Add `minetest.get_mapgen_edges` (#12999)

2 files changed, 39 insertions, 0 deletions

diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index 1e4197df3..2e17d0d67 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -810,6 +810,41 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
 	return 0;
 }
 
+// get_mapgen_edges([mapgen_limit[, chunksize]])
+int ModApiMapgen::l_get_mapgen_edges(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+
+	MapSettingsManager *settingsmgr = getServer(L)->getEmergeManager()->map_settings_mgr;
+
+	// MapSettingsManager::makeMapgenParams cannot be used here because it would
+	// make mapgen settings immutable from then on. Mapgen settings should stay
+	// mutable until after mod loading ends.
+
+	s16 mapgen_limit;
+	if (lua_isnumber(L, 1)) {
+		 mapgen_limit = lua_tointeger(L, 1);
+	} else {
+		std::string mapgen_limit_str;
+		settingsmgr->getMapSetting("mapgen_limit", &mapgen_limit_str);
+		mapgen_limit = stoi(mapgen_limit_str, 0, MAX_MAP_GENERATION_LIMIT);
+	}
+
+	s16 chunksize;
+	if (lua_isnumber(L, 2)) {
+		chunksize = lua_tointeger(L, 2);
+	} else {
+		std::string chunksize_str;
+		settingsmgr->getMapSetting("chunksize", &chunksize_str);
+		chunksize = stoi(chunksize_str, -32768, 32767);
+	}
+
+	std::pair<s16, s16> edges = get_mapgen_edges(mapgen_limit, chunksize);
+	push_v3s16(L, v3s16(1, 1, 1) * edges.first);
+	push_v3s16(L, v3s16(1, 1, 1) * edges.second);
+	return 2;
+}
+
 // get_mapgen_setting(name)
 int ModApiMapgen::l_get_mapgen_setting(lua_State *L)
 {
@@ -1782,6 +1817,7 @@ void ModApiMapgen::Initialize(lua_State *L, int top)
 
 	API_FCT(get_mapgen_params);
 	API_FCT(set_mapgen_params);
+	API_FCT(get_mapgen_edges);
 	API_FCT(get_mapgen_setting);
 	API_FCT(set_mapgen_setting);
 	API_FCT(get_mapgen_setting_noiseparams);
diff --git a/src/script/lua_api/l_mapgen.h b/src/script/lua_api/l_mapgen.h
index 0bdc56fc5..1428a91c8 100644
--- a/src/script/lua_api/l_mapgen.h
+++ b/src/script/lua_api/l_mapgen.h
@@ -61,6 +61,9 @@ private:
 	// set mapgen parameters
 	static int l_set_mapgen_params(lua_State *L);
 
+	// get_mapgen_edges([mapgen_limit[, chunksize]])
+	static int l_get_mapgen_edges(lua_State *L);
+
 	// get_mapgen_setting(name)
 	static int l_get_mapgen_setting(lua_State *L);