sass_template_handler.rb

module ActionView
  class ErSass < ActionView::TemplateHandler
    include ERB::Util

    SASS_ENGINE_OPTS = {
      :load_paths => Compass.configuration.sass_load_paths + ["#{Rails.root}/app/stylesheets"]
    }

    def self.call(template)
      "ActionView::ErSass.new(self).render(template, local_assigns)"
    end

    def initialize(view = nil)
      @view = view
    end

    def render(template, local_assigns = {})
      controller = @view.controller
      controller.headers['Content-Type'] ||= Mime::CSS
      controller.instance_variables.each do |v|
        instance_variable_set v, controller.instance_variable_get(v)
      end
      erbsrc = ::ERB.new("<% __in_erb_template=true %>#{template.source}", nil, '-').src
      erboutput = @view.instance_eval(erbsrc)
      Sass::Engine.new(erboutput, Sass::Plugin.options.merge(SASS_ENGINE_OPTS)).render
    end
  end
end

ActionView::Template.register_template_handler :sass, ActionView::ErSass
ActionView::Template.exempt_from_layout :sass