-onAdd/onRemove order is determined by system priority

-fixed many bug with onAdd/onRemove
-onAdd/onRemove now works even when system haven't update callback

source/ecs/manager.d

@@ -93,7 +93,16 @@ class EntityManager
         foreach (ref system; systems)
         {
             if (system.m_update is null)
+            {
+                if(system.m_entity_added || system.m_entity_removed)
+                {
+                    foreach (info; &entities_infos.byValue)
+                    {
+                        connectListenerToEntityInfo(*info,system.id);
+                    }
+                }
                 continue;
+            }
 
             bool added = false;
             foreach (i, caller; passes[system.m_pass].system_callers)
@@ -119,6 +128,7 @@ class EntityManager
             foreach (info; &entities_infos.byValue)
             {
                 addSystemCaller(*info, system.id);
+                //info.systems[system.id] = true;
             }
         }
 
@@ -1197,8 +1207,12 @@ class EntityManager
 
             foreach (i, ref system; systems)
             {
+                //if(system.m_entity_added || system.m_entity_removed)info.systems[system.id] = true;
                 if (system.m_update is null)
+                {
+                    if(system.m_entity_added || system.m_entity_removed)connectListenerToEntityInfo(*info,cast(uint)i);
                     continue;
+                }
                 addSystemCaller(*info, cast(uint)i);
             }
 
@@ -1221,18 +1235,53 @@ class EntityManager
             Mallocator.instance.dispose(info.remove_listeners);
             info.remove_listeners = null;
         }
-
+        //allocate local data
         ushort[] tmp_add = (cast(ushort*)alloca(systems.length*ushort.sizeof))[0..systems.length];
         ushort[] tmp_rem = (cast(ushort*)alloca(systems.length*ushort.sizeof))[0..systems.length];
         int add_len = 0;
         int rem_len = 0;
+        //assign listeners to lists
         foreach(i;0..systems.length)
         {
             if(info.systems[i])
             {
                 System* system = &systems[i];
-                if(system.m_entity_added)tmp_add[add_len++] = cast(ushort)i;
-                if(system.m_entity_removed)tmp_rem[rem_len++] = cast(ushort)i;
+                //onAddEntity listener
+                if(system.m_entity_added)
+                {
+                    //find listener position by priority
+                    int j;
+                    for(j=0;j<add_len;j++)
+                    {
+                        if(systems[i].priority > systems[tmp_add[j]].priority)break;
+                    }
+                    add_len++;
+                    //move elements after new listener
+                    for(int k=add_len;k>j;k--)
+                    {
+                        tmp_add[k] = tmp_add[k-1];
+                    }
+                    //assign listener
+                    tmp_add[j] = cast(ushort)i;
+                }
+                //onRemoveEntity listener
+                if(system.m_entity_removed)
+                {
+                    //find listener position by priority
+                    int j;
+                    for(j=0;j<rem_len;j++)
+                    {
+                        if(systems[i].priority > systems[tmp_rem[j]].priority)break;
+                    }
+                    rem_len++;
+                    //move elements after new listener
+                    for(int k=rem_len;k>j;k--)
+                    {
+                        tmp_rem[k] = tmp_rem[k-1];
+                    }
+                    //assign listener
+                    tmp_rem[j] = cast(ushort)i;
+                }
             }
         }
         
@@ -1245,11 +1294,11 @@ class EntityManager
         if(rem_len)
         {
             info.remove_listeners = Mallocator.instance.makeArray!ushort(rem_len);
-            memcpy(info.remove_listeners.ptr,tmp_add.ptr,rem_len*ushort.sizeof);
+            memcpy(info.remove_listeners.ptr,tmp_rem.ptr,rem_len*ushort.sizeof);
         }
     }
 
-    export void addSystemCaller(ref EntityInfo entity, uint system_id) nothrow @nogc
+    export void connectListenerToEntityInfo(ref EntityInfo entity, uint system_id) nothrow @nogc
     {
         System* system = &systems[system_id];
 
@@ -1276,6 +1325,38 @@ class EntityManager
         is_:
         }
 
+        entity.systems[system_id] = true;
+    }
+
+    export void addSystemCaller(ref EntityInfo info, uint system_id) nothrow @nogc
+    {
+        System* system = &systems[system_id];
+
+        if (system.m_excluded_components)
+        {
+            foreach (id; system.m_excluded_components)
+            {
+                foreach (id2; info.components)
+                {
+                    if (id == id2)
+                        return;
+                }
+            }
+        }
+
+        foreach (id; system.m_components)
+        {
+            foreach (i2, id2; info.components)
+            {
+                if (id2 == id)
+                    goto is_;
+            }
+            return;
+        is_:
+        }
+
+        info.systems[system_id] = true;
+
         uint index = 0;
         for (; index < passes[system.m_pass].system_callers.length; index++)
         {
@@ -1285,9 +1366,7 @@ class EntityManager
 
         if (index < passes[system.m_pass].system_callers.length)
         {
-            passes[system.m_pass].system_callers[index].infos.add(&entity);
-
-            entity.systems[system_id] = true;
+            passes[system.m_pass].system_callers[index].infos.add(&info);
         }
             
     }
@@ -1917,7 +1996,7 @@ class EntityManager
 
     private void callRemoveEntityListeners(EntityInfo* info, EntitiesBlock* block, int begin, int end) @nogc nothrow
     {
-        foreach(listener;info.add_listeners)
+        foreach(listener;info.remove_listeners)
         {
             System* system = &systems[listener];
             callRemoveEntityListener(system,info,block,begin,end);