gulpfile.js

var gulp    = require('gulp'),
$           = require('gulp-load-plugins')(),
meta        = require('./package.json');

var argv    = require('minimist')(process.argv.slice(2));

var jsDir   = 'src/js/',
sassDir     = 'src/sass/',
fontsDir    = 'src/fonts/',
distDir     = 'build',
banner      = [
    '/*!',
    ' * =============================================================',
    ' * <%= name %> v<%= version %> - <%= description %>',
    ' * <%= homepage %>',
    ' *',
    ' * (c) 2017 - <%= author %>',
    ' * =============================================================',
    ' */\n\n'
].join('\n'),
umdDeps = {
    dependencies: function() {
        return [
            {
                name: '$',
                amd: 'jquery',
                cjs: 'jquery',
                global: 'jQuery',
                param: '$'
            }
        ];
    }
};

var onError = function (err) {
    $.util.beep();
    console.log(err.toString());
    this.emit('end');
};

gulp.task('fonts', function() {
    return gulp.src(fontsDir + '**/*')
        .pipe(gulp.dest(distDir + "/fonts"));
});

gulp.task('sass', function() {
    return gulp.src(sassDir + '*.scss')
        .pipe($.plumber({ errorHandler: onError }))
        .pipe($.sass())
        .pipe($.autoprefixer())
        .pipe($.header(banner, meta))
        .pipe($.if(!argv.dev, $.minifyCss()))
        .pipe($.if(!argv.dev, $.rename(meta.name + '.min.css')))
        .pipe($.if(!argv.dev, gulp.dest(distDir + "/css")));
});

gulp.task('scripts', function() {
    return gulp.src([jsDir + '*.js'])
        .pipe($.plumber({ errorHandler: onError }))
        .pipe($.umd(umdDeps))
        .pipe($.header(banner, meta))
        .pipe($.rename(meta.name + '.js'))
        .pipe($.if(!argv.dev, $.uglify()))
        .pipe($.if(!argv.dev, $.header(banner, meta)))
        .pipe($.if(!argv.dev, $.rename(meta.name + '.min.js')))
        .pipe($.if(!argv.dev, gulp.dest(distDir + "/js")));
});


gulp.task('default', ['sass', 'scripts', 'fonts'], function() {
    gulp.watch(jsDir + '**/*.js', ['scripts']);
    gulp.watch(sassDir + '**/*.scss', ['sass']);
});

gulp.task('build', ['sass', 'scripts', 'fonts']);