Adds current class to link if on the current page

link_to_with_current.rb

  def link_to_with_current(*args)
    html_class = args[2][:class] if args[2]
    path = args[1].is_a?(Array) ? polymorphic_path(args[1]) : args[1]
    if current_page?(path)
      if html_class.nil?
        html_class = "current"
      else
        html_class << " current"
      end
      if args[2]
        args[2]['class'] = html_class
      else
        args << {:class => html_class}
      end
    end
    link_to(*args)
  end