbone.localStorage-min.js',
    'public/javascripts/**/*.js'
  ])
    .pipe(concat('bundle.js'))
    .pipe(uglify())
    .pipe(gulp.dest('public/dist'));
});

gulp.task('watch', function() {
  gulp.watch('public/stylesheets/**.styl', ['compileCSS', 'minifyCSS']);
  gulp.watch('public/javascripts/**/*.js', ['concatJS']);
});

gulp.task('default', ['watch']);