new_contents: import pkg_resources
  
  
  def open_directory(engine, kwargs):
      entry_point = None
  
      for candidate_entry_point in pkg_resources.iter_entry_points(
          'jacquard.directory_engines',
          name=engine,
      ):
          entry_point = candidate_entry_point
  
      if entry_point is None:
          raise RuntimeError("Cannot find directory engine '%s'" % engine)
  
      cls = entry_point.load()
      return cls(**kwargs)
  
subject: Add open directory utility function