feat: Added ListenerFunc (#9)

README.md

@@ -19,7 +19,10 @@ go get github.com/go-packagist/event/v3
 ```go
 package main
 
-import "github.com/go-packagist/event/v3"
+import (
+	"fmt"
+	"github.com/go-packagist/event/v3"
+)
 
 type Event struct {
 	Stop bool
@@ -66,6 +69,9 @@ func main() {
 
 	d.Listen("event", &Listener1{})
 	d.Listen("event", &Listener2{})
+	d.Listen("event", event.ListenerFunc(func(event event.Event) {
+		fmt.Println(event.Name())
+	}))
 
 	d.Dispatch(e) // echo: listener1:event (because listener1 set Stop to true)
 

example/main.go → _example/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"github.com/go-packagist/event/v3"
 )
 
@@ -49,6 +50,9 @@ func main() {
 
 	d.Listen("event", &Listener1{})
 	d.Listen("event", &Listener2{})
+	d.Listen("event", event.ListenerFunc(func(event event.Event) {
+		fmt.Println(event.Name())
+	}))
 
 	d.Dispatch(e) // echo: listener1:event (because listener1 set Stop to true)
 

dispatcher_test.go

@@ -119,3 +119,13 @@ func TestFlush(t *testing.T) {
 	assert.Equal(t, 0, len(d.GetListeners("test1")))
 	assert.Equal(t, 0, len(d.GetListeners("test2")))
 }
+
+func TestDispatcher_ListenerFunc(t *testing.T) {
+	d := NewDispatcher()
+
+	event1 := newTestEvent("test1")
+
+	d.Listen("test1", ListenerFunc(func(event Event) {
+		assert.Equal(t, event1, event)
+	}))
+}

event.go

@@ -5,6 +5,7 @@ type Event interface {
 	Name() string
 }
 
+// StoppableEvent interface
 type StoppableEvent interface {
 	IsPropagationStopped() bool
 }

listener.go

@@ -4,3 +4,11 @@ package event
 type Listener interface {
 	Handle(event Event)
 }
+
+// ListenerFunc listener function
+type ListenerFunc func(event Event)
+
+// Handle event
+func (f ListenerFunc) Handle(event Event) {
+	f(event)
+}