only enough

main.go

@@ -70,9 +70,17 @@ func alertsAfter(ctx context.Context, dur time.Duration, msg string) (chan strin
 	deadline := time.Now().Add(dur)
 	go func() {
 		defer close(ch)
+		var prev string
 		for ctx.Err() == nil && time.Now().Before(deadline) {
 			seconds := int(time.Until(deadline).Seconds())
-			fmt.Printf("\r%v         ", time.Duration(seconds)*time.Second)
+
+			cur := fmt.Sprintf("%v", time.Duration(seconds)*time.Second)
+			if prev != "" {
+				fmt.Printf("\r%s\r", strings.Repeat(" ", len(prev)))
+			}
+			fmt.Printf("%s", cur)
+			prev = cur
+
 			select {
 			case <-ctx.Done():
 			case <-time.After(time.Second):