updating kanban on

* task creation
* task update
* task deletion

frontend/src/routes/project/Kanban.svelte

@@ -103,20 +103,40 @@
         }
     }
 
-    function handleUpdateEvent(evt){
+    function handleCreateEvent(evt){
+        handleEvent(evt,'create');
+    }
+
+    function handleEvent(evt,method){
         let json = JSON.parse(evt.data);
         if (json.task && json.user){
+            // drop from kanban
             for (let uid in tasks){
                 if (!uid) continue;
                 for (let state in tasks[uid]) delete tasks[uid][state][json.task.id];
             }
-            processTask(json.task);
+
+            // (re) add to kanban
+            if (method != 'delete') processTask(json.task);
+
+            // show notification
             if (json.user.id != user.id) {
-                info = t("user_updated_entity",{user:json.user.name,entity:json.task.name});
+                let term = "user_updated_entity";
+                if (method == 'create') term = "user_created_entity";
+                if (method == 'delete') term = "user_deleted_entity";
+                info = t(term,{user:json.user.name,entity:json.task.name});
                 setTimeout(() => { info = null; },2500);
             }
         }
+    }
 
+	function handleDeleteEvent(evt){
+		console.log('delete task');
+        handleEvent(evt,'delete');
+    }
+
+    function handleUpdateEvent(evt){
+        handleEvent(evt,'update');
     }
 
     function hover(ev,user_id,state){
@@ -135,7 +155,7 @@
 
     async function load(){
         try {
-			eventSource = eventStream(handleUpdateEvent);
+			eventSource = eventStream(handleCreateEvent,handleUpdateEvent,handleDeleteEvent);
             await loadProject();
             loadTasks({project_id:+id,parent_task_id:0});
         } catch (ignored) {}

frontend/src/urls.svelte.js

@@ -15,9 +15,11 @@ export function drop(url){
     });
 }
 
-export function eventStream(updateHandler){
+export function eventStream(createHandler,updateHandler,deleteHandler){
 	const es = new EventSource(api('bus'), {withCredentials: true});
+	if (createHandler) es.addEventListener('CREATE', createHandler);
 	if (updateHandler) es.addEventListener('UPDATE', updateHandler);
+	if (deleteHandler) es.addEventListener('DELETE', deleteHandler);
 	return es;
 }