Gulp file

gulpfile.js

/*
 * Task runner
 *
 */

// Load the plugins
//
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    jshint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    imagemin = require('gulp-imagemin'),
    rename = require('gulp-rename'),
    clean = require('gulp-clean'),
    concat = require('gulp-concat'),
    notify = require('gulp-notify'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload');

// compile and minify scss file to css file
//
gulp.task('styles', function() {
  return gulp.src('src/styles/main.scss')
    .pipe(sass({ style: 'expanded' }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(gulp.dest('public/css'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(minifycss())
    .pipe(gulp.dest('public/css'))
    .pipe(notify({ message: 'Styled task done' }));
});

// JSHint, concat and minify the JavaScript file
//
gulp.task('scripts', function() {
  return gulp.src('src/scripts/**/*.js')
    .pipe(jshint('.jshintrc'))
    .pipe(jshint.reporter('default'))
    .pipe(concat('app.js'))
    .pipe(gulp.dest('public/js'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(uglify())
    .pipe(gulp.dest('public/js'))
    .pipe(notify({ message: 'JavaScriptes task done' }));
});

// Image compression
//
gulp.task('images', function() {
  return gulp.src('src/img/**/*')
    .pipe(cache(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true })))
    .pipe(gulp.dest('public/img'))
    .pipe(notify({ message: 'Images task done' }));
});

// Clean up
//
gulp.task('clean', function() {
  return gulp.src(['public/css', 'public/js', 'public/img'], {read: false})
    .pipe(clean());
});

// The default task is to run all the task
//
gulp.task('default', ['clean'], function() {
  gulp.start('styles', 'scripts', 'images')
});

// Watch changes on source files and run the right tasks
//
gulp.task('watch', function() {
  gulp.watch('src/styles/**/*.scss', ['styles']);
  gulp.watch('src/scripts/**/*.js', ['scripts']);
  gulp.watch('src/images/**/*', ['images']);

  // Browser auto reload
  var server = livereload();
  gulp.watch(['src/**']).on('change', function(file) {
    server.change(file.path);
  });
});