docs: def get_conf_path(filename=None):
      """Return absolute path for configuration file with specified filename."""
      conf_dir = osp.join(get_home_dir(), '.condamanager')
  
      if not osp.isdir(conf_dir):
          os.mkdir(conf_dir)
  
      if filename is None:
          return conf_dir
      else:
          return osp.join(conf_dir, filename)