code: func GetAPIKeyPath() (string, error) {
  	dir, err := osutil.PerkeepConfigDir()
  	if err != nil {
  		return "", fmt.Errorf("could not get config dir: %v", err)
  	}
  	return filepath.Join(dir, apiKeyName), nil
  }
docs: // GetAPIKeyPath returns the file path to the Google geocoding API key.