Add Processor for Google Stylesheets

README.md

@@ -1,6 +1,6 @@
 # Closure Sprockets
 
-Sprockets preprocessor for Google's [Closure tools](http://code.google.com/closure/) + Closure-templates (soy) compiler.
+Sprockets preprocessor for Google's [Closure tools](http://code.google.com/closure/) + Closure-templates (soy) compiler + Closure stylesheets (gss) compiler.
 
 ## Integrating with Rails 3
 
@@ -14,6 +14,9 @@ The gem ships with a Railtie which will automatically register a Closure preproc
 - [Download the latest version](http://code.google.com/closure/library/docs/gettingstarted.html) of closure library from Google and put it in `vendor/assets`
 - Write some closure code!
 
+
+### Javascripts
+
 ```js
 // in one of your javascript files
 goog.require('goog.dom');
@@ -44,6 +47,43 @@ goog.dom.appendChild(document.body, soy);
 
 That's it! Point your browser at your page and you should have a hello world greeting from Google Closure, preprocessed by the Rails 3 Asset Pipeline and without any external Python dependencies or dynamic Javascript loading.
 
+
+### Stylesheets
+
+You can use also [closure stylesheets](http://code.google.com/p/closure-stylesheets/) in .gss files
+
+```css
+/** style.gss **/
+
+@def BG_COLOR              rgb(235, 239, 249);
+
+@def DIALOG_BORDER_COLOR   rgb(107, 144, 218);
+@def DIALOG_BG_COLOR       BG_COLOR;
+
+body {
+  background-color: BG_COLOR;
+}
+
+.dialog {
+  background-color: DIALOG_BG_COLOR;
+  border: 1px solid DIALOG_BORDER_COLOR;
+}
+```
+
+GSS files will be compiled automatically to CSS:
+
+```css
+body {
+  background-color: #ebeff9;
+}
+.dialog {
+  background-color: #ebeff9;
+  border: 1px solid #6b90da;
+}
+```
+
+
+
 ## Optional configuration
 
 If you decided to put your `closure-library` directory somewhere other than `vendor/assets`, then you'll have to update your environment config with the right path:
@@ -76,4 +116,4 @@ If you are not using the closure compiler, then you may want to disable the dyna
 
 ### License
 
-(MIT License) - Copyright (c) 2011 Ilya Grigorik
+(MIT License) - Copyright (c) 2011 Ilya Grigorik

lib/closure-sprockets.rb

@@ -3,4 +3,5 @@
 require "closure-sprockets/version"
 require "closure-sprockets/directive_processor"
 require "closure-sprockets/soy_processor"
+require "closure-sprockets/gss_processor"
 require "closure-sprockets/railtie" if defined?(Rails)

lib/closure-sprockets/gss_processor.rb

@@ -0,0 +1,21 @@
+class GssTemplateProcessor < Tilt::Template
+  COMPILER_ROOT = File.expand_path(File.dirname(__FILE__))
+  COMPILER_JAR  = File.join(COMPILER_ROOT, "/../jar/closure-stylesheets.jar")
+
+  self.default_mime_type = 'text/css'
+
+  def self.engine_initialized?; true; end
+  def initialize_engine; end
+  def prepare; end
+
+  def evaluate(context, locals, &block)
+    # not the prettiest way to do this, but it works, for now...
+    out = file.gsub(/gss$/, 'css')
+    `java -jar #{COMPILER_JAR} --output-file #{out} --pretty-print #{file}`
+
+    @output = IO.read(out)
+    File.delete(out)
+
+    @output
+  end
+end

lib/closure-sprockets/railtie.rb

@@ -9,6 +9,7 @@ class Railtie < Rails::Engine
 
       app.assets.register_preprocessor 'application/javascript', ClosureDependenciesProcessor
       app.assets.register_engine '.soy', SoyTemplateProcessor
+      app.assets.register_engine '.gss', GssTemplateProcessor
     end
 
   end