def __FormatLine(filepath, line_index, max_line_number_size, lines, highlight = False):
  """ Format a single line."""
  if highlight:
    return "%s:%s: > %s"%(filepath, str(line_index+1).rjust(max_line_number_size), lines[line_index])
  else:
    return "%s:%s:   %s"%(filepath, str(line_index+1).rjust(max_line_number_size), lines[line_index])