1 files changed, 41 insertions, 0 deletions
diff --git a/src/script/lua_api/l_mainmenu.cpp b/src/script/lua_api/l_mainmenu.cpp
index 789096d23..9c828430c 100644
--- a/src/script/lua_api/l_mainmenu.cpp
+++ b/src/script/lua_api/l_mainmenu.cpp
@@ -39,6 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client/renderingengine.h"
 #include "network/networkprotocol.h"
 #include "content/mod_configuration.h"
+#include "threading/mutex_auto_lock.h"
 
 /******************************************************************************/
 std::string ModApiMainMenu::getTextData(lua_State *L, std::string name)
@@ -1008,6 +1009,44 @@ int ModApiMainMenu::l_do_async_callback(lua_State *L)
 }
 
 /******************************************************************************/
+// this is intentionally a global and not part of MainMenuScripting or such
+namespace {
+	std::unordered_map<std::string, std::string> once_values;
+	std::mutex once_mutex;
+}
+
+int ModApiMainMenu::l_set_once(lua_State *L)
+{
+	std::string key = readParam<std::string>(L, 1);
+	if (lua_isnil(L, 2))
+		return 0;
+	std::string value = readParam<std::string>(L, 2);
+
+	{
+		MutexAutoLock lock(once_mutex);
+		once_values[key] = value;
+	}
+
+	return 0;
+}
+
+int ModApiMainMenu::l_get_once(lua_State *L)
+{
+	std::string key = readParam<std::string>(L, 1);
+
+	{
+		MutexAutoLock lock(once_mutex);
+		auto it = once_values.find(key);
+		if (it == once_values.end())
+			lua_pushnil(L);
+		else
+			lua_pushstring(L, it->second.c_str());
+	}
+
+	return 1;
+}
+
+/******************************************************************************/
 void ModApiMainMenu::Initialize(lua_State *L, int top)
 {
 	API_FCT(update_formspec);
@@ -1054,6 +1093,8 @@ void ModApiMainMenu::Initialize(lua_State *L, int top)
 	API_FCT(open_dir);
 	API_FCT(share_file);
 	API_FCT(do_async_callback);
+	API_FCT(set_once);
+	API_FCT(get_once);
 }
 
 /******************************************************************************/