eventd.go
func HandleOnly(h Handler, names ...string) Handler {
	return HandlerFunc(func(e Event) {
		for _, name := range names {
			if e.Name() == name {
				h.Handle(e)
				break
			}
		}
	})
}
func HandleOnly(h Handler, names ...string) Handler {
	return HandlerFunc(func(e Event) {
		for _, name := range names {
			if e.Name() == name {
				h.Handle(e)
				break
			}
		}
	})
}
// HandleOnly specific type of event.