docs: def parse_args(arglist=None):
      """Parse cmd line arguments.
  
      Update :attr:`stagpy.conf` accordingly.
  
      Args:
          arglist (list of str): the list of cmd line arguments. If set to
              None, the arguments are taken from :attr:`sys.argv`.
  
      Returns:
          function: the function implementing the sub command to be executed.
      """
      climan = CLIManager(conf, **SUB_CMDS)
  
      create_complete_files(climan, CONFIG_DIR, 'stagpy', 'stagpy-git',
                            zsh_sourceable=True)
  
      cmd_args, all_subs = climan.parse_args(arglist)
      sub_cmd = cmd_args.loam_sub_name
  
      if sub_cmd is None:
          return cmd_args.func
  
      if sub_cmd != 'config':
          commands.report_parsing_problems(PARSING_OUT)
  
      if conf.common.set:
          set_conf_str(conf, conf.common.set)
  
      if conf.common.config:
          commands.config_pp(all_subs)
  
      load_mplstyle()
  
      try:
          _steps_to_slices()
      except AttributeError:
          pass
      return cmd_args.func