Use coffeescript again for Gulp

gulpfile.coffee

@@ -0,0 +1,54 @@
+'use strict'
+
+global.gulp = require 'gulp'
+global.plugins = require('gulp-load-plugins')()
+
+global.config =
+    autoprefixer:
+        browsers: 'last 2 versions'
+    bowerDir: 'vendor/bower',
+    fonts:
+        outputDir: 'source/assets/fonts'
+    htmlmin:
+        collapseWhitespace: true
+    js:
+        sourceDir: 'assets/js',
+        pattern: '/js/**/*.js',
+        outputDir: 'source/assets/js'
+    production: plugins.util.env.production || false
+    sass:
+        sourceDir: 'assets/sass',
+        pattern: '/**/*.sass',
+        outputDir: 'source/assets/css'
+    scss:
+        pattern: '/**/*.scss'
+
+global.app = {}
+
+app.sass = (paths, filename) ->
+    gulp.src paths
+        .pipe plugins.plumber()
+        .pipe plugins.if !config.production, plugins.sourcemaps.init()
+        .pipe plugins.sassGlob()
+        .pipe plugins.sass()
+        .pipe plugins.autoprefixer config.autoprefixer
+        .pipe plugins.concat filename
+        .pipe plugins.if config.production, plugins.cleanCss()
+        .pipe plugins.if !config.production, plugins.sourcemaps.write('.')
+        .pipe plugins.if !config.production, plugins.refresh()
+        .pipe gulp.dest config.sass.outputDir
+
+app.js = (paths, filename) ->
+    gulp.src paths
+        .pipe plugins.plumber()
+        .pipe plugins.if !config.production, plugins.sourcemaps.init()
+        .pipe plugins.concat filename
+        .pipe plugins.if config.production, plugins.uglify()
+        .pipe plugins.if !config.production, plugins.sourcemaps.write('.')
+        .pipe gulp.dest config.js.outputDir
+
+app.copy = (source, destination) ->
+    gulp.src source
+        .pipe gulp.dest destination
+
+require('require-dir')('./gulp')