remove level_ member of game_lua_kernel

the intention is to be able to remove the level cfg.

src/game_state.cpp

@@ -186,7 +186,7 @@ void game_state::init(const int ticks, play_controller & pc)
 
 	pathfind_manager_.reset(new pathfind::manager(level_));
 
-	lua_kernel_.reset(new game_lua_kernel(level_, NULL, *this, pc, *reports_));
+	lua_kernel_.reset(new game_lua_kernel(NULL, *this, pc, *reports_));
 
 	game_events_resources_ = boost::make_shared<game_events::t_context>(lua_kernel_.get(), this, static_cast<game_display*>(NULL), &gamedata_, &board_.units_, &no_op, boost::bind(&play_controller::current_side, &pc));
 

src/play_controller.cpp

@@ -278,7 +278,8 @@ void play_controller::init(CVideo& video){
 	plugins_context_->set_callback("quit", throw_end_level(), false);
 }
 
-void play_controller::init_managers(){
+void play_controller::init_managers()
+{
 	LOG_NG << "initializing managers... " << (SDL_GetTicks() - ticks_) << std::endl;
 	prefs_disp_manager_.reset(new preferences::display_manager(gui_.get()));
 	tooltips_manager_.reset(new tooltips::manager(gui_->video()));
@@ -292,7 +293,7 @@ void play_controller::fire_preload()
 {
 	// Run initialization scripts, even if loading from a snapshot.
 	gamestate_.gamedata_.set_phase(game_data::PRELOAD);
-	gamestate_.lua_kernel_->initialize();
+	gamestate_.lua_kernel_->initialize(level_);
 	gamestate_.gamedata_.get_variable("turn_number") = int(turn());
 	pump().fire("preload");
 }

src/replay_controller.cpp

@@ -329,7 +329,7 @@ void replay_controller::reset_replay()
 	resources::game_events=NULL;
 	gamestate_.lua_kernel_.reset();
 	resources::lua_kernel=NULL;
-	gamestate_.lua_kernel_.reset(new game_lua_kernel(level_, &gui_->video(), gamestate_, *this, *gamestate_.reports_));
+	gamestate_.lua_kernel_.reset(new game_lua_kernel(&gui_->video(), gamestate_, *this, *gamestate_.reports_));
 	gamestate_.lua_kernel_->set_game_display(gui_.get());
 	resources::lua_kernel=gamestate_.lua_kernel_.get();
 	gamestate_.game_events_resources_->lua_kernel = resources::lua_kernel;

src/scripting/game_lua_kernel.cpp

@@ -4037,13 +4037,13 @@ int dispatch2(lua_State *L) {
 }
 
 
-game_lua_kernel::game_lua_kernel(const config &cfg, CVideo * video, game_state & gs, play_controller & pc, reports & reports_object)
+game_lua_kernel::game_lua_kernel(CVideo * video, game_state & gs, play_controller & pc, reports & reports_object)
 	: lua_kernel_base(video)
 	, game_display_(NULL)
 	, game_state_(gs)
 	, play_controller_(pc)
 	, reports_(reports_object)
-	, level_(cfg)
+	, level_lua_()
 	, queued_events_()
 {
 	static game_events::queued_event default_queued_event("_from_lua", map_location(), map_location(), config());
@@ -4324,10 +4324,11 @@ game_lua_kernel::game_lua_kernel(const config &cfg, CVideo * video, game_state &
 	lua_settop(L, 0);
 }
 
-void game_lua_kernel::initialize()
+void game_lua_kernel::initialize(const config& level)
 {
 	lua_State *L = mState;
-
+	assert(level_lua_.empty());
+	level_lua_.append_children(level, "lua");
 	// Create the sides table.
 	// note:
 	// This table is redundant to the return value of wesnoth.get_sides({}).
@@ -4374,11 +4375,11 @@ void game_lua_kernel::initialize()
 	BOOST_FOREACH(const config &cfg, game_lua_kernel::preload_scripts) {
 		run(cfg["code"].str().c_str());
 	}
-	BOOST_FOREACH(const config &cfg, level_.child_range("lua")) {
+	BOOST_FOREACH(const config &cfg, level_lua_.child_range("lua")) {
 		run(cfg["code"].str().c_str());
 	}
 
-	load_game();
+	load_game(level);
 }
 
 void game_lua_kernel::set_game_display(game_display * gd) {
@@ -4411,7 +4412,7 @@ static bool is_handled_file_tag(const std::string &s)
  * Executes the game_events.on_load function and passes to it all the
  * scenario tags not yet handled.
  */
-void game_lua_kernel::load_game()
+void game_lua_kernel::load_game(const config& level)
 {
 	lua_State *L = mState;
 
@@ -4420,7 +4421,7 @@ void game_lua_kernel::load_game()
 
 	lua_newtable(L);
 	int k = 1;
-	BOOST_FOREACH(const config::any_child &v, level_.all_children_range())
+	BOOST_FOREACH(const config::any_child &v, level.all_children_range())
 	{
 		if (is_handled_file_tag(v.key)) continue;
 		lua_createtable(L, 2, 0);
@@ -4440,9 +4441,7 @@ void game_lua_kernel::load_game()
  */
 void game_lua_kernel::save_game(config &cfg)
 {
-	BOOST_FOREACH(const config &v, level_.child_range("lua")) {
-		cfg.add_child("lua", v);
-	}
+	cfg.append_children(cfg, "lua");
 
 	lua_State *L = mState;
 

src/scripting/game_lua_kernel.hpp

@@ -59,7 +59,7 @@ class game_lua_kernel : public lua_kernel_base
 	game_data & gamedata();
 	tod_manager & tod_man();
 
-	const config &level_;
+	config level_lua_;
 
 	std::stack<game_events::queued_event const * > queued_events_;
 
@@ -162,15 +162,15 @@ class game_lua_kernel : public lua_kernel_base
 	std::vector<int> get_sides_vector(const vconfig& cfg);
 
 public:
-	game_lua_kernel(const config &, CVideo *, game_state &, play_controller &, reports &);
+	game_lua_kernel(CVideo *, game_state &, play_controller &, reports &);
 
 	void set_game_display(game_display * gd);
 
 	virtual std::string my_name() { return "Game Lua Kernel"; }
 
-	void initialize();
-	void save_game(config &);
-	void load_game();
+	void initialize(const config& level);
+	void save_game(config & level);
+	void load_game(const config& level);
 	bool run_event(game_events::queued_event const &);
 	void set_wml_action(std::string const &, game_events::wml_action::handler);
 	bool run_wml_action(std::string const &, vconfig const &,