code: func (m *Meta) loadPluginPath() ([]string, error) {
  	js, err := ioutil.ReadFile(filepath.Join(m.DataDir(), PluginPathFile))
  	if os.IsNotExist(err) {
  		return nil, nil
  	}
  
  	if err != nil {
  		return nil, err
  	}
  
  	var pluginPath []string
  	if err := json.Unmarshal(js, &pluginPath); err != nil {
  		return nil, err
  	}
  
  	return pluginPath, nil
  }
docs: // Load the user-defined plugin search path into Meta.pluginPath if the file
  // exists.