code: def magic_file(filename):
      
      head, foot = _file_details(filename)
      if not head:
          raise ValueError("Input was empty")
      try:
          info = _identify_all(head, foot, ext_from_filename(filename))
      except PureError:
          info = []
      info.sort(key=lambda x: x.confidence, reverse=True)
      return info
docs: Returns tuple of (num_of_matches, array_of_matches)
      arranged highest confidence match first.
  
      :param filename: path to file
      :return: list of possible matches, highest confidence first