Returns `ExtractMethod` to use on resource at path. Cannot be None.

def get_extract_method(path):
  """Returns `ExtractMethod` to use on resource at path. Cannot be None."""
  info_path = _get_info_path(path)
  info = _read_info(info_path)
  fname = info.get('original_fname', path) if info else path
  return _guess_extract_method(fname)