Brought over a bunch of code from the roguelike and now will use it to generate a random map.

save.cpp

@@ -0,0 +1,96 @@
+#include "save.hpp"
+#include <fstream>
+#include "dbc.hpp"
+#include <fmt/core.h>
+#include "config.hpp"
+#include <filesystem>
+
+using namespace components;
+using namespace fmt;
+
+template<typename CompT>
+inline void extract(DinkyECS::World &world, std::map<DinkyECS::Entity, CompT> &into) {
+  auto from_world = world.entity_map_for<CompT>();
+  for(auto [entity, value] : from_world) {
+    into[entity] = std::any_cast<CompT>(value);
+  }
+}
+
+void save::to_file(fs::path path, DinkyECS::World &world, Map &map) {
+  SaveData save_data;
+  tser::BinaryArchive archive;
+
+  save_data.facts.player = world.get_the<Player>();
+  save_data.map = MapData{
+    map.$width, map.$height,
+    map.$rooms, map.$walls};
+
+  // BUG: lights aren't saved/restored
+  extract<Position>(world, save_data.position);
+  extract<Combat>(world, save_data.combat);
+  extract<Motion>(world, save_data.motion);
+  extract<Tile>(world, save_data.tile);
+  // extract<Inventory>(world, save_data.inventory);
+
+  archive.save(save_data);
+  std::string_view archive_view = archive.get_buffer();
+
+  std::ofstream out(path, std::ios::binary);
+  out << archive_view;
+  out.flush();
+}
+
+template<typename CompT>
+inline void inject(DinkyECS::World &world, std::map<DinkyECS::Entity, CompT> &outof) {
+  for(auto [entity, value] : outof) {
+    world.set<CompT>(entity, value);
+  }
+}
+
+void save::from_file(fs::path path, DinkyECS::World &world_out, Map &map_out) {
+  tser::BinaryArchive archive(0);
+  dbc::check(fs::exists(path), format("save file does not exist {}", path.string()));
+  auto size = fs::file_size(path);
+
+  if(std::ifstream in_file{path, std::ios::binary}) {
+    std::string in_data(size, '\0');
+
+    if(in_file.read(&in_data[0], size)) {
+      std::string_view in_view(in_data);
+      archive.initialize(in_view);
+    } else {
+      dbc::sentinel(format("wrong size or error reading {}", path.string()));
+    }
+  } else {
+    dbc::sentinel(format("failed to load file {}", path.string()));
+  }
+
+  auto save_data = archive.load<SaveData>();
+
+  world_out.set_the<Player>(save_data.facts.player);
+  inject<Position>(world_out, save_data.position);
+  inject<Combat>(world_out, save_data.combat);
+  inject<Motion>(world_out, save_data.motion);
+  inject<Tile>(world_out, save_data.tile);
+  // inject<Inventory>(world_out, save_data.inventory);
+
+  size_t width = save_data.map.width;
+  size_t height = save_data.map.height;
+
+  Pathing paths(width, height);
+  map_out = Map(save_data.map.walls, paths);
+
+  save::load_configs(world_out);
+}
+
+void save::load_configs(DinkyECS::World &world) {
+  Config game("./assets/config.json");
+  Config enemies("./assets/enemies.json");
+  Config items("./assets/items.json");
+  Config tiles("./assets/tiles.json");
+  Config devices("./assets/devices.json");
+
+  world.set_the<GameConfig>({
+    game, enemies, items, tiles, devices
+  });
+}