notify

type Icon interface{}

type Notifier interface {
	// Close closes the Notifier.
	Close() error

	// Register registers the named event to the Notifier. The keys and values
	// of the opts are dependent on each implementation.
	//
	// Notifier may use the icon for notifications.
	Register(event string, icon Icon, opts map[string]interface{}) error

	// Notify notifies the named event by the specified title and body.
	Notify(event, title, body string) error

	// Sys returns the implementation of the Notifier.
	Sys() interface{}
}