new_contents: """
  @note: enable X
  """
  
  from trac.core import Component
  from trac.wiki.macros import WikiMacroBase
  
  
  class FacebookPlugins(Component):
      """
      Support for Facebook plugins.
      """
  
      revision = "$Rev$"
      url = "$URL$"
  
      
  class LikeButton(WikiMacroBase):
      """
      The [http://developers.facebook.com/docs/reference/plugins/like Like button] lets
      users share pages from your site back to their Facebook profile with one click.
      
      Examples:
      {{{
      [[LikeButton]]                                   # current page
      [[LikeButton(http://google.nl)]]                 # google.nl with default layout
      [[LikeButton(http://google.com,button)]]         # google.com with button layout
      [[LikeButton(http://google.com,box)]]            # google.com with box layout
      }}}
      """
  
      revision = "$Rev$"
      url = "$URL$"
  
      def expand_macro(self, formatter, name, args):
          """Description here.
  
          @param name: the actual name of the macro
          @param args: text enclosed in parenthesis at the call of the macro
          """
          options = unicode(args).split(",")
          href = self.url
          layout = 'standard' # options: 'button_count', 'box_count'
          show_faces = 'true'
          width = '450'
          height = '80'
          colorscheme = 'light' # or 'dark'
          action = 'like' # or 'recommend'
          
          if len(options) > 0:
              href = options[0]
          
          if len(options) > 1:
              layout = options[1] + "_count"
  
          iframe_code = '<iframe src="http://www.facebook.com/plugins/like.php?href=%s&layout=%s&show_faces=%s&width=%s&action=%s&colorscheme=%s&height=%s" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:%spx; height:%spx;" allowTransparency="true"></iframe>' % (
                         href, layout, show_faces, width, action, colorscheme, height, width, height)
          
          return iframe_code
  
subject: Add wiki macro for the Like button.