In-game settings menu using separate Lua environment (#15614)

src/script/scripting_pause_menu.cpp

@@ -0,0 +1,68 @@
+// Luanti
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// Copyright (C) 2025 grorp
+
+#include "scripting_pause_menu.h"
+#include "client/client.h"
+#include "cpp_api/s_internal.h"
+#include "filesys.h"
+#include "lua_api/l_client_common.h"
+#include "lua_api/l_menu_common.h"
+#include "lua_api/l_pause_menu.h"
+#include "lua_api/l_settings.h"
+#include "lua_api/l_util.h"
+#include "porting.h"
+
+PauseMenuScripting::PauseMenuScripting(Client *client):
+		ScriptApiBase(ScriptingType::PauseMenu)
+{
+	setGameDef(client);
+
+	SCRIPTAPI_PRECHECKHEADER
+
+	initializeSecurity();
+
+	lua_getglobal(L, "core");
+	int top = lua_gettop(L);
+
+	// Initialize our lua_api modules
+	initializeModApi(L, top);
+	lua_pop(L, 1);
+
+	// Push builtin initialization type
+	lua_pushstring(L, "pause_menu");
+	lua_setglobal(L, "INIT");
+
+	infostream << "SCRIPTAPI: Initialized pause menu modules" << std::endl;
+}
+
+void PauseMenuScripting::initializeModApi(lua_State *L, int top)
+{
+	// Register reference classes (userdata)
+	LuaSettings::Register(L);
+
+	// Initialize mod API modules
+	ModApiPauseMenu::Initialize(L, top);
+	ModApiMenuCommon::Initialize(L, top);
+	ModApiClientCommon::Initialize(L, top);
+	ModApiUtil::Initialize(L, top);
+}
+
+void PauseMenuScripting::loadBuiltin()
+{
+	loadScript(porting::path_share + DIR_DELIM "builtin" DIR_DELIM "init.lua");
+	checkSetByBuiltin();
+}
+
+bool PauseMenuScripting::checkPathInternal(const std::string &abs_path, bool write_required,
+		bool *write_allowed)
+{
+	// NOTE: The pause menu env is on the same level of trust as the mainmenu env.
+	// However, since it doesn't need anything else at the moment, there's no
+	// reason to give it access to anything else.
+
+	if (write_required)
+		return false;
+	std::string path_share = fs::AbsolutePath(porting::path_share);
+	return !path_share.empty() && fs::PathStartsWith(abs_path, path_share + DIR_DELIM "builtin");
+}