fix kn trigger list command to show correct v1/service sink output

Author: Abirdcfly

pkg/kn/commands/flags/sink.go

@@ -149,7 +149,7 @@ func parseSink(sink string) (string, string, string) {
 // SinkToString prepares a sink for list output
 func SinkToString(sink duckv1.Destination) string {
 	if sink.Ref != nil {
-		if sink.Ref.Kind == "Service" {
+		if sink.Ref.Kind == "Service" && sink.Ref.APIVersion == "serving.knative.dev/v1" {
 			return fmt.Sprintf("ksvc:%s", sink.Ref.Name)
 		} else {
 			return fmt.Sprintf("%s:%s", strings.ToLower(sink.Ref.Kind), sink.Ref.Name)

pkg/kn/commands/flags/sink_test.go

@@ -194,6 +194,13 @@ func TestSinkToString(t *testing.T) {
 			Name:       "default"}}
 	expected = "broker:default"
 	assert.Equal(t, expected, SinkToString(sink))
+	sink = duckv1.Destination{
+		Ref: &duckv1.KReference{Kind: "Service",
+			APIVersion: "v1",
+			Namespace:  "my-namespace",
+			Name:       "mysvc"}}
+	expected = "service:mysvc"
+	assert.Equal(t, expected, SinkToString(sink))
 
 	uri := "http://target.example.com"
 	targetExampleCom, err := apis.ParseURL(uri)