Use coffee script for gulp

gulp/build.coffee

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+gulp = require 'gulp'
+
+gulp.task 'build', ['clean', 'styles', 'scripts', 'fonts', 'images']

gulp/clean.coffee

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+gulp = require 'gulp'
+del = require 'del'
+
+gulp.task 'clean', ->
+    del.sync 'output_*/assets/{css,fonts,images,js}'
+    del.sync gulp.config.outputDir + '/{css,fonts,images,js}'

gulp/default.coffee

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+gulp = require 'gulp'
+
+gulp.task 'default', ['build', 'watch']

gulp/fonts.coffee

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+gulp = require 'gulp'
+
+gulp.task 'fonts', ->
+    gulp.src gulp.config.bowerDir + '/font-awesome/fonts/*'
+        .pipe gulp.dest gulp.config.outputDir + '/fonts'

gulp/images.coffee

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+gulp = require 'gulp'
+
+gulp.task 'images', -> gulp.start 'copy-images', 'meetup-thumbnails'
+
+gulp.task 'meetup-thumbnails', ->
+    gulp.src gulp.config.assetsDir + '/images/meetups/originals/*'
+        .pipe gulp.plugins.imageResize height: '80'
+        .pipe gulp.dest gulp.config.outputDir + '/images/meetups/thumbnails'
+
+gulp.task 'copy-images', ->
+    gulp.copy gulp.config.assetsDir + '/images/**/*', gulp.config.outputDir + '/images'

gulp/minify-prod-html.coffee

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+gulp = require 'gulp'
+
+gulp.task 'minify-prod-html', ->
+  gulp.src 'output_prod/**/*.html'
+      .pipe gulp.plugins.htmlmin 'collapseWhitespace': true
+      .pipe gulp.dest 'output_prod'

gulp/scripts.coffee

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+gulp = require 'gulp'
+
+gulp.task 'scripts', ->
+    gulp.js [
+        gulp.config.bowerDir + '/jquery/dist/jquery.js',
+        gulp.config.bowerDir + '/bootstrap-sass/assets/javascripts/bootstrap.js',
+        gulp.config.assetsDir + '/' + gulp.config.jsPattern
+    ], 'site.js'

gulp/styles.coffee

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+gulp = require 'gulp'
+
+gulp.task 'styles', ->
+    gulp.css [
+      gulp.config.bowerDir + '/font-awesome/css/font-awesome.css',
+      gulp.config.assetsDir + '/sass/site.sass'
+    ], 'site.css'

gulp/watch.coffee

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+gulp = require 'gulp'
+
+gulp.task 'watch', ->
+    gulp.watch gulp.config.sassPattern, ['styles']
+    gulp.watch gulp.config.assetsDir + gulp.config.jsPattern, ['scripts']

gulpfile.coffee

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+gulp = require 'gulp'
+gulp.plugins = require('gulp-load-plugins')()
+
+gulp.config =
+    assetsDir: './assets',
+    bowerDir: './vendor/bower',
+    outputDir: './source/assets',
+    sassPattern: './assets/sass/**/*.sass',
+    jsPattern: 'js/**/*.js',
+    production: !!gulp.plugins.util.env.production,
+    sourceMaps: !gulp.plugins.util.env.production,
+    liveReload: !gulp.plugins.util.env.production,
+    notify: !gulp.plugins.util.env.production
+
+gulp.css = (paths, filename) ->
+    gulp.src paths
+        .pipe gulp.plugins.plumber()
+        .pipe gulp.plugins.if gulp.config.sourceMaps, gulp.plugins.sourcemaps.init()
+        .pipe gulp.plugins.sassGlob()
+        .pipe gulp.plugins.sass()
+        .pipe gulp.plugins.autoprefixer browsers: ['last 2 versions']
+        .pipe gulp.plugins.concat filename
+        .pipe gulp.config.production ? gulp.plugins.cleanCss() || gulp.plugins.util.noop()
+        .pipe gulp.plugins.if gulp.config.sourceMaps, gulp.plugins.sourcemaps.write '.'
+        .pipe gulp.dest gulp.config.outputDir + '/css'
+        # .pipe gulp.config.notify ? gulp.plugins.notify() || gulp.plugins.util.noop()
+        # .pipe gulp.plugins.if gulp.config.liveReload, gulp.plugins.livereload()
+
+gulp.js = (paths, filename) ->
+    gulp.src paths
+        .pipe gulp.plugins.plumber()
+        .pipe gulp.plugins.if gulp.config.sourceMaps, gulp.plugins.sourcemaps.init()
+        .pipe gulp.plugins.concat filename
+        .pipe gulp.config.production ? gulp.plugins.uglify() || gulp.plugins.util.noop()
+        .pipe gulp.plugins.if gulp.config.sourceMaps, gulp.plugins.sourcemaps.write '.'
+        .pipe gulp.dest gulp.config.outputDir + '/js'
+        # .pipe gulp.config.notify ? gulp.plugins.notify() || gulp.plugins.util.noop()
+
+gulp.copy = (srcFiles, outputDir) ->
+    gulp.src srcFiles
+        .pipe gulp.dest outputDir
+
+require("fs").readdirSync("./gulp").forEach (task) -> require "./gulp/#{task}"

