busy.go

func isItBusy(min string) (bool, error) {
	...
	// max -> min.Add(1 * time.Hour)
	max, err := maxTime(min)
        // ...
	srv, err := calendar.New(client)
	// ...
	freebusyRequest := calendar.FreeBusyRequest{
		TimeMin: min,
		TimeMax: max,
		Items:   []*calendar.FreeBusyRequestItem{&cal},
	}
	// ...
	freebusyRequestResponse, err := freebusyRequestCall.Do()
	// ...
	if len(freebusyRequestResponse.Calendars[name].Busy) == 0 {
		return false, nil
	}
	return true, nil
}