Active link style helper

gistfile1.rb

  #returns 'active' if current page == uri
  #depth specifies how much of the URL is compared, either [:controller, :action, :complete]
  def class_for_link(uri, depth=:action)
    path_hash = ActionController::Routing::Routes.recognize_path(uri,  { :method => :get })
    
    match = case depth
    when :controller
      path_hash[:controller] == controller.controller_name
    when :complete
      uri == request.path
    else
      [path_hash[:controller], path_hash[:action]] == [controller.controller_name, controller.action_name]
    end

    match ? 'active' : ''
  end