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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
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