CSM: Don't create the client script environment if CSM is disabled (#7874)

Use the CSM death formspec when CSM is enabled and use the engine death formspec when CSM is disabled.
Move the CSM death formspec code to a dedicated file.

builtin/client/death_formspec.lua

@@ -0,0 +1,16 @@
+-- CSM death formspec. Only used when clientside modding is enabled, otherwise
+-- handled by the engine.
+
+core.register_on_death(function()
+	core.display_chat_message("You died.")
+	local formspec = "size[11,5.5]bgcolor[#320000b4;true]" ..
+		"label[4.85,1.35;" .. fgettext("You died") ..
+		"]button_exit[4,3;3,0.5;btn_respawn;".. fgettext("Respawn") .."]"
+	core.show_formspec("bultin:death", formspec)
+end)
+
+core.register_on_formspec_input(function(formname, fields)
+	if formname == "bultin:death" then
+		core.send_respawn()
+	end
+end)

builtin/client/init.lua

@@ -8,16 +8,4 @@ dofile(commonpath .. "after.lua")
 dofile(commonpath .. "chatcommands.lua")
 dofile(clientpath .. "chatcommands.lua")
 dofile(commonpath .. "vector.lua")
-
-core.register_on_death(function()
-	core.display_chat_message("You died.")
-	local formspec = "size[11,5.5]bgcolor[#320000b4;true]" ..
-	"label[4.85,1.35;" .. fgettext("You died.") .. "]button_exit[4,3;3,0.5;btn_respawn;".. fgettext("Respawn") .."]"
-	core.show_formspec("bultin:death", formspec)
-end)
-
-core.register_on_formspec_input(function(formname, fields)
-	if formname == "bultin:death" then
-		core.send_respawn()
-	end
-end)
+dofile(clientpath .. "death_formspec.lua")

src/client.cpp

@@ -110,36 +110,37 @@ Client::Client(
 	m_cache_save_interval = g_settings->getU16("server_map_save_interval");
 
 	m_modding_enabled = g_settings->getBool("enable_client_modding");
+	// Only create the client script environment if client modding is enabled
+	if (m_modding_enabled) {
 		m_script = new ClientScripting(this);
 		m_env.setScript(m_script);
 		m_script->setEnv(&m_env);
 	}
-
-void Client::loadBuiltin()
-{
-	// Load builtin
-	scanModIntoMemory(BUILTIN_MOD_NAME, getBuiltinLuaPath());
-
-	m_script->loadModFromMemory(BUILTIN_MOD_NAME);
 }
 
 void Client::loadMods()
 {
-	// Don't permit to load mods twice
+	// Don't load mods twice
 	if (m_mods_loaded) {
 		return;
 	}
 
-	// If modding is not enabled or CSM restrictions disable it
-	// don't load CSM mods, only builtin
+	// If client modding is not enabled, don't load client-provided CSM mods or
+	// builtin.
 	if (!m_modding_enabled) {
 		warningstream << "Client side mods are disabled by configuration." << std::endl;
 		return;
 	}
 
+	// Load builtin
+	scanModIntoMemory(BUILTIN_MOD_NAME, getBuiltinLuaPath());
+	m_script->loadModFromMemory(BUILTIN_MOD_NAME);
+
+	// If the server has disabled client-provided CSM mod loading, don't load
+	// client-provided CSM mods. Builtin is loaded so needs verfying.
 	if (checkCSMRestrictionFlag(CSMRestrictionFlags::CSM_RF_LOAD_CLIENT_MODS)) {
 		warningstream << "Client side mods are disabled by server." << std::endl;
-		// If mods loading is disabled and builtin integrity is wrong, disconnect user.
+		// If builtin integrity is wrong, disconnect user
 		if (!checkBuiltinIntegrity()) {
 			// @TODO disconnect user
 		}
@@ -227,7 +228,7 @@ const ModSpec* Client::getModSpec(const std::string &modname) const
 void Client::Stop()
 {
 	m_shutdown = true;
-	// Don't disable this part when modding is disabled, it's used in builtin
+	if (m_modding_enabled)
 		m_script->on_shutdown();
 	//request all client managed threads to stop
 	m_mesh_update_thread.stop();
@@ -237,6 +238,7 @@ void Client::Stop()
 		m_localdb->endSave();
 	}
 
+	if (m_modding_enabled)
 		delete m_script;
 }
 
@@ -1491,10 +1493,9 @@ void Client::typeChatMessage(const std::wstring &message)
 	if (message.empty())
 		return;
 
-	// If message was ate by script API, don't send it to server
-	if (m_script->on_sending_message(wide_to_utf8(message))) {
+	// If message was consumed by script API, don't send it to server
+	if (m_modding_enabled && m_script->on_sending_message(wide_to_utf8(message)))
 		return;
-	}
 
 	// Send to others
 	sendChatMessage(message);

src/client.h

@@ -141,7 +141,6 @@ public:
 	DISABLE_CLASS_COPY(Client);
 
 	// Load local mods into memory
-	void loadBuiltin();
 	void scanModSubfolder(const std::string &mod_name, const std::string &mod_path,
 				std::string mod_subpath);
 	inline void scanModIntoMemory(const std::string &mod_name, const std::string &mod_path)
@@ -400,6 +399,7 @@ public:
 
