add custom message to timer

main.go

@@ -12,6 +12,7 @@ import (
 )
 
 var notified = false
+var alertMessage string
 
 var originalStart = time.Now()
 
@@ -28,6 +29,7 @@ func main() {
 	flag.BoolVar(&invert, "stopwatch", false, "Use as a stopwatch")
 	flag.StringVar(&duration, "duration", "30m", "How long the timer should be")
 	flag.StringVar(&offset, "offset", "0m", "How much time the initial time should skip")
+	flag.StringVar(&alertMessage, "msg", "Timer up", "Message to display on timer expiration")
 	flag.StringVar(&interval, "interval", "500ms", "Interval duration")
 	flag.BoolVar(&eta, "eta", false, "Whether to display the ending time")
 	flag.Parse()
@@ -179,7 +181,7 @@ func printTime(pRemains *time.Duration, target time.Duration, delim *rune, rever
 func alertTime(pRemains *time.Duration, target time.Duration, reverse, repeat bool) {
 	if !notified {
 		notified = true
-		_, err := mack.Alert(fmt.Sprintf("Timer for %s done", target.String()))
+		_, err := mack.Alert(fmt.Sprintf("%s\nTimer for %s done", alertMessage, target.String()))
 		if err != nil {
 			panic(err)
 		}