module Sprockets class Railtie < Rails::Railtie def self.using_coffee? require 'coffee-script' defined?(CoffeeScript) rescue LoadError false end def self.using_scss? require 'sass' defined?(Sass) rescue LoadError false end config.app_generators.javascript_engine :coffee if using_coffee? config.app_generators.stylesheet_engine :scss if using_scss? # Configure ActionController to use sprockets. initializer "sprockets.set_configs", :after => "action_controller.set_configs" do |app| ActiveSupport.on_load(:action_controller) do self.use_sprockets = app.config.assets.enabled end end # We need to configure this after initialization to ensure we collect # paths from all engines. This hook is invoked exactly before routes # are compiled. config.after_initialize do |app| assets = app.config.assets next unless assets.enabled app.assets = asset_environment(app) ActiveSupport.on_load(:action_view) do app.assets.context_class.instance_eval do include ::ActionView::Helpers::SprocketsHelper end end app.routes.prepend do mount app.assets => assets.prefix end if config.action_controller.perform_caching app.assets = app.assets.index end end protected def asset_environment(app) require "sprockets" assets = app.config.assets env = Sprockets::Environment.new(app.root.to_s) env.static_root = File.join(app.root.join("public"), assets.prefix) env.paths.concat assets.paths env.logger = Rails.logger env.js_compressor = expand_js_compressor(assets.js_compressor) env.css_compressor = expand_css_compressor(assets.css_compressor) env end def expand_js_compressor(sym) case sym when :closure require 'closure-compiler' Closure::Compiler.new when :uglifier require 'uglifier' Uglifier.new when :yui require 'yui/compressor' YUI::JavaScriptCompressor.new else sym end end def expand_css_compressor(sym) case sym when :scss require 'sass' compressor = Object.new def compressor.compress(source) Sass::Engine.new(source, :syntax => :scss, :style => :compressed ).render end compressor when :yui require 'yui/compressor' YUI::CssCompressor.new else sym end end end end