gulpfile.js

var gulp = require('gulp'),
	sass = require('gulp-sass'),
	browserSync = require('browser-sync'),
	concat = require('gulp-concat'),
	uglify = require('gulp-uglifyjs'),
	cssnano = require('gulp-cssnano'),
	rename = require('gulp-rename'),
	del = require('del'),
	imagemin = require('gulp-imagemin'),
	cache = require('gulp-cache'),
	autoprefixer = require('gulp-autoprefixer');

function swallowError(error) {
 console.log(error.toString());
 this.emit('end');
}

gulp.task('sass', function() {
	return gulp.src('src/sass/**/*.scss')
		 .pipe(sass())
		 .on('error', swallowError)
		 .pipe(autoprefixer(['last 15 versions', '> 1%', 'ie 8'], { cascade: true }))
		 .pipe(gulp.dest('src/css'))
		 .pipe(browserSync.reload({ stream: true }));
});

gulp.task('scripts', function() {
	return gulp.src([
		'src/libs/jquery/dist/jquery.min.js',
		'src/libs/bootstrap/dist/js/bootstrap.min.js',
		'src/libs/bootstrap-select/dist/js/bootstrap-select.min.js'
	])
	.pipe(concat('libs.min.js'))
	.pipe(uglify())
	.pipe(gulp.dest('src/js'));
});

gulp.task('css-libs', ['sass'], function() {
	return gulp.src('src/css/libs.css')
	.pipe(cssnano())
	.pipe(rename({ suffix: '.min' }))
	.pipe(gulp.dest('src/css'));
});

gulp.task('browser-sync', function() {
	browserSync({
		server: {
			baseDir: 'src'
		},
		notify: false
	});
});

gulp.task('dist-test', function() {
	browserSync({
		server: {
			baseDir: 'dist'
		},
		notify: false
	});
});

gulp.task('clean', function() {
	return del.sync('dist');
});

gulp.task('clear', function() {
	return cache.clearAll();
});

gulp.task('img', function() {
	return gulp.src('src/img/**/*')
		.pipe(cache(imagemin()))
		.pipe(gulp.dest('dist/img'));
});

gulp.task('watch', ['browser-sync', 'css-libs', 'scripts'], function() {
	gulp.watch('src/sass/**/*.scss', ['sass']);
	gulp.watch('src/*.html', browserSync.reload);
	gulp.watch('src/js/**/*.js', browserSync.reload);
});

gulp.task('build', ['clean', 'img', 'sass', 'scripts'], function() {
	var buildCss = gulp.src([
			'src/css/main.css',
			'src/css/libs.min.css'
		])
		.pipe(gulp.dest('dist/css'));

	var buildFonts = gulp.src('src/fonts/**/*')
					.pipe(gulp.dest('dist/fonts'));

	var buildJs = gulp.src('src/js/**/*')
				 .pipe(gulp.dest('dist/js'));

	var buildHtml = gulp.src('src/*.html')
				 .pipe(gulp.dest('dist'));
});