docs: def _get_line_type(line):
      ''' Decide the line type in function of its contents '''
      stripped = line.strip()
      if not stripped:
          return 'empty'
      remainder = re.sub(r"\s+", " ", re.sub(CHORD_RE, "", stripped))
      if len(remainder) * 2 < len(re.sub(r"\s+", " ", stripped)):
          return 'chord'
      return 'lyric'