code: func (ui *ui) BeginLinef(pattern string, args ...interface{}) {
  	message := fmt.Sprintf(pattern, args...)
  	_, err := fmt.Fprint(ui.outWriter, message)
  	if err != nil {
  		ui.logger.Error(ui.logTag, "UI.BeginLinef failed (message='%s'): %s", message, err)
  	}
  }
docs: // PrintBeginf starts a text line