 	ClientScripting *getScript() { return m_script; }
 	const bool moddingEnabled() const { return m_modding_enabled; }
+	const bool modsLoaded() const { return m_mods_loaded; }
 
 	void pushToEventQueue(ClientEvent *event);
 

src/clientenvironment.cpp

@@ -233,14 +233,14 @@ void ClientEnvironment::step(float dtime)
 			u8 damage = (u8)MYMIN(damage_f + 0.5, 255);
 			if (damage != 0) {
 				damageLocalPlayer(damage, true);
-				m_client->getEventManager()->put(new SimpleTriggerEvent(MtEvent::PLAYER_FALLING_DAMAGE));
+				m_client->getEventManager()->put(
+					new SimpleTriggerEvent(MtEvent::PLAYER_FALLING_DAMAGE));
 			}
 		}
 	}
 
-	if (m_client->moddingEnabled()) {
+	if (m_client->modsLoaded())
 		m_script->environment_step(dtime);
-	}
 
 	// Update lighting on local player (used for wield item)
 	u32 day_night_ratio = getDayNightRatio();

src/game.cpp

@@ -177,8 +177,13 @@ struct LocalFormspecHandler : public TextDest
 			}
 		}
 
-		// Don't disable this part when modding is disabled, it's used in builtin
-		if (m_client && m_client->getScript())
+		if (m_formname == "MT_DEATH_SCREEN") {
+			assert(m_client != 0);
+			m_client->sendRespawn();
+			return;
+		}
+
+		if (m_client && m_client->moddingEnabled())
 			m_client->getScript()->on_formspec_input(m_formname, fields);
 	}
 
@@ -775,6 +780,7 @@ private:
 		bool disable_camera_update = false;
 	};
 
+	void showDeathFormspec();
 	void showPauseMenu();
 
 	// ClientEvent handlers
@@ -1496,8 +1502,6 @@ bool Game::connectToServer(const std::string &playername,
 
 		fps_control.last_time = RenderingEngine::get_timer_time();
 
-		client->loadBuiltin();
-
 		while (RenderingEngine::run()) {
 
 			limitFps(&fps_control, &dtime);
@@ -1882,7 +1886,10 @@ void Game::processKeyInput()
 	} else if (wasKeyDown(KeyType::CMD)) {
 		openConsole(0.2, L"/");
 	} else if (wasKeyDown(KeyType::CMD_LOCAL)) {
+		if (client->moddingEnabled())
 			openConsole(0.2, L".");
+		else
+			m_game_ui->showStatusText(wgettext("CSM is disabled"));
 	} else if (wasKeyDown(KeyType::CONSOLE)) {
 		openConsole(core::clamp(g_settings->getFloat("console_height"), 0.1f, 1.0f));
 	} else if (wasKeyDown(KeyType::FREEMOVE)) {
@@ -2532,12 +2539,15 @@ void Game::handleClientEvent_PlayerForceMove(ClientEvent *event, CameraOrientati
 
 void Game::handleClientEvent_Deathscreen(ClientEvent *event, CameraOrientation *cam)
 {
-	// This should be enabled for death formspec in builtin
+	// If CSM enabled, deathscreen is handled by CSM code in
+	// builtin/client/init.lua
+	if (client->moddingEnabled())
 		client->getScript()->on_death();
-
-	LocalPlayer *player = client->getEnv().getLocalPlayer();
+	else
+		showDeathFormspec();
 
 	/* Handle visualization */
+	LocalPlayer *player = client->getEnv().getLocalPlayer();
 	runData.damage_flash = 0;
 	player->hurt_tilt_timer = 0;
 	player->hurt_tilt_strength = 0;
@@ -4006,6 +4016,27 @@ void Game::extendedResourceCleanup()
 		       << " (note: irrlicht doesn't support removing renderers)" << std::endl;
 }
 
+void Game::showDeathFormspec()
+{
+	static std::string formspec =
+		std::string(FORMSPEC_VERSION_STRING) +
+		SIZE_TAG
+		"bgcolor[#320000b4;true]"
+		"label[4.85,1.35;" + gettext("You died") + "]"
+		"button_exit[4,3;3,0.5;btn_respawn;" + gettext("Respawn") + "]"
+		;
+
+	/* Create menu */
+	/* Note: FormspecFormSource and LocalFormspecHandler  *
+	 * are deleted by guiFormSpecMenu                     */
+	FormspecFormSource *fs_src = new FormspecFormSource(formspec);
+	LocalFormspecHandler *txt_dst = new LocalFormspecHandler("MT_DEATH_SCREEN", client);
+
+	GUIFormSpecMenu::create(current_formspec, client, &input->joystick, fs_src,
+		txt_dst, client->getFormspecPrepend());
+	current_formspec->setFocus("btn_respawn");
+}
+
 #define GET_KEY_NAME(KEY) gettext(getKeySetting(#KEY).name())
 void Game::showPauseMenu()
 {

src/network/clientpackethandler.cpp

@@ -384,12 +384,12 @@ void Client::handleCommand_ChatMessage(NetworkPacket *pkt)
 	chatMessage->type = (ChatMessageType) message_type;
 
 	// @TODO send this to CSM using ChatMessage object
-	if (!moddingEnabled() || !m_script->on_receiving_message(
+	if (moddingEnabled() && m_script->on_receiving_message(
 			wide_to_utf8(chatMessage->message))) {
-		pushToChatQueue(chatMessage);
-	} else {
-		// Message was consumed by CSM and should not handled by client, destroying
+		// Message was consumed by CSM and should not be handled by client
 		delete chatMessage;
+	} else {
+		pushToChatQueue(chatMessage);
 	}
 }