new_contents: """!help [<command>] prints help on all commands if no command given, or a specific command"""
  
  import re
  
  def on_message(msg, server):
      text = msg.get("text", "")
      match = re.findall(r"!help( .*)?", text)
      if not match: return
  
      helptopic = match[0].strip()
      if helptopic:
          return server["hooks"]["help"].get(helptopic, "No help found for %s" % helptopic)
      else:
          return "\n".join(val for _, val in server["hooks"]["help"].iteritems())
  
subject: add help plugin