docs: def find_config(fname='.rdo.conf', start=None):
      """Go up until you find an rdo config.
      """
      start = start or os.getcwd()
      config_file = os.path.join(start, fname)
      if os.path.isfile(config_file):
          return config_file
  
      parent, _ = os.path.split(start)
      if parent == start:
          raise Exception('Config file not found')
  
      return find_config(fname, parent)