i18n.go

@@ -71,17 +71,17 @@ func N(format string, value any) string {
 	return T("i18n.numeric."+format, value)
 }
 
-// AddHandler appends a handler to the default service's handler chain.
-func AddHandler(h KeyHandler) {
+// AddHandler appends one or more handlers to the default service's handler chain.
+func AddHandler(handlers ...KeyHandler) {
 	if svc := Default(); svc != nil {
-		svc.AddHandler(h)
+		svc.AddHandler(handlers...)
 	}
 }
 
-// PrependHandler inserts a handler at the start of the default service's handler chain.
-func PrependHandler(h KeyHandler) {
+// PrependHandler inserts one or more handlers at the start of the default service's handler chain.
+func PrependHandler(handlers ...KeyHandler) {
 	if svc := Default(); svc != nil {
-		svc.PrependHandler(h)
+		svc.PrependHandler(handlers...)
 	}
 }
 

i18n_test.go

@@ -159,6 +159,19 @@ func TestAddHandler_Good(t *testing.T) {
 	assert.Equal(t, initialCount+1, len(svc.Handlers()))
 }
 
+func TestAddHandler_Good_Variadic(t *testing.T) {
+	svc, err := New(WithHandlers())
+	require.NoError(t, err)
+	_ = Init()
+	SetDefault(svc)
+
+	AddHandler(LabelHandler{}, ProgressHandler{})
+	handlers := svc.Handlers()
+	assert.Equal(t, 2, len(handlers))
+	assert.IsType(t, LabelHandler{}, handlers[0])
+	assert.IsType(t, ProgressHandler{}, handlers[1])
+}
+
 func TestPrependHandler_Good(t *testing.T) {
 	svc, err := New(WithHandlers()) // start with no handlers
 	require.NoError(t, err)
@@ -174,6 +187,19 @@ func TestPrependHandler_Good(t *testing.T) {
 	assert.Equal(t, 2, len(handlers))
 }
 
+func TestPrependHandler_Good_Variadic(t *testing.T) {
+	svc, err := New(WithHandlers())
+	require.NoError(t, err)
+	_ = Init()
+	SetDefault(svc)
+
+	PrependHandler(LabelHandler{}, ProgressHandler{})
+	handlers := svc.Handlers()
+	assert.Equal(t, 2, len(handlers))
+	assert.IsType(t, LabelHandler{}, handlers[0])
+	assert.IsType(t, ProgressHandler{}, handlers[1])
+}
+
 // --- executeIntentTemplate ---
 
 func TestExecuteIntentTemplate_Good(t *testing.T) {

service.go

@@ -262,16 +262,19 @@ func (s *Service) PluralCategory(n int) PluralCategory {
 	return GetPluralCategory(s.currentLang, n)
 }
 
-func (s *Service) AddHandler(h KeyHandler) {
+func (s *Service) AddHandler(handlers ...KeyHandler) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	s.handlers = append(s.handlers, h)
+	s.handlers = append(s.handlers, handlers...)
 }
 
-func (s *Service) PrependHandler(h KeyHandler) {
+func (s *Service) PrependHandler(handlers ...KeyHandler) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	s.handlers = append([]KeyHandler{h}, s.handlers...)
+	if len(handlers) == 0 {
+		return
+	}
+	s.handlers = append(append([]KeyHandler(nil), handlers...), s.handlers...)
 }
 
 func (s *Service) ClearHandlers() {