Move SCSS generators and default templates from Rails to the Sass Railtie (d435726312601edb3ba6f97b34f562221f72c1f8).

* Sass gem registers a compressor
* Sass gem registers generators for assets and scaffold
* Create a default stylesheet_engine ("css") for apps that remove the Sass gem

Author: tomhuda

actionpack/lib/sprockets/railtie.rb

@@ -9,15 +9,7 @@ def self.using_coffee?
       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|
@@ -62,8 +54,8 @@ def asset_environment(app)
       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) if app.assets.compress
-      env.css_compressor = expand_css_compressor(assets.css_compressor) if app.assets.compress
+      env.js_compressor = expand_js_compressor(assets.js_compressor) if assets.compress
+      env.css_compressor = expand_css_compressor(assets.css_compressor) if assets.compress
       env
     end
 
@@ -85,15 +77,6 @@ def expand_js_compressor(sym)
 
     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

railties/lib/rails/generators.rb

@@ -57,7 +57,7 @@ module Generators
         :resource_controller => :controller,
         :scaffold_controller => :scaffold_controller,
         :stylesheets => true,
-        :stylesheet_engine => nil,
+        :stylesheet_engine => :css,
         :test_framework => false,
         :template_engine => :erb
       },

railties/lib/rails/generators/css/assets/assets_generator.rb

@@ -0,0 +1,13 @@
+require "rails/generators/named_base"
+
+module Css
+  module Generators
+    class AssetsGenerator < Rails::Generators::NamedBase
+      source_root File.expand_path("../templates", __FILE__)
+
+      def copy_stylesheet
+        copy_file "stylesheet.css", File.join('app/assets/stylesheets', class_path, "#{file_name}.css")
+      end
+    end
+  end
+end

railties/lib/rails/generators/rails/assets/templates/stylesheet.css.scss renamed to railties/lib/rails/generators/css/assets/templates/stylesheet.css

@@ -1,5 +1,4 @@
-/* 
+/*
   Place all the styles related to the matching controller here.
   They will automatically be included in application.css.
-  You can use Sass (SCSS) here: http://sass-lang.com/
 */

railties/lib/rails/generators/css/scaffold/scaffold_generator.rb

@@ -0,0 +1,16 @@
+require "rails/generators/named_base"
+
+module Css
+  module Generators
+    class ScaffoldGenerator < Rails::Generators::NamedBase
+      # In order to allow the Sass generators to pick up the default Rails CSS and
+      # transform it, we leave it in a standard location for the CSS stylesheet
+      # generators to handle. For the simple, default case, just copy it over.
+      def copy_stylesheet
+        dir = Rails::Generators::ScaffoldGenerator.source_root
+        file = File.join(dir, "scaffold.css")
+        create_file "app/assets/stylesheets/scaffold.css", File.read(file)
+      end
+    end
+  end
+end

railties/lib/rails/generators/rails/assets/assets_generator.rb

@@ -13,12 +13,6 @@ def create_javascript_files
           File.join('app/assets/javascripts', class_path, "#{asset_name}.#{javascript_extension}")
       end
 
-      def create_stylesheet_files
-        return unless options.stylesheets?
-        copy_file "stylesheet.#{stylesheet_extension}",
-          File.join('app/assets/stylesheets', class_path, "#{asset_name}.#{stylesheet_extension}")
-      end
-
       protected
 
       def asset_name
@@ -30,9 +24,8 @@ def javascript_extension
           "js.#{options.javascript_engine}" : "js"
       end
 
-      def stylesheet_extension
-        options.stylesheet_engine.present? ?
-          "css.#{options.stylesheet_engine}" : "css"
+      hook_for :stylesheet_engine do |stylesheet_engine|
+        invoke stylesheet_engine, [name] if options[:stylesheets]
       end
     end
   end

railties/lib/rails/generators/rails/scaffold/scaffold_generator.rb

@@ -11,21 +11,12 @@ class ScaffoldGenerator < ResourceGenerator #metagenerator
 
       hook_for :scaffold_controller, :required => true
 
-      def copy_stylesheets_file
-        if behavior == :invoke && options.stylesheets?
-          template "scaffold.#{stylesheet_extension}", "app/assets/stylesheets/scaffold.#{stylesheet_extension}"
-        end
-      end
-
       hook_for :assets do |assets|
         invoke assets, [controller_name]
       end
 
-      private
-
-      def stylesheet_extension
-        options.stylesheet_engine.present? ?
-          "css.#{options.stylesheet_engine}" : "css"
+      hook_for :stylesheet_engine do |stylesheet_engine|
+        invoke stylesheet_engine, [controller_name] if options[:stylesheets] && behavior == :invoke
       end
     end
   end

railties/lib/rails/generators/rails/scaffold/templates/scaffold.css.scss

@@ -9,17 +9,17 @@ class AssetsGeneratorTest < Rails::Generators::TestCase
   def test_assets
     run_generator
     assert_file "app/assets/javascripts/posts.js.coffee"
-    assert_file "app/assets/stylesheets/posts.css.scss"
+    assert_file "app/assets/stylesheets/posts.css"
   end
 
   def test_skipping_assets
     content = run_generator ["posts", "--no-stylesheets", "--no-javascripts"]
     assert_no_file "app/assets/javascripts/posts.js.coffee"
-    assert_no_file "app/assets/stylesheets/posts.css.scss"
+    assert_no_file "app/assets/stylesheets/posts.css"
   end
 
   def test_vanilla_assets
-    run_generator ["posts", "--no-javascript-engine", "--no-stylesheet-engine"]
+    run_generator ["posts", "--no-javascript-engine"]
     assert_file "app/assets/javascripts/posts.js"
     assert_file "app/assets/stylesheets/posts.css"
   end

railties/test/generators/assets_generator_test.rb

@@ -40,7 +40,7 @@ def test_does_not_invoke_helper_if_required
   def test_invokes_assets
     run_generator
     assert_file "app/assets/javascripts/account.js.coffee"
-    assert_file "app/assets/stylesheets/account.css.scss"
+    assert_file "app/assets/stylesheets/account.css"
   end
 
   def test_invokes_default_test_framework