def _pre_init(self):
        """Initialize mailing lists directory path"""

        if not self.parsed_args.mboxes_path:
            base_path = os.path.expanduser('~/.perceval/mailinglists/')
            dirpath = os.path.join(base_path, GROUPSIO_URL, 'g', self.parsed_args.group_name)
        else:
            dirpath = self.parsed_args.mboxes_path

        setattr(self.parsed_args, 'dirpath', dirpath)
Initialize mailing lists directory path