func noKillsSince()

in mysql/mysql.go [402:428]

• 18 lines of code
• 4 McCabe index (conditional complexity)

func noKillsSince(days int, now time.Time, endHour int, loc *time.Location) (time.Time, error) {
	if days < 0 {
		return time.Time{}, errors.Errorf("noKillsSince passed illegal input: days=%d", days)
	}

	oneDay := time.Hour * 24

	// Tail-recursive helper function reads clearer than writing a
	// traditional loop
	//
	// It expects a time localized to the zone associated with endHour because
	// workday and year-month-day values depend on the local timezone
	var helper func(N int, tInLoc time.Time) time.Time

	helper = func(N int, tInLoc time.Time) time.Time {
		switch {
		case !cal.IsWorkday(tInLoc):
			return helper(N, tInLoc.Add(-oneDay))
		case N == 0:
			return time.Date(tInLoc.Year(), tInLoc.Month(), tInLoc.Day(), endHour, 0, 0, 0, loc).UTC()
		default:
			return helper(N-1, tInLoc.Add(-oneDay))
		}
	}

	return helper(days, now.In(loc)), nil
}