gulpfile.js


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// include gulp
var gulp = require('gulp');

// include plugins
var jshint = require('gulp-jshint');
var changed = require('gulp-changed');
var minifyHTML = require('gulp-minify-html');
var concat = require('gulp-concat');
var stripDebug = require('gulp-strip-debug');
var uglify = require('gulp-uglify');
var autoprefix = require('gulp-autoprefixer');
var minifyCSS = require('gulp-minify-css');

// JS hint task
gulp.task('jshint', function(){
    gulp.src('./src/scripts/*.js')
        .pipe(jshint())
        .pipe(jshint.reporter('default'));
});

// minify new/changed HTML
gulp.task('htmlpage', function(){
    var src = './src/*.html';
    var dst = './build';
    gulp.src(src)
        .pipe(changed(dst))
        .pipe(minifyHTML())
        .pipe(gulp.dest(dst));
});

// JS concat, strip debugging and minify
gulp.task('scripts', function(){
    gulp.src(['./src/scripts/lib.js', './src/scripts/*.js'])
        .pipe(concat('script.js'))
	.pipe(stripDebug())
	.pipe(uglify())
	.pipe(gulp.dest('./build/scripts'));
});

// CSS concat, auto-prefix and minify
gulp.task('styles', function(){
    gulp.src(['./src/styles/*.css'])
        .pipe(concat('styles.css'))
        .pipe(autoprefix('last 2 versions'))
        .pipe(minifyCSS())
        .pipe(gulp.dest('./build/styles/'));
});