[CSM] Add enable_client_modding param (default: false)

builtin/settingtypes.txt

@@ -264,6 +264,9 @@ show_entity_selectionbox (Show entity selection boxes) bool true
 #    when connecting to the server.
 enable_remote_media_server (Connect to external media server) bool true
 
+#    Enable Lua modding support on client.
+enable_client_modding (Client modding) bool false
+
 #    URL to the server list displayed in the Multiplayer Tab.
 serverlist_url (Serverlist URL) string servers.minetest.net
 

minetest.conf.example

@@ -282,6 +282,11 @@
 #    type: bool
 # enable_remote_media_server = true
 
+#    Enable Lua modding support on client.
+#    This support is experimental and API can change.
+#    type: bool
+enable_client_modding (Client modding) bool false
+
 #    URL to the server list displayed in the Multiplayer Tab.
 #    type: string
 # serverlist_url = servers.minetest.net

src/client.cpp

@@ -248,7 +248,8 @@ Client::Client(
 	m_recommended_send_interval(0.1),
 	m_removed_sounds_check_timer(0),
 	m_state(LC_Created),
-	m_localdb(NULL)
+	m_localdb(NULL),
+	m_script(NULL)
 {
 	// Add local player
 	m_env.setLocalPlayer(new LocalPlayer(this, playername));
@@ -262,6 +263,7 @@ Client::Client(
 		g_settings->getBool("enable_bumpmapping") ||
 		g_settings->getBool("enable_parallax_occlusion"));
 
+	m_modding_enabled = g_settings->getBool("enable_client_modding");
 	m_script = new ClientScripting(this);
 	m_env.setScript(m_script);
 }
@@ -270,6 +272,11 @@ void Client::initMods()
 {
 	m_script->loadMod(getBuiltinLuaPath() + DIR_DELIM "init.lua", BUILTIN_MOD_NAME);
 
+	// If modding is not enabled, don't load mods, just builtin
+	if (!m_modding_enabled) {
+		return;
+	}
+
 	ClientModConfiguration modconf(getClientModsLuaPath());
 	std::vector<ModSpec> mods = modconf.getMods();
 	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
@@ -327,6 +334,7 @@ const ModSpec* Client::getModSpec(const std::string &modname) const
 
 void Client::Stop()
 {
+	// Don't disable this part when modding is disabled, it's used in builtin
 	m_script->on_shutdown();
 	//request all client managed threads to stop
 	m_mesh_update_thread.stop();

src/client.h

@@ -572,6 +572,7 @@ public:
 	}
 
 	ClientScripting *getScript() { return m_script; }
+	const bool moddingEnabled() const { return m_modding_enabled; }
 
 	inline void pushToEventQueue(const ClientEvent &event)
 	{
@@ -722,6 +723,7 @@ private:
 	bool m_cache_use_tangent_vertices;
 
 	ClientScripting *m_script;
+	bool m_modding_enabled;
 
 	DISABLE_CLASS_COPY(Client);
 };

src/clientenvironment.cpp

@@ -245,7 +245,9 @@ void ClientEnvironment::step(float dtime)
 		}
 	}
 
-	m_script->environment_step(dtime);
+	if (m_client->moddingEnabled()) {
+		m_script->environment_step(dtime);
+	}
 
 	/*
 		A quick draft of lava damage

src/defaultsettings.cpp

@@ -54,6 +54,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("curl_file_download_timeout", "300000");
 	settings->setDefault("curl_verify_cert", "true");
 	settings->setDefault("enable_remote_media_server", "true");
+	settings->setDefault("enable_client_modding", "false");
 
 	// Keymap
 	settings->setDefault("remote_port", "30000");

src/game.cpp

@@ -179,6 +179,8 @@ struct LocalFormspecHandler : public TextDest {
 				return;
 			}
 		}
+
+		// Don't disable this part when modding is disabled, it's used in builtin
 		m_client->getScript()->on_formspec_input(m_formname, fields);
 	}
 
@@ -3185,9 +3187,10 @@ void Game::processClientEvents(CameraOrientation *cam, float *damage_flash)
 
 	for ( ; event.type != CE_NONE; event = client->getClientEvent()) {
 
-		if (event.type == CE_PLAYER_DAMAGE &&
+		if (event.type == CE_PLAYER_DAMAGE && client->getHP() != 0) {
-				client->getHP() != 0) {
+			if (client->moddingEnabled()) {
-			client->getScript()->on_damage_taken(event.player_damage.amount);
+				client->getScript()->on_damage_taken(event.player_damage.amount);
+			}
 
 			*damage_flash += 95.0 + 3.2 * event.player_damage.amount;
 			*damage_flash = MYMIN(*damage_flash, 127.0);
@@ -3202,6 +3205,7 @@ void Game::processClientEvents(CameraOrientation *cam, float *damage_flash)
 			cam->camera_yaw = event.player_force_move.yaw;
 			cam->camera_pitch = event.player_force_move.pitch;
 		} else if (event.type == CE_DEATHSCREEN) {
+			// This should be enabled for death formspec in builtin
 			client->getScript()->on_death();
 
 			/* Handle visualization */
@@ -3902,7 +3906,7 @@ void Game::handleDigging(GameRunData *runData,
 
 	if (!runData->digging) {
 		infostream << "Started digging" << std::endl;
-		if (client->getScript()->on_punchnode(nodepos, n))
+		if (client->moddingEnabled() && client->getScript()->on_punchnode(nodepos, n))
 			return;
 		client->interact(0, pointed);
 		runData->digging = true;
@@ -3971,7 +3975,7 @@ void Game::handleDigging(GameRunData *runData,
 	} else {
 		infostream << "Digging completed" << std::endl;
 		client->setCrack(-1, v3s16(0, 0, 0));
-	
+
 		runData->dig_time = 0;
 		runData->digging = false;
 
@@ -3993,9 +3997,10 @@ void Game::handleDigging(GameRunData *runData,
 		bool is_valid_position;
 		MapNode wasnode = map.getNodeNoEx(nodepos, &is_valid_position);
 		if (is_valid_position) {
-			bool block = client->getScript()->on_dignode(nodepos, wasnode);
+			if (client->moddingEnabled()) {
-			if (block) {
+				if (client->getScript()->on_dignode(nodepos, wasnode)) {
-				return;
+					return;
+				}
 			}
 			client->removeNode(nodepos);
 		}

src/network/clientpackethandler.cpp

@@ -413,7 +413,7 @@ void Client::handleCommand_ChatMessage(NetworkPacket* pkt)
 	}
 
 	// If chat message not consummed by client lua API
-	if (!m_script->on_receiving_message(wide_to_utf8(message))) {
+	if (!moddingEnabled() || !m_script->on_receiving_message(wide_to_utf8(message))) {
 		pushToChatQueue(message);
 	}
 }
@@ -526,7 +526,9 @@ void Client::handleCommand_HP(NetworkPacket* pkt)
 
 	player->hp = hp;
 
-	m_script->on_hp_modification(hp);
+	if (moddingEnabled()) {
+		m_script->on_hp_modification(hp);
+	}
 
 	if (hp < oldhp) {
 		// Add to ClientEvent queue

src/script/cpp_api/s_client.cpp

@@ -155,8 +155,7 @@ bool ScriptApiClient::on_dignode(v3s16 p, MapNode node)
 
 	// Call functions
 	runCallbacks(2, RUN_CALLBACKS_MODE_OR);
-	bool blocked = lua_toboolean(L, -1);
+	return lua_toboolean(L, -1);
-	return blocked;
 }
 
 bool ScriptApiClient::on_punchnode(v3s16 p, MapNode node)