SCSS Template Handler

template_handler.rb

require 'sass/plugin'

module Sass
  module Rails
    class TemplateHandler
      class_attribute :default_format
      self.default_format = Mime::CSS

      def initialize 
      end

      def call(template)
        erb = ActionView::Template.registered_template_handler(:erb).call(template)

        %{
          environment = orig_environment = ::Rails.application.assets
          environment = environment.instance_variable_get("@environment") if environment.is_a?(Sprockets::Index)
          context = environment.context_class.new(environment, '', Pathname.new(''))

          ::Rails.application.assets = environment

          options = Compass::Compiler.new(*Compass.configuration.to_compiler_arguments({
            :syntax => :scss,
            :custom => {
              :resolver => ::Sass::Rails::Resolver.new(context)
            }
          })).options
          
          ::Rails.application.assets = orig_environment

          Sass::Engine.new((begin;#{erb};end), options).render
        }
      end
    end
  end
end

ActiveSupport.on_load(:action_view) do
  ActionView::Template.register_template_handler :scss, Sass::Rails::TemplateHandler.new
end