Add chat message callback and send functions

data/builtin.lua

@@ -147,3 +147,24 @@ minetest.register_node("ignore", {
 	air_equivalent = true,
 })
 
+--
+-- Chat message processing
+--
+
+minetest.registered_on_chat_messages = {}
+
+minetest.on_chat_message = function(name, message)
+	for i,func in ipairs(minetest.registered_on_chat_messages) do
+		ate = func(name, message)
+		if ate then
+			return true
+		end
+	end
+	return false
+end
+
+minetest.register_on_chat_message = function(func)
+	table.insert(minetest.registered_on_chat_messages, func)
+end
+
+-- END

data/mods/default/init.lua

@@ -19,8 +19,11 @@
 -- minetest.register_on_newplayer(func(ObjectRef))
 -- minetest.register_on_respawnplayer(func(ObjectRef))
 -- ^ return true in func to disable regular player placement
+-- minetest.register_on_chat_message(func(name, message))
 -- minetest.setting_get(name)
 -- minetest.setting_getbool(name)
+-- minetest.chat_send_all(text)
+-- minetest.chat_send_player(name, text)
 --
 -- Global objects:
 -- minetest.env - environment reference
@@ -1371,6 +1374,21 @@ end)
 print("setting max_users = " .. dump(minetest.setting_get("max_users")))
 print("setting asdf = " .. dump(minetest.setting_get("asdf")))
 
+minetest.register_on_chat_message(function(name, message)
+	print("on_chat_message: name="..dump(name).." message="..dump(message))
+	local cmd = "/testcommand"
+	if message:sub(0, #cmd) == cmd then
+		print(cmd.." invoked")
+		return true
+	end
+	local cmd = "/help"
+	if message:sub(0, #cmd) == cmd then
+		print("script-overridden help command")
+		minetest.chat_send_all("script-overridden help command")
+		return true
+	end
+end)
+
 --
 -- Done, print some random stuff
 --

src/scriptapi.cpp

@@ -936,6 +936,31 @@ static int l_setting_getbool(lua_State *L)
 	return 1;
 }
 
+// chat_send_all(text)
+static int l_chat_send_all(lua_State *L)
+{
+	const char *text = luaL_checkstring(L, 1);
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
+	Server *server = (Server*)lua_touserdata(L, -1);
+	// Send
+	server->notifyPlayers(narrow_to_wide(text));
+	return 0;
+}
+
+// chat_send_player(name, text)
+static int l_chat_send_player(lua_State *L)
+{
+	const char *name = luaL_checkstring(L, 1);
+	const char *text = luaL_checkstring(L, 2);
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
+	Server *server = (Server*)lua_touserdata(L, -1);
+	// Send
+	server->notifyPlayer(name, narrow_to_wide(text));
+	return 0;
+}
+
 static const struct luaL_Reg minetest_f [] = {
 	{"register_nodedef_defaults", l_register_nodedef_defaults},
 	{"register_entity", l_register_entity},
@@ -951,6 +976,8 @@ static const struct luaL_Reg minetest_f [] = {
 	{"register_on_respawnplayer", l_register_on_respawnplayer},
 	{"setting_get", l_setting_get},
 	{"setting_getbool", l_setting_getbool},
+	{"chat_send_all", l_chat_send_all},
+	{"chat_send_player", l_chat_send_player},
 	{NULL, NULL}
 };
 
@@ -1594,6 +1621,26 @@ void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj)
 	lua_settable(L, objectstable);
 }
 
+bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
+		const std::string &message)
+{
+	realitycheck(L);
+	assert(lua_checkstack(L, 20));
+	StackUnroller stack_unroller(L);
+
+	// Get minetest.on_chat_message builtin function
+	lua_getglobal(L, "minetest");
+	lua_getfield(L, -1, "on_chat_message");
+	luaL_checktype(L, -1, LUA_TFUNCTION);
+
+	// Call function
+	lua_pushstring(L, name.c_str());
+	lua_pushstring(L, message.c_str());
+	if(lua_pcall(L, 2, 1, 0))
+		script_error(L, "error: %s\n", lua_tostring(L, -1));
+	bool ate = lua_toboolean(L, -1);
+	return ate;
+}
 
 /*
 	misc
@@ -1791,7 +1838,7 @@ void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp)
 {
 	realitycheck(L);
 	assert(lua_checkstack(L, 20));
-	infostream<<"scriptapi_environment_on_generated"<<std::endl;
+	//infostream<<"scriptapi_environment_on_generated"<<std::endl;
 	StackUnroller stack_unroller(L);
 
 	// Get minetest.registered_on_generateds

src/scriptapi.h

@@ -37,6 +37,10 @@ void scriptapi_add_environment(lua_State *L, ServerEnvironment *env);
 void scriptapi_add_object_reference(lua_State *L, ServerActiveObject *cobj);
 void scriptapi_rm_object_reference(lua_State *L, ServerActiveObject *cobj);
 
+// Returns true if script handled message
+bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
+		const std::string &message);
+
 /* environment */
 // On environment step
 void scriptapi_environment_step(lua_State *L, float dtime);

src/server.cpp

@@ -3422,6 +3422,13 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 		// Get player name of this client
 		std::wstring name = narrow_to_wide(player->getName());
 		
+		// Run script hook
+		bool ate = scriptapi_on_chat_message(m_lua, player->getName(),
+				wide_to_narrow(message));
+		// If script ate the message, don't proceed
+		if(ate)
+			return;
+		
 		// Line to send to players
 		std::wstring line;
 		// Whether to send to the player that sent the line