gulpfile.js

@@ -1,109 +0,0 @@
-'use strict';
-
-var gulp = require('gulp');
-var plugins = require('gulp-load-plugins')();
-var del = require('del');
-
-var config = {
-  assetsDir: './assets',
-  bowerDir: './vendor/bower',
-  outputDir: './source/assets',
-  sassPattern: './assets/sass/**/*.sass',
-  jsPattern: 'js/**/*.js',
-  production: !!plugins.util.env.production,
-  sourceMaps: !plugins.util.env.production,
-  liveReload: !plugins.util.env.production,
-  notify: !plugins.util.env.production
-};
-
-var app = {};
-
-app.css = function (paths, filename) {
-    gulp.src(paths)
-        .pipe(plugins.plumber())
-        .pipe(plugins.if(config.sourceMaps, plugins.sourcemaps.init()))
-        .pipe(plugins.sourcemaps.init())
-        .pipe(plugins.sassGlob())
-        .pipe(plugins.sass())
-        .pipe(plugins.autoprefixer({
-            browsers: ['last 2 versions']
-        }))
-        .pipe(plugins.concat(filename))
-        .pipe(config.production ? plugins.cleanCss() : plugins.util.noop())
-        .pipe(plugins.if(config.sourceMaps, plugins.sourcemaps.write('.')))
-        .pipe(gulp.dest(config.outputDir + '/css'))
-        .pipe(config.notify ? plugins.notify() : plugins.util.noop())
-        .pipe(plugins.if(config.liveReload, plugins.livereload()));
-};
-
-app.js = function (paths, filename) {
-    gulp.src(paths)
-        .pipe(plugins.plumber())
-        .pipe(plugins.if(config.sourceMaps, plugins.sourcemaps.init()))
-        .pipe(plugins.sourcemaps.init())
-        .pipe(plugins.concat(filename))
-        .pipe(config.production ? plugins.uglify() : plugins.util.noop())
-        .pipe(plugins.if(config.sourceMaps, plugins.sourcemaps.write('.')))
-        .pipe(gulp.dest(config.outputDir + '/js'))
-        .pipe(config.notify ? plugins.notify() : plugins.util.noop());
-};
-
-app.copy = function (srcFiles, outputDir) {
-    gulp.src(srcFiles)
-        .pipe(gulp.dest(outputDir));
-};
-
-gulp.task('styles', function () {
-    app.css([
-      config.bowerDir + '/font-awesome/css/font-awesome.css',
-      config.assetsDir + '/sass/site.sass'
-    ], 'site.css');
-});
-
-gulp.task('scripts', function () {
-    app.js([
-        config.bowerDir + '/jquery/dist/jquery.js',
-        config.bowerDir + '/bootstrap-sass/assets/javascripts/bootstrap.js',
-        config.assetsDir + '/' + config.jsPattern
-    ], 'site.js');
-});
-
-gulp.task('watch', function () {
-    gulp.watch(config.sassPattern, ['styles']);
-    gulp.watch(config.assetsDir + config.jsPattern, ['scripts']);
-});
-
-gulp.task('clean', function () {
-    del.sync('output_*/assets/{css,fonts,images,js}');
-    del.sync(config.outputDir + '/{css,fonts,images,js}');
-});
-
-gulp.task('fonts', function () {
-    app.copy(config.bowerDir + '/font-awesome/fonts/*', config.outputDir + '/fonts');
-});
-
-gulp.task('meetup-thumbnails', function () {
-    gulp.src(config.assetsDir + '/images/meetups/originals/*')
-        .pipe(plugins.imageResize({
-            height: '80'
-        }))
-        .pipe(gulp.dest(config.outputDir + '/images/meetups/thumbnails'))
-});
-
-gulp.task('copy-images', function () {
-    app.copy(config.assetsDir + '/images/**/*', config.outputDir + '/images');
-});
-
-gulp.task('images', ['meetup-thumbnails', 'copy-images']);
-
-gulp.task('build', ['clean', 'styles', 'scripts', 'fonts', 'images']);
-
-gulp.task('default', ['build', 'watch']);
-
-gulp.task('minify-prod-html', function () {
-  gulp.src('output_prod/**/*.html')
-      .pipe(plugins.htmlmin({
-          'collapseWhitespace': true
-      }))
-      .pipe(gulp.dest('output_prod'));
-});