From dd491302afa388e86e7ad5b2a4a5af502a28431b Mon Sep 17 00:00:00 2001
From: Mergul <wismerchil@interia.eu>
Date: Wed, 13 May 2020 15:31:26 +0200
Subject: [PATCH] Fixed system reregistration issue and added funtion to
 allocate EntityTEmplate as copy of different teamplte

---
 source/bubel/ecs/manager.d | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/source/bubel/ecs/manager.d b/source/bubel/ecs/manager.d
index 15d1f6e..c6b02a1 100644
--- a/source/bubel/ecs/manager.d
+++ b/source/bubel/ecs/manager.d
@@ -1150,17 +1150,22 @@ export struct EntityManager
         ushort sys_id = systems_map.get(cast(char[]) Sys.stringof, ushort.max);
         if (sys_id < systems.length)
         {
-            system.enable();
+            systems[sys_id].disable();
+            if(systems[sys_id].m_destroy)(cast(void function(void*)) systems[sys_id].m_destroy)(systems[sys_id].m_system_pointer);
 
             if (system.m_create)
                 (cast(void function(void*)) system.m_create)(system.m_system_pointer);
 
+            system.enable();
+
             system.m_id = sys_id;
+            system.m_name = systems[sys_id].m_name;
             systems[sys_id] = system;
         }
         else
         {
             system.m_name = Mallocator.makeArray(cast(char[]) Sys.stringof);
+
             systems_map.add(system.m_name, cast(ushort) systems.length);
 
             system.m_id = cast(ushort)(systems.length);
@@ -1723,6 +1728,20 @@ export struct EntityManager
         return temp;
     }
 
+    /************************************************************************************************************************
+    Allocate EntityTemplate copy.
+    
+    Params:
+    copy_tmpl = template which should be copied
+    */
+    export EntityTemplate* allocateTemplate(EntityTemplate* copy_tmpl)
+    {
+        EntityTemplate* tmpl = Mallocator.make!EntityTemplate;
+        tmpl.info = copy_tmpl.info;
+        tmpl.entity_data = Mallocator.makeArray(copy_tmpl.entity_data);
+        return tmpl;
+    }
+
     /************************************************************************************************************************
     Returns entity type info.
     
@@ -2344,7 +2363,7 @@ export struct EntityManager
     Params:
     template_ = pointer entity template allocated by EntityManager.
     */
-    export void freeTemplate(EntityTemplate* template_)
+    export void freeTemplate(EntityTemplate* template_) @nogc nothrow
     {
         Mallocator.dispose(template_.entity_data);
         Mallocator.dispose(template_);