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

src/script/cpp_api/s_client_common.cpp

@@ -0,0 +1,39 @@
+// Luanti
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+// Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+// Copyright (C) 2025 grorp
+
+#include "s_client_common.h"
+#include "s_internal.h"
+#include "client/client.h"
+
+bool ScriptApiClientCommon::on_formspec_input(const std::string &formname,
+		const StringMap &fields)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.registered_on_formspec_inputs
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_formspec_input");
+	// Call callbacks
+	// param 1
+	lua_pushstring(L, formname.c_str());
+	// param 2
+	lua_newtable(L);
+	StringMap::const_iterator it;
+	for (it = fields.begin(); it != fields.end(); ++it) {
+		const std::string &name = it->first;
+		const std::string &value = it->second;
+		lua_pushstring(L, name.c_str());
+		lua_pushlstring(L, value.c_str(), value.size());
+		lua_settable(L, -3);
+	}
+	try {
+		runCallbacks(2, RUN_CALLBACKS_MODE_OR_SC);
+	} catch (LuaError &e) {
+		getClient()->setFatalError(e);
+		return true;
+	}
+	return readParam<bool>(L, -1);
+}