fix some memleaks

At this point, i don't get any memleaks caused by kiwmi. There may still
be some hidden ones though.

include/input/cursor.h

@@ -43,6 +43,7 @@ struct kiwmi_cursor {
     struct {
         struct wl_signal button_down;
         struct wl_signal button_up;
+        struct wl_signal destroy;
         struct wl_signal motion;
         struct wl_signal scroll;
     } events;

include/server.h

@@ -22,6 +22,10 @@ struct kiwmi_server {
     struct kiwmi_lua *lua;
     struct kiwmi_desktop desktop;
     struct kiwmi_input input;
+
+    struct {
+        struct wl_signal destroy;
+    } events;
 };
 
 bool server_init(struct kiwmi_server *server, char *config_path);

kiwmi/input/cursor.c

@@ -254,6 +254,7 @@ cursor_create(
 
     wl_signal_init(&cursor->events.button_down);
     wl_signal_init(&cursor->events.button_up);
+    wl_signal_init(&cursor->events.destroy);
     wl_signal_init(&cursor->events.motion);
     wl_signal_init(&cursor->events.scroll);
 
@@ -263,6 +264,8 @@ cursor_create(
 void
 cursor_destroy(struct kiwmi_cursor *cursor)
 {
+    wl_signal_emit(&cursor->events.destroy, cursor);
+
     wlr_cursor_destroy(cursor->cursor);
     wlr_xcursor_manager_destroy(cursor->xcursor_manager);
 

kiwmi/luak/kiwmi_cursor.c

@@ -309,7 +309,8 @@ luaK_kiwmi_cursor_new(lua_State *L)
     struct kiwmi_lua *lua       = lua_touserdata(L, 1);
     struct kiwmi_cursor *cursor = lua_touserdata(L, 2);
 
-    struct kiwmi_object *obj = luaK_get_kiwmi_object(lua, cursor, NULL);
+    struct kiwmi_object *obj =
+        luaK_get_kiwmi_object(lua, cursor, &cursor->events.destroy);
 
     struct kiwmi_object **cursor_ud = lua_newuserdata(L, sizeof(*cursor_ud));
     luaL_getmetatable(L, "kiwmi_cursor");

kiwmi/luak/kiwmi_server.c

@@ -574,7 +574,8 @@ luaK_kiwmi_server_new(lua_State *L)
     struct kiwmi_lua *lua       = lua_touserdata(L, 1);
     struct kiwmi_server *server = lua_touserdata(L, 2);
 
-    struct kiwmi_object *obj = luaK_get_kiwmi_object(lua, server, NULL);
+    struct kiwmi_object *obj =
+        luaK_get_kiwmi_object(lua, server, &server->events.destroy);
 
     struct kiwmi_object **server_ud = lua_newuserdata(L, sizeof(*server_ud));
     luaL_getmetatable(L, "kiwmi_server");

kiwmi/server.c

@@ -46,6 +46,8 @@ server_init(struct kiwmi_server *server, char *config_path)
     struct wlr_renderer *renderer = wlr_backend_get_renderer(server->backend);
     wlr_renderer_init_wl_display(renderer, server->wl_display);
 
+    wl_signal_init(&server->events.destroy);
+
     if (!desktop_init(&server->desktop, renderer)) {
         wlr_log(WLR_ERROR, "Failed to initialize desktop");
         wl_display_destroy(server->wl_display);
@@ -132,6 +134,8 @@ server_fini(struct kiwmi_server *server)
 {
     wlr_log(WLR_DEBUG, "Shutting down Wayland server");
 
+    wl_signal_emit(&server->events.destroy, server);
+
     wl_display_destroy_clients(server->wl_display);
 
     desktop_fini(&server->desktop);