add soy / closure-template support

README.md

@@ -1,6 +1,6 @@
 # Closure Sprockets
 
-Sprockets preprocessor for Google's [Closure tools](http://code.google.com/closure/).
+Sprockets preprocessor for Google's [Closure tools](http://code.google.com/closure/) + Closure-templates (soy) compiler.
 
 ## Integrating with Rails 3
 
@@ -22,6 +22,26 @@ newHeader = goog.dom.createDom('h1', {}, 'Hello world!');
 goog.dom.appendChild(document.body, newHeader);
 ```
 
+You can also add a `name.soy` template in your assets folder, and it will be automatically compiled to Javascript for you! Ex:
+
+```js
+/** hello.soy */
+
+{namespace examples.simple}
+
+/**
+ * Says hello to the world.
+ */
+{template .helloSoy}
+  Hello from Soy!
+{/template}
+```
+
+```js
+var soy = goog.dom.createDom('h1', {'style': 'background-color:#EEE'}, examples.simple.helloSoy());
+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.
 
 ## Optional configuration

lib/closure-sprockets.rb

@@ -1,5 +1,6 @@
 require "tilt"
 
 require "closure-sprockets/version"
-require "closure-sprockets/processor"
-require "closure-sprockets/railtie" if defined?(Rails)
+require "closure-sprockets/directive_processor"
+require "closure-sprockets/soy_processor"
+require "closure-sprockets/railtie" if defined?(Rails)

lib/closure-sprockets/processor.rb → lib/closure-sprockets/directive_processor.rb

@@ -3,6 +3,7 @@ def prepare; end
 
   def evaluate(context, locals, &block)
     context.require_asset 'goog/base'
+    context.require_asset 'soyutils'
 
     data.lines.each do |line|
 

lib/closure-sprockets/railtie.rb

@@ -1,11 +1,14 @@
 module ClosureProcessor
-  class Railtie < Rails::Railtie
+  class Railtie < Rails::Engine
     config.closure = ActiveSupport::OrderedOptions.new
     config.closure.lib = 'vendor/assets/closure-library/closure'
 
     initializer :setup_closure do |app|
       app.assets.append_path config.closure.lib
+      app.assets.append_path 'vendor/assets'
+
       app.assets.register_preprocessor 'application/javascript', ClosureDependenciesProcessor
+      app.assets.register_engine '.soy', SoyTemplateProcessor
     end
 
   end

lib/closure-sprockets/soy_processor.rb

@@ -0,0 +1,23 @@
+class SoyTemplateProcessor < Tilt::Template
+  COMPILER_ROOT = File.expand_path(File.dirname(__FILE__))
+  COMPILER_JAR  = File.join(COMPILER_ROOT, "/../jar/SoyToJsSrcCompiler.jar")
+
+  self.default_mime_type = 'application/javascript'
+
+  def self.engine_initialized?; true; end
+  def initialize_engine; end
+  def prepare; end
+
+  def evaluate(context, locals, &block)
+    context.require_asset 'soyutils'
+
+    # not the prettiest way to do this, but it works, for now...
+    out = file.gsub(/soy$/, 'soyjs')
+    `java -jar #{COMPILER_JAR} --outputPathFormat #{out} #{file}`
+
+    @output = IO.read(out)
+    File.delete(out)
+
+    @output
+  end
+end