gulpfile-original.js

var gulp = require('gulp');
var util = require('gulp-util');
var concat = require('gulp-concat');
var minifycss = require('gulp-minify-css');
var uglify = require('gulp-uglify');
var imagemin = require('gulp-imagemin');

// assets is where you define your application assets and you can pass them into gulp.
var assets = require('./assets');

// change the working directory to the public folder, where your assets are located.
var gulpFileCwd = __dirname +'/public';
process.chdir(gulpFileCwd);

// print the working directory
util.log('Working directory changed to', util.colors.magenta(gulpFileCwd));

// the build task
gulp.task('build', function() {

  // concat and minify your css
  gulp.src(assets.development.css)
  .pipe(concat('styles.css'))
  .pipe(minifycss())
  .pipe(gulp.dest('./css/'));

  // concat and minify your js
  gulp.src(assets.development.js)
  .pipe(concat('scripts.js'))
  .pipe(uglify())
  .pipe(gulp.dest('./js/'));

  // optimize your images
  gulp.src('./img/*')
  .pipe(imagemin())
  .pipe(gulp.dest('./img/'));

});

// the default task that is run with the command 'gulp'
gulp.task('default', ['build']);