var gulp = require('gulp');

var cleanCSS = require('gulp-clean-css');

var sourcemaps = require('gulp-sourcemaps');

var watch = require('gulp-watch');

var uglify = require('gulp-uglify');

var pump = require('pump');

var imagemin = require('gulp-imagemin');

var optipng = require('imagemin-optipng');

//Javascript

gulp.task('minify-js', function (cb) {

pump([

gulp.src('assets/app/js/*.js'),

uglify(),

gulp.dest('assets/js')

],

cb

);

});

//CSS

gulp.task('minify-css', function() {

return gulp.src('assets/app/css/*.css')

.pipe(sourcemaps.init())

.pipe(cleanCSS({compatibility: 'ie8'}))

.pipe(sourcemaps.write())

.pipe(gulp.dest('assets/css'));

});

//IMG

gulp.task('minify-img-jpg', function() {

gulp.src('assets/app/img/*.jpg')

.pipe(imagemin())

.pipe(gulp.dest('assets/img'));

});

gulp.task('minify-img-png', function() {

return gulp.src('assets/app/img/*.png')

.pipe(optipng({ optimizationLevel: 3 })())

.pipe(gulp.dest('assets/img'));

});

gulp.task('default', function () {

//CSS

gulp.watch('assets/app/css/*.css', ['minify-css']);

//JS

gulp.watch('assets/app/js/*.js', ['minify-js']);

//IMG

gulp.watch('assets/app/img/*.jpg', ['minify-img-jpg']);

gulp.watch('assets/app/img/*.png', ['minify-img-png']);

});