code: func (h *DefaultPluginHandler) Lookup(filename string) (string, bool) {
  	for _, prefix := range h.ValidPrefixes {
  		path, err := exec.LookPath(fmt.Sprintf("%s-%s", prefix, filename))
  		if err != nil || len(path) == 0 {
  			continue
  		}
  		return path, true
  	}
  
  	return "", false
  }
docs: // Lookup implements PluginHandler