Add minetest.get_worldpath() for getting location for custom data

data/mods/default/init.lua

@@ -118,6 +118,9 @@
 --                  {type="node", pos={x=, y=, z=}}
 -- minetest.get_current_modname() -> string
 -- minetest.get_modpath(modname) -> eg. "/home/user/.minetest/usermods/modname"
+-- ^ Useful for loading additional .lua modules or static data from mod
+-- minetest.get_worldpath(modname) -> eg. "/home/user/.minetest/world"
+-- ^ Useful for storing custom data
 --
 -- minetest.debug(line)
 -- ^ Goes to dstream

data/mods/experimental/init.lua

@@ -540,5 +540,6 @@ minetest.register_abm({
 
 print("experimental modname="..dump(minetest.get_current_modname()))
 print("experimental modpath="..dump(minetest.get_modpath("experimental")))
+print("experimental worldpath="..dump(minetest.get_worldpath()))
 
 -- END

src/scriptapi.cpp

@@ -3560,6 +3560,14 @@ static int l_get_modpath(lua_State *L)
 	return 1;
 }
 
+// get_worldpath()
+static int l_get_worldpath(lua_State *L)
+{
+	std::string worldpath = get_server(L)->getWorldPath();
+	lua_pushstring(L, worldpath.c_str());
+	return 1;
+}
+
 static const struct luaL_Reg minetest_f [] = {
 	{"debug", l_debug},
 	{"log", l_log},
@@ -3576,6 +3584,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"get_hitting_properties", l_get_hitting_properties},
 	{"get_current_modname", l_get_current_modname},
 	{"get_modpath", l_get_modpath},
+	{"get_worldpath", l_get_worldpath},
 	{NULL, NULL}
 };
 

src/server.h

@@ -525,6 +525,8 @@ public:
 	IWritableCraftDefManager* getWritableCraftDefManager();
 
 	const ModSpec* getModSpec(const std::string &modname);
+	
+	std::string getWorldPath(){ return m_mapsavedir; }
 
 private: