From dab96a267eeccd7380ad99fa19cefdfd3cd5ad2b Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Fri, 22 Apr 2011 10:49:55 -0500
Subject: [PATCH] Add shorthand for js and css compressors

---
 actionpack/lib/sprockets/railtie.rb           | 37 +++++++++++++++++++
 .../lib/rails/application/configuration.rb    |  3 ++
 2 files changed, 40 insertions(+)

diff --git a/actionpack/lib/sprockets/railtie.rb b/actionpack/lib/sprockets/railtie.rb
index ccec65ba95..9c10decd60 100644
--- a/actionpack/lib/sprockets/railtie.rb
+++ b/actionpack/lib/sprockets/railtie.rb
@@ -57,7 +57,44 @@ module Sprockets
       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::JavaScriptCompressor.new(:munge => true)
+      else
+        sym
+      end
+    end
   end
 end
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index bd8c314da6..f818313955 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -35,6 +35,9 @@ module Rails
         @assets.paths      = []
         @assets.precompile = [ /\w+\.(?!js|css)$/, "application.js", "application.css" ]
         @assets.prefix     = "/assets"
+
+        @assets.js_compressor  = nil
+        @assets.css_compressor = nil
       end
 
       def compiled_asset_path