docs: def _setup_parser(self):
          """Setup a configuration parser.
  
          Contains built in ``--system-config`` || ``-SC`` variable which is used
          to allow a user to set arguments in a configuration file which would
          then be processed from the "default" section of the provided file,
          assuming the file exists.
  
          :return: ``tuple``
          """
          # Set the prefix for environment variables
          ename = self.env_name.upper()
          env_name = '%s_CONFIG' % ename
  
          # Accept a config file
          conf_parser = argparse.ArgumentParser(add_help=False)
          conf_parser.add_argument(
              '--system-config',
              metavar='[FILE]',
              type=str,
              default=os.environ.get(env_name, None),
              help='Path to your Configuration file. This is an optional'
                   ' argument used to specify config. available as: env[%s]'
                   % env_name
          )
          known_args, remaining_argv = conf_parser.parse_known_args()
          conf_file = known_args.system_config
          if conf_file is not None:
              file_name = os.path.basename(conf_file)
              config = parse_ini.ConfigurationSetup(log_name=file_name)
              path_dir = os.path.dirname(conf_file)
              config.load_config(path=path_dir)
              config_args = config.config_args(section='default')
              known_args.__dict__.update(config_args)
  
          parser = argparse.ArgumentParser(
              parents=[conf_parser],
              usage=self.usage,
              description=self.description,
              epilog=self.epilog)
  
          # Setup for the positional Arguments
          if self.detail is not None:
              self.detail = '%s\n' % self.detail
  
          if 'subparsed_args' in self.arguments:
              subparser = parser.add_subparsers(
                  title=self.title,
                  metavar=self.detail
              )
          else:
              subparser = None
  
          return parser, subparser, remaining_argv