new playAnimationUntil that stops animation when notify channel receives message

toolkit.go

@@ -64,7 +64,6 @@ func (tk *ToolKit) PlayAnimation(a Animation) error {
 			return err
 		}
 	}
-
 	if err == io.EOF {
 		return nil
 	}
@@ -72,6 +71,35 @@ func (tk *ToolKit) PlayAnimation(a Animation) error {
 	return err
 }
 
+func (tk *ToolKit) PlayAnimationUntil(a Animation, notify <-chan bool) error {
+
+	var err error
+	var i image.Image
+	var n <-chan time.Time
+	var outerError error
+	for outerError == nil {
+		select {
+		case <-notify:
+			return nil
+		default:
+			i, n, err = a.Next()
+			if err != nil {
+				outerError = err
+				break
+			}
+			if err := tk.PlayImageUntil(i, n); err != nil {
+				return err
+			}
+		}
+	}
+	if outerError == io.EOF {
+		return nil
+	}
+
+	return err
+
+}
+
 // PlayImageUntil draws the given image until is notified to stop
 func (tk *ToolKit) PlayImageUntil(i image.Image, notify <-chan time.Time) error {
 	defer func() {