docs: def gen_files(path, prefix="_"):
      " Return file generator "
  
      if op.isdir(path):
          for name in listdir(path):
              fpath = op.join(path, name)
              if is_parsed_file(fpath):
                  yield op.abspath(fpath)
  
      elif is_parsed_file(path):
          yield op.abspath(path)