docs: def extract_irc_colours(msg):
      """Extract the IRC colours from the start of the string.
  
      Extracts the colours from the start, and returns the colour code in our
      format, and then the rest of the message.
      """
      # first colour
      fore, msg = _extract_irc_colour_code(msg)
  
      if not fore:
          return '[]', msg
      if not len(msg) or msg[0] != ',':
          return '[{}]'.format(_ctos(fore)), msg
  
      msg = msg[1:]  # strip comma
  
      # second colour
      back, msg = _extract_irc_colour_code(msg)
  
      if back:
          return '[{},{}]'.format(_ctos(fore), _ctos(back)), msg
      else:
          return '[{}]'.format(_ctos(fore)), ',' + msg