docs: def _prepare_quote(quote, author, max_len=78):
      """This function processes a quote and returns a string that is ready
  to be used in the fancy prompt.
  
      """
      quote = quote.split(' ')
      max_len -= 6
      lines = []
      cur_line = []
  
      def _len(line):
          return sum(len(elt) for elt in line) + len(line) - 1
      while quote:
          if not cur_line or (_len(cur_line) + len(quote[0]) - 1 <= max_len):
              cur_line.append(quote.pop(0))
              continue
          lines.append('   | %s' % ' '.join(cur_line))
          cur_line = []
      if cur_line:
          lines.append('   | %s' % ' '.join(cur_line))
          cur_line = []
      lines.append('   | %s-- %s' % (" " * (max_len - len(author) - 5), author))
      return lines