feat: add export / file packing

lightkeeper/src/main.cpp

@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <filesystem>
 #include <memory>
 #include <span>
 #include <stdexcept>
@@ -6,15 +7,52 @@
 #include <string_view>
 
 #include <SDL.h>
+#include <spdlog/sinks/basic_file_sink.h>
 #include <spdlog/spdlog.h>
 
+#include <destrum/FS/AssetFS.h>
 #include <editor/Editor.h>
 
 #include "Lightkeeper.h"
 
+namespace {
+    // Release builds have no console, so players only have this file to send when something goes wrong
+    std::filesystem::path addFileLog() {
+        char* prefPath = SDL_GetPrefPath("Destrum", "Lightkeeper");
+        if (prefPath == nullptr) {
+            spdlog::warn("No folder to write the log to: {}", SDL_GetError());
+            return {};
+        }
+        const std::filesystem::path logPath = std::filesystem::path{prefPath} / "lightkeeper.log";
+        SDL_free(prefPath);
+
+        try {
+            spdlog::default_logger()->sinks().push_back(
+                std::make_shared<spdlog::sinks::basic_file_sink_mt>(logPath.string(), true));
+        } catch (const spdlog::spdlog_ex& exception) {
+            spdlog::warn("Can't write the log to {}: {}", logPath.string(), exception.what());
+            return {};
+        }
+        // Every line, so the log survives a hard crash
+        spdlog::flush_on(spdlog::level::trace);
+        return logPath;
+    }
+
+    void showError(const std::string& message, const std::filesystem::path& logPath) {
+        std::string text = message;
+        if (!logPath.empty()) {
+            text += "\n\nThe log is at " + logPath.string();
+        }
+        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Lightkeeper", text.c_str(), nullptr);
+    }
+}
+
 int main(int argc, char* argv[]) {
+    const std::filesystem::path logPath = addFileLog();
+
     if (SDL_Init(SDL_INIT_VIDEO) != 0) {
-        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", SDL_GetError(), nullptr);
+        spdlog::critical("SDL_Init failed: {}", SDL_GetError());
+        showError(std::string{"Couldn't start SDL: "} + SDL_GetError(), logPath);
         return 1;
     }
 
@@ -39,7 +77,8 @@ int main(int argc, char* argv[]) {
             .windowTitle = "Lightkeeper",
             .exeDir = exeDir,
         });
-        if (!runGameOnly) {
+        // Exported builds only ship the cooked asset pack, the editor needs the source folders
+        if (!runGameOnly && !AssetFS::GetInstance().IsPacked()) {
             app.attachLayer(std::make_unique<Editor>(app, EditorSettings{
                 .gameAssetsSource = LIGHTKEEPER_ASSETS_SRC_DIR,
                 .scenePath = std::string{LightKeeper::MainScenePath},
@@ -49,6 +88,7 @@ int main(int argc, char* argv[]) {
         app.cleanup();
     } catch (const std::exception& exception) {
         spdlog::critical("Lightkeeper terminated with an error: {}", exception.what());
+        showError(std::string{"Lightkeeper ran into an error and has to close.\n\n"} + exception.what(), logPath);
         SDL_Quit();
         return 1;
     }