update voxel fragments lua api & replace structure.save command with fragment.save & add 'export' entry point

src/logic/scripting/lua/libs/libgeneration.cpp

@@ -11,24 +11,30 @@
 
 using namespace scripting;
 
-static int l_save_structure(lua::State* L) {
-    auto pointA = lua::tovec<3>(L, 1);
-    auto pointB = lua::tovec<3>(L, 2);
-    auto filename = lua::require_string(L, 3);
-    if (!files::is_valid_name(filename)) {
-        throw std::runtime_error("invalid file name");
-    }
-    bool saveEntities = lua::toboolean(L, 4);
-    
-    auto structure = VoxelFragment::create(level, pointA, pointB, saveEntities);
-    auto map = structure->serialize();
-
-    auto bytes = json::to_binary(map);
-    files::write_bytes(fs::u8path(filename), bytes.data(), bytes.size());
+static int l_save_fragment(lua::State* L) {
+    auto paths = engine->getPaths();
+    auto fragment = lua::touserdata<lua::LuaVoxelFragment>(L, 1);
+    auto file = paths->resolve(lua::require_string(L, 2), true);
+    auto map = fragment->getFragment()->serialize();
+    auto bytes = json::to_binary(map, true);
+    files::write_bytes(file, bytes.data(), bytes.size());
     return 0;
 }
 
-static int l_load_structure(lua::State* L) {
+static int l_create_fragment(lua::State* L) {
+    auto pointA = lua::tovec<3>(L, 1);
+    auto pointB = lua::tovec<3>(L, 2);
+    bool crop = lua::toboolean(L, 3);
+    bool saveEntities = lua::toboolean(L, 4);
+
+    auto fragment =
+        VoxelFragment::create(level, pointA, pointB, crop, saveEntities);
+    return lua::newuserdata<lua::LuaVoxelFragment>(
+        L, std::shared_ptr<VoxelFragment>(std::move(fragment))
+    );
+}
+
+static int l_load_fragment(lua::State* L) {
     auto paths = engine->getPaths();
     auto [prefix, filename] = EnginePaths::parsePath(lua::require_string(L, 1));
 
@@ -38,9 +44,9 @@ static int l_load_structure(lua::State* L) {
     }
     auto map = files::read_binary_json(path);
 
-    auto structure = std::make_shared<VoxelFragment>();
-    structure->deserialize(map);
-    return lua::newuserdata<lua::LuaVoxelStructure>(L, std::move(structure));
+    auto fragment = std::make_shared<VoxelFragment>();
+    fragment->deserialize(map);
+    return lua::newuserdata<lua::LuaVoxelFragment>(L, std::move(fragment));
 }
 
 /// @brief Get a list of all world generators
@@ -72,8 +78,9 @@ static int l_get_default_generator(lua::State* L) {
 }
 
 const luaL_Reg generationlib[] = {
-    {"save_structure", lua::wrap<l_save_structure>},
-    {"load_structure", lua::wrap<l_load_structure>},
+    {"create_fragment", lua::wrap<l_create_fragment>},
+    {"save_fragment", lua::wrap<l_save_fragment>},
+    {"load_fragment", lua::wrap<l_load_fragment>},
     {"get_generators", lua::wrap<l_get_generators>},
     {"get_default_generator", lua::wrap<l_get_default_generator>},
     {NULL, NULL}};