Add minetest.is_singleplayer()

doc/lua_api.txt

@@ -424,6 +424,7 @@ minetest.get_modpath(modname) -> eg. "/home/user/.minetest/usermods/modname"
 ^ Useful for loading additional .lua modules or static data from mod
 minetest.get_worldpath() -> eg. "/home/user/.minetest/world"
 ^ Useful for storing custom data
+minetest.is_singleplayer()
 
 minetest.debug(line)
 ^ Goes to dstream

src/scriptapi.cpp

@@ -3840,6 +3840,13 @@ static int l_sound_stop(lua_State *L)
 	return 0;
 }
 
+// is_singleplayer()
+static int l_is_singleplayer(lua_State *L)
+{
+	lua_pushboolean(L, get_server(L)->isSingleplayer());
+	return 1;
+}
+
 static const struct luaL_Reg minetest_f [] = {
 	{"debug", l_debug},
 	{"log", l_log},
@@ -3859,6 +3866,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"get_worldpath", l_get_worldpath},
 	{"sound_play", l_sound_play},
 	{"sound_stop", l_sound_stop},
+	{"is_singleplayer", l_is_singleplayer},
 	{NULL, NULL}
 };
 

src/server.h

@@ -583,6 +583,8 @@ public:
 	
 	std::string getWorldPath(){ return m_path_world; }
 
+	bool isSingleplayer(){ return m_simple_singleplayer_mode; }
+
 	void setAsyncFatalError(const std::string &error)
 	{
 		m_async_fatal_error.set(error);