docs: def line_is_interesting(self, line):
          """Return True, False, or None.
  
          True means always output, False means never output, None means output
          only if there are interesting lines.
  
          """
          if line.startswith('Name'):
              return None
          if line.startswith('--------'):
              return None
          if line.startswith('TOTAL'):
              return None
          if '100%' in line:
              return False
          if line == '\n':
              return None if self._last_line_was_printable else False
          return True