docs: def cutoff(s, length=120):
      """Cuts a given string if it is longer than a given length."""
      if length < 5:
          raise ValueError('length must be >= 5')
      if len(s) <= length:
          return s
      else:
          i = (length - 2) / 2
          j = (length - 3) / 2
          return s[:i] + '...' + s[-j:]