Begin garbage collector

src/text_editor/lua_api.cpp

@@ -291,7 +291,6 @@ Color GetColor(String name, Color default_color) {
     return result;
 }
 
-BufferID      LuaBufferID       = {-1};
 Int           LuaBufferChangeID = 0;
 void          ReloadStyle();
 extern String BaseLuaConfig;

src/text_editor/management.cpp

@@ -7,19 +7,14 @@ Array<ViewID>   Views   = {};
 Array<WindowID> Windows = {};
 
 WindowID NullWindowID;
-BufferID NullBufferID;
+BufferID NullBufferID; // +buffer
 ViewID   NullViewID;
 
-WindowID DebugWindowID;
+WindowID DebugWindowID; // +debug
 BufferID DebugBufferID;
+BufferID LuaBufferID = {-1};
 
-// @note:
-// Remember that WindowCommand works on window handed it down from HandleEvent
-// just because we don't have NextActiveWindow doesn't mean that we work on new
-// window all of a sudden in that function call!
-WindowID        ActiveWindow;
-Array<WindowID> WindowSwitchHistory; // @todo: probably better as a circular buffer
-Int             CaretChangeID;
+WindowID ActiveWindow;
 
 WindowID ScrollbarSelected = {-1};
 WindowID DocumentSelected  = {-1};
@@ -340,3 +335,49 @@ View *WindowOpenBufferView(Window *new_parent_window, String name) {
     new_parent_window->active_view = result->id;
     return result;
 }
+
+bool ViewIsReferenced(ViewID view) {
+    For(Windows) {
+        Window *window = it.o;
+        if (window->active_view == view) return true;
+        if (window->active_goto_list == view) return true;
+    }
+    return false;
+}
+
+bool BufferIsReferenced(BufferID buffer_id) {
+    if (buffer_id == NullBufferID) return true;
+    if (buffer_id == DebugBufferID) return true;
+    if (buffer_id == LuaBufferID) return true;
+    For(Views) {
+        View *view = it.o;
+        if (view->active_buffer == buffer_id) return true;
+    }
+    return false;
+}
+
+void GarbageCollect() {
+    IterRemove(Views) {
+        IterRemovePrepare(Views);
+        View *view = it.o;
+        if (!ViewIsReferenced(view->id)) {
+            Dealloc(&view->carets);
+            // @todo: add view to free list
+            remove_item = true;
+        }
+    }
+
+    IterRemove(Buffers) {
+        IterRemovePrepare(Buffers);
+        Buffer *buffer = it.o;
+        if (!BufferIsReferenced(buffer->id)) {
+            Dealloc(&buffer->line_starts);
+            Dealloc(&buffer->undo_stack);
+            Dealloc(&buffer->redo_stack);
+            Dealloc(buffer->line_starts.allocator, &buffer->data);
+            // @todo: add buffer to free list
+            remove_item = true;
+            ReportConsolef("collected = %.*s", FmtString(buffer->name));
+        }
+    }
+}

src/text_editor/text_editor.cpp

@@ -156,11 +156,6 @@ Event TranslateSDLEvent(SDL_Event *input_event) {
     return event;
 }
 
-void HandleEvent(Event event) {
-    GlobalCommand(event);
-    For(Windows) if (it.o->is_title_bar) ReplaceTitleBarData(it.o);
-}
-
 void Update(Event event) {
     WindowSize = {(float)event.xwindow, (float)event.ywindow};
     LayoutWindows();
@@ -175,11 +170,12 @@ void Update(Event event) {
         view->update_scroll             = true;
     }
 
-    HandleEvent(event);
-
+    GlobalCommand(event);
+    For(Windows) if (it.o->is_title_bar) ReplaceTitleBarData(it.o);
     UpdateProcesses();
     UpdateLua();
     UpdateDebugBuffer();
+    GarbageCollect();
 
     For(IterateInReverse(&order)) {
         Window *window = Windows[it].o;