From 87051fca268944248af8aa5edd027a9acd800bcf Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Mon, 17 Oct 2022 13:56:28 +0200
Subject: Take geographic distance into account for server list ordering
 (#12790)

---
 src/script/lua_api/l_mainmenu.cpp | 41 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'src/script/lua_api/l_mainmenu.cpp')

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)
@@ -1007,6 +1008,44 @@ int ModApiMainMenu::l_do_async_callback(lua_State *L)
 	return 1;
 }
 
+/******************************************************************************/
+// 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)
 {
@@ -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);
 }
 
 /******************************************************************************/
-- 
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