code: func (tpl *Template) RegisterPartialFile(filePath string, name string) error {
  	b, err := ioutil.ReadFile(filePath)
  	if err != nil {
  		return err
  	}
  
  	tpl.RegisterPartial(name, string(b))
  
  	return nil
  }
docs: // RegisterPartialFile reads given file and registers its content as a partial with given name.