remind: Add support for reminders the next day and mixed duration formats

mods/remind.go

@@ -147,16 +147,45 @@ func isSscanfValid(n int, err error) bool {
 	return err == nil
 }
 
-func parseDuration(date string) (time.Time, error) {
+func scanMixedDelay(str string) (bool, time.Time, error) {
+	remaining := str
 	now := time.Now()
 	num := 0
 	sep := ' '
+	for len(remaining) > 1 {
+		scanned, err := fmt.Sscanf(remaining, "%d%c", &num, &sep)
+		if err != nil {
+			return false, now, err
+		}
+		dur := time.Duration(num)
+		switch unicode.ToLower(sep) {
+		case 's':
+			dur *= time.Second
+		case 'm':
+			dur *= time.Minute
+		case 'h':
+			dur *= time.Hour
+		case 'd':
+			dur *= time.Hour * 24
+		default:
+			return true, now, fmt.Errorf("La durata ha una unità che non conosco, usa una di queste: s (secondi) m (minuti) h (ore) d (giorni)")
+		}
+		now = now.Add(dur)
+		remaining = remaining[scanned:]
+	}
+	return true, now, nil
+}
+
+func parseDuration(date string) (time.Time, error) {
+	now := time.Now()
 	hour := now.Hour()
 	min := now.Minute()
 	sec := now.Second()
 	day := now.Day()
 	month := now.Month()
 	year := now.Year()
+	dayunspecified := false
+	isDurationFmt, duration, err := scanMixedDelay(date)
 	switch {
 	case isSscanfValid(fmt.Sscanf(date, "%d/%d/%d-%d:%d:%d", &day, &month, &year, &hour, &min, &sec)):
 	case isSscanfValid(fmt.Sscanf(date, "%d/%d/%d-%d:%d", &day, &month, &year, &hour, &min)):
@@ -169,33 +198,27 @@ func parseDuration(date string) (time.Time, error) {
 		day = now.Day()
 		month = now.Month()
 		year = now.Year()
+		dayunspecified = true
 	case isSscanfValid(fmt.Sscanf(date, "%d:%d", &hour, &min)):
 		day = now.Day()
 		month = now.Month()
 		year = now.Year()
 		sec = 0
-	case isSscanfValid(fmt.Sscanf(date, "%d%c", &num, &sep)):
-		dur := time.Duration(num)
-		switch unicode.ToLower(sep) {
-		case 's':
-			dur *= time.Second
-		case 'm':
-			dur *= time.Minute
-		case 'h':
-			dur *= time.Hour
-		case 'd':
-			dur *= time.Hour * 24
-		default:
-			return now, fmt.Errorf("La durata ha una unità che non conosco, usa una di queste: s (secondi) m (minuti) h (ore) d (giorni)")
-		}
-		return now.Add(dur), nil
+		dayunspecified = true
+	case isDurationFmt:
+		return duration, err
 	default:
 		return now, fmt.Errorf("Non capisco quando dovrei ricordartelo!")
 	}
 	loc, _ := time.LoadLocation("Local")
 	targetDate := time.Date(year, month, day, hour, min, sec, 0, loc)
 	if targetDate.Before(now) {
-		return now, fmt.Errorf("Non posso ricordarti cose nel passato!")
+		// If day was not specified assume tomorrow
+		if dayunspecified {
+			targetDate = targetDate.Add(time.Hour * 24)
+		} else {
+			return now, fmt.Errorf("Non posso ricordarti cose nel passato!")
+		}
 	}
 	if targetDate.After(now.Add(ReminderMaxDuration)) {
 		return now, fmt.Errorf("Non credo riuscirei a ricordarmi qualcosa per così tanto")