Added Sass module and 'sass' method for rendering Sass stylesheets.

lib/sinatra.rb

@@ -475,6 +475,66 @@ def render_haml(content, options = {}, &b)
 
   end
 
+  # Generate valid CSS using Sass (part of Haml)
+  #
+  # Sass templates can be in external files with +.sass+ extension or can use Sinatra's
+  # in_file_templates.  In either case, the file can be rendered by passing the name of
+  # the template to the +sass+ method as a symbol.
+  #
+  # === Sass Template Files
+  #
+  # Sass templates can be stored in separate files with a +.sass+ 
+  # extension under the view path.
+  #
+  # Example:
+  #   get '/stylesheet.css' do
+  #     header 'Content-Type' => 'text/css; charset=utf-8'
+  #     sass :stylesheet
+  #   end
+  #
+  # The "views/stylesheet.sass" file might contain the following:
+  #  
+  #  body
+  #    #admin
+  #      :background-color #CCC
+  #    #main
+  #      :background-color #000
+  #  #form
+  #    :border-color #AAA
+  #    :border-width 10px
+  #
+  # And yields the following output:
+  #
+  #   body #admin {
+  #     background-color: #CCC; }
+  #   body #main {
+  #     background-color: #000; }
+  #   
+  #   #form {
+  #     border-color: #AAA;
+  #     border-width: 10px; }
+  #   
+  #
+  # NOTE: Haml must be installed or a LoadError will be raised the first time an
+  # attempt is made to render a Sass template.
+  #
+  # See http://haml.hamptoncatlin.com/docs/rdoc/classes/Sass.html for comprehensive documentation on Sass.
+
+
+  module Sass
+
+    def sass(content)
+      require 'sass'
+      render(:sass, content)
+    end
+
+    private
+
+      def render_sass(content, options = {})
+        ::Sass::Engine.new(content).render
+      end
+  end
+
   # Generating conservative XML content using Builder templates.
   #
   # Builder templates can be inline by passing a block to the builder method, or in
@@ -574,6 +634,7 @@ class EventContext
     include Erb
     include Haml
     include Builder
+    include Sass
 
     attr_accessor :request, :response