Allow defining player's inventory form in Lua

doc/lua_api.txt

@@ -759,6 +759,10 @@ minetest.register_on_respawnplayer(func(ObjectRef))
 ^ Called when player is to be respawned
 ^ Called _before_ repositioning of player occurs
 ^ return true in func to disable regular player placement
+minetest.register_on_joinplayer(func(ObjectRef))
+^ Called when a player joins the game
+minetest.register_on_leaveplayer(func(ObjectRef))
+^ Called when a player leaves the game
 minetest.register_on_chat_message(func(name, message))
 
 Other registration functions:
@@ -993,8 +997,8 @@ LuaEntitySAO-only: (no-op for other objects)
 - settexturemod(mod)
 - setsprite(p={x=0,y=0}, num_frames=1, framelength=0.2,
 -           select_horiz_by_yawpitch=false)
-- ^ Select sprite from spritesheet with optional animation and DM-style
--   texture selection based on yaw relative to camera
+  ^ Select sprite from spritesheet with optional animation and DM-style
+    texture selection based on yaw relative to camera
 - get_entity_name() (DEPRECATED: Will be removed in a future version)
 - get_luaentity()
 Player-only: (no-op for other objects)
@@ -1003,6 +1007,10 @@ Player-only: (no-op for other objects)
 - get_look_dir(): get camera direction as a unit vector
 - get_look_pitch(): pitch in radians
 - get_look_yaw(): yaw in radians (wraps around pretty randomly as of now)
+- set_inventory_formspec(formspec)
+  ^ Redefine player's inventory form
+  ^ Should usually be called in on_joinplayer
+- get_inventory_formspec() -> formspec string
 
 InvRef: Reference to an inventory
 methods:

games/minimal/mods/experimental/init.lua

@@ -504,6 +504,16 @@ minetest.register_craft({
 	}
 })
 
+--[[minetest.register_on_joinplayer(function(player)
+	minetest.after(3, function()
+		player:set_inventory_formspec("invsize[8,7.5;]"..
+			"image[1,0.6;1,2;player.png]"..
+			"list[current_player;main;0,3.5;8,4;]"..
+			"list[current_player;craft;3,0;3,3;]"..
+			"list[current_player;craftpreview;7,1;1,1;]")
+	end)
+end)]]
+
 minetest.log("experimental modname="..dump(minetest.get_current_modname()))
 minetest.log("experimental modpath="..dump(minetest.get_modpath("experimental")))
 minetest.log("experimental worldpath="..dump(minetest.get_worldpath()))

src/client.cpp

@@ -1688,6 +1688,16 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 		}
 		infostream<<std::endl;
 	}
+	else if(command == TOCLIENT_INVENTORY_FORMSPEC)
+	{
+		std::string datastring((char*)&data[2], datasize-2);
+		std::istringstream is(datastring, std::ios_base::binary);
+
+		// Store formspec in LocalPlayer
+		Player *player = m_env.getLocalPlayer();
+		assert(player != NULL);
+		player->inventory_formspec = deSerializeLongString(is);
+	}
 	else
 	{
 		infostream<<"Client: Ignoring unknown command "

src/clientserver.h

@@ -58,6 +58,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	PROTOCOL_VERSION 11:
 		TileDef in ContentFeatures
 		Nodebox drawtype
+		Added after a release: TOCLIENT_INVENTORY_FORMSPEC
 */
 
 #define PROTOCOL_VERSION 11
@@ -308,6 +309,13 @@ enum ToClientCommand
 			u16 len
 			u8[len] privilege
 	*/
+
+	TOCLIENT_INVENTORY_FORMSPEC = 0x42,
+	/*
+		u16 command
+		u32 len
+		u8[len] formspec
+	*/
 };
 
 enum ToServerCommand

src/game.cpp

@@ -144,6 +144,22 @@ public:
 	v3s16 m_p;
 };
 
+class PlayerInventoryFormSource: public IFormSource
+{
+public:
+	PlayerInventoryFormSource(Client *client):
+		m_client(client)
+	{
+	}
+	std::string getForm()
+	{
+		LocalPlayer* player = m_client->getEnv().getLocalPlayer();
+		return player->inventory_formspec;
+	}
+
+	Client *m_client;
+};
+
 /*
 	Hotbar draw routine
 */
@@ -1463,14 +1479,10 @@ void the_game(
 			InventoryLocation inventoryloc;
 			inventoryloc.setCurrentPlayer();
 
-			menu->setFormSpec(
-				"invsize[8,7.5;]"
-				//"image[1,0.6;1,2;player.png]"
-				"list[current_player;main;0,3.5;8,4;]"
-				"list[current_player;craft;3,0;3,3;]"
-				"list[current_player;craftpreview;7,1;1,1;]"
-				, inventoryloc);
-
+			PlayerInventoryFormSource *src = new PlayerInventoryFormSource(&client);
+			assert(src);
+			menu->setFormSpec(src->getForm(), inventoryloc);
+			menu->setFormSource(new PlayerInventoryFormSource(&client));
 			menu->drop();
 		}
 		else if(input->wasKeyDown(EscapeKey))

src/player.cpp

@@ -48,6 +48,13 @@ Player::Player(IGameDef *gamedef):
 	inventory.addList("craft", 9);
 	inventory.addList("craftpreview", 1);
 	inventory.addList("craftresult", 1);
+
+	// Can be redefined via Lua
+	inventory_formspec =  "invsize[8,7.5;]"
+		//"image[1,0.6;1,2;player.png]"
+		"list[current_player;main;0,3.5;8,4;]"
+		"list[current_player;craft;3,0;3,3;]"
+		"list[current_player;craftpreview;7,1;1,1;]";
 }
 
