code: def completion_hints(config, prompt, session, context, current, arguments):
      # type: (CompletionInfo, str, ShellSession, BundleContext, str, List[str]) -> List[str]
      
      if not current:
          # No word yet, so the current position is after the existing ones
          arg_idx = len(arguments)
      else:
          # Find the current word position
          arg_idx = arguments.index(current)
  
      # Find the ID of the next completer
      completers = config.completers
      if arg_idx > len(completers) - 1:
          # Argument is too far to be positional, try
          if config.multiple:
              # Multiple calls allowed for the last completer
              completer_id = completers[-1]
          else:
              # Nothing to return
              return []
      else:
          completer_id = completers[arg_idx]
  
      if completer_id == DUMMY:
          # Dummy completer: do nothing
          return []
  
      # Find the matching service
      svc_ref = context.get_service_reference(
          SVC_COMPLETER, "({}={})".format(PROP_COMPLETER_ID, completer_id)
      )
      if svc_ref is None:
          # Handler not found
          _logger.debug("Unknown shell completer ID: %s", completer_id)
          return []
  
      # Call the completer
      try:
          with use_service(context, svc_ref) as completer:
              matches = completer.complete(
                  config, prompt, session, context, arguments, current
              )
              if not matches:
                  return []
  
              return matches
      except Exception as ex:
          _logger.exception("Error calling completer %s: %s", completer_id, ex)
          return []
docs: Returns the possible completions of the current argument
  
      :param config: Configuration of the current completion
      :param prompt: The shell prompt string
      :param session: Current shell session
      :param context: Context of the shell UI bundle
      :param current: Current argument (to be completed)
      :param arguments: List of all arguments in their current state
      :return: A list of possible completions