code: def emit_path_arg(keywordstr, arg, fd, indent, max_line_len, line_len, eol):
      
  
      quote = '"'
  
      arg = escape_str(arg)
  
      if not(need_new_line(max_line_len, line_len, arg)):
          fd.write(" " + quote + arg + quote)
          return False
  
      ## FIXME: we should split the path on '/' and '[]' into multiple lines
      ## and then print each line
  
      num_chars = max_line_len - line_len
      if num_chars <= 0:
          # really small max_line_len; we give up
          fd.write(" " + quote + arg + quote)
          return False
  
      while num_chars > 2 and arg[num_chars - 1:num_chars].isalnum():
          num_chars -= 1
      fd.write(" " + quote + arg[:num_chars] + quote)
      arg = arg[num_chars:]
      keyword_cont = ((len(keywordstr) - 1) * ' ') + '+'
      while arg != '':
          line_len = len(
              "%s%s %s%s%s%s" % (indent, keyword_cont, quote, arg, quote, eol))
          num_chars = len(arg) - (line_len - max_line_len)
          while num_chars > 2 and arg[num_chars - 1:num_chars].isalnum():
              num_chars -= 1
          fd.write('\n' + indent + keyword_cont + " " +
                   quote + arg[:num_chars] + quote)
          arg = arg[num_chars:]
docs: Heuristically pretty print a path argument