 Player::~Player()

src/player.h

@@ -157,6 +157,8 @@ public:
 
 	u16 peer_id;
 
+	std::string inventory_formspec;
+
 protected:
 	IGameDef *m_gamedef;
 

src/scriptapi.cpp

@@ -2864,6 +2864,32 @@ private:
 		return 1;
 	}
 
+	// set_inventory_formspec(self, formspec)
+	static int l_set_inventory_formspec(lua_State *L)
+	{
+		ObjectRef *ref = checkobject(L, 1);
+		Player *player = getplayer(ref);
+		if(player == NULL) return 0;
+		std::string formspec = luaL_checkstring(L, 2);
+
+		player->inventory_formspec = formspec;
+		get_server(L)->reportInventoryFormspecModified(player->getName());
+		lua_pushboolean(L, true);
+		return 1;
+	}
+
+	// get_inventory_formspec(self) -> formspec
+	static int l_get_inventory_formspec(lua_State *L)
+	{
+		ObjectRef *ref = checkobject(L, 1);
+		Player *player = getplayer(ref);
+		if(player == NULL) return 0;
+
+		std::string formspec = player->inventory_formspec;
+		lua_pushlstring(L, formspec.c_str(), formspec.size());
+		return 1;
+	}
+
 public:
 	ObjectRef(ServerActiveObject *object):
 		m_object(object)
@@ -2960,6 +2986,8 @@ const luaL_reg ObjectRef::methods[] = {
 	method(ObjectRef, get_look_dir),
 	method(ObjectRef, get_look_pitch),
 	method(ObjectRef, get_look_yaw),
+	method(ObjectRef, set_inventory_formspec),
+	method(ObjectRef, get_inventory_formspec),
 	{0,0}
 };
 

src/server.cpp

@@ -2243,6 +2243,9 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 		// Send privileges
 		SendPlayerPrivileges(peer_id);
 		
+		// Send inventory formspec
+		SendPlayerInventoryFormspec(peer_id);
+
 		// Send inventory
 		UpdateCrafting(peer_id);
 		SendInventory(peer_id);
@@ -3573,6 +3576,9 @@ void Server::SendPlayerPrivileges(u16 peer_id)
 {
 	Player *player = m_env->getPlayer(peer_id);
 	assert(player);
+	if(player->peer_id == PEER_ID_INEXISTENT)
+		return;
+
 	std::set<std::string> privs;
 	scriptapi_get_auth(m_lua, player->getName(), NULL, &privs);
 	
@@ -3591,6 +3597,24 @@ void Server::SendPlayerPrivileges(u16 peer_id)
 	m_con.Send(peer_id, 0, data, true);
 }
 
+void Server::SendPlayerInventoryFormspec(u16 peer_id)
+{
+	Player *player = m_env->getPlayer(peer_id);
+	assert(player);
+	if(player->peer_id == PEER_ID_INEXISTENT)
+		return;
+
+	std::ostringstream os(std::ios_base::binary);
+	writeU16(os, TOCLIENT_INVENTORY_FORMSPEC);
+	os<<serializeLongString(player->inventory_formspec);
+
+	// Make data buffer
+	std::string s = os.str();
+	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
+	// Send as reliable
+	m_con.Send(peer_id, 0, data, true);
+}
+
 s32 Server::playSound(const SimpleSoundSpec &spec,
 		const ServerSoundParams &params)
 {
@@ -4357,6 +4381,14 @@ void Server::reportPrivsModified(const std::string &name)
 	}
 }
 
+void Server::reportInventoryFormspecModified(const std::string &name)
+{
+	Player *player = m_env->getPlayer(name.c_str());
+	if(!player)
+		return;
+	SendPlayerInventoryFormspec(player->peer_id);
+}
+
 // Saves g_settings to configpath given at initialization
 void Server::saveConfig()
 {

src/server.h

@@ -505,6 +505,7 @@ public:
 	std::set<std::string> getPlayerEffectivePrivs(const std::string &name);
 	bool checkPriv(const std::string &name, const std::string &priv);
 	void reportPrivsModified(const std::string &name=""); // ""=all
+	void reportInventoryFormspecModified(const std::string &name);
 
 	// Saves g_settings to configpath given at initialization
 	void saveConfig();
@@ -602,6 +603,7 @@ private:
 	void SendPlayerHP(u16 peer_id);
 	void SendMovePlayer(u16 peer_id);
 	void SendPlayerPrivileges(u16 peer_id);
+	void SendPlayerInventoryFormspec(u16 peer_id);
 	/*
 		Send a node removal/addition event to all clients except ignore_id.
 		Additionally, if far_players!=NULL, players further away than