supertux/src/supertux/main.cpp

//  SuperTux
//  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "supertux/main.hpp"

#include <config.h>
#include <version.h>
#include <filesystem>
#include <fstream>

#include <SDL_image.h>
#include <SDL_ttf.h>
#include <physfs.h>
#include <tinygettext/log.hpp>
#include <fmt/format.h>
extern "C" {
#include <findlocale.h>
}

#ifdef WIN32
#include <codecvt>
#endif

#include "addon/addon_manager.hpp"
#include "addon/downloader.hpp"
#include "audio/sound_manager.hpp"
#include "editor/editor.hpp"
#include "editor/layer_icon.hpp"
#include "editor/object_info.hpp"
#include "editor/tile_selection.hpp"
#include "editor/tip.hpp"
#include "editor/tool_icon.hpp"
#include "gui/dialog.hpp"
#include "gui/menu_manager.hpp"
#include "gui/notification.hpp"
#include "math/random.hpp"
#include "object/player.hpp"
#include "object/spawnpoint.hpp"
#include "physfs/physfs_file_system.hpp"
#include "physfs/physfs_sdl.hpp"
#include "physfs/util.hpp"
#include "port/emscripten.hpp"
#include "sdk/integration.hpp"
#include "sprite/sprite_data.hpp"
#include "sprite/sprite_manager.hpp"
#include "supertux/command_line_arguments.hpp"
#include "supertux/console.hpp"
#include "supertux/error_handler.hpp"
#include "supertux/game_manager.hpp"
#include "supertux/game_session.hpp"
#include "supertux/gameconfig.hpp"
#include "supertux/globals.hpp"
#include "supertux/level.hpp"
#include "supertux/level_parser.hpp"
#include "supertux/player_status.hpp"
#include "supertux/resources.hpp"
#include "supertux/savegame.hpp"
#include "supertux/screen_fade.hpp"
#include "supertux/screen_manager.hpp"
#include "supertux/sector.hpp"
#include "supertux/tile.hpp"
#include "supertux/tile_manager.hpp"
#include "supertux/title_screen.hpp"
#include "supertux/world.hpp"
#include "supertux/menu/download_dialog.hpp"
#include "util/file_system.hpp"
#include "util/gettext.hpp"
#include "util/reader_document.hpp"
#include "util/reader_mapping.hpp"
#include "util/string_util.hpp"
#include "util/timelog.hpp"
#include "util/string_util.hpp"
#include "video/sdl_surface.hpp"
#include "video/sdl_surface_ptr.hpp"
#include "video/ttf_surface_manager.hpp"
#include "worldmap/worldmap.hpp"
#include "worldmap/worldmap_screen.hpp"

static Timelog s_timelog;

ConfigSubsystem::ConfigSubsystem() :
  m_config()
{
  g_config = &m_config;
  try {
    m_config.load();
  }
  catch(const std::exception& e)
  {
    log_info << "Couldn't load config file: " << e.what() << ", using default settings" << std::endl;
  }

  // init random number stuff
  gameRandom.seed(m_config.random_seed);
  graphicsRandom.seed(0);
  //const char *how = config->random_seed? ", user fixed.": ", from time().";
  //log_info << "Using random seed " << config->random_seed << how << std::endl;
}

ConfigSubsystem::~ConfigSubsystem()
{
  try
  {
    m_config.save();
  }
  catch(std::exception& e)
  {
    log_warning << "Error saving config: " << e.what() << std::endl;
  }
}

Main::Main() :
  m_physfs_subsystem(),
  m_config_subsystem(),
  m_sdl_subsystem(),
  m_console_buffer(),
  m_input_manager(),
  m_video_system(),
  m_ttf_surface_manager(),
  m_sound_manager(),
  m_squirrel_virtual_machine(),
  m_tile_manager(),
  m_sprite_manager(),
  m_profile_manager(),
  m_resources(),
  m_addon_manager(),
  m_console(),
  m_game_manager(),
  m_screen_manager(),
  m_savegame(),
  m_downloader() // Used for getting the version of the latest SuperTux release.
{
}

void
Main::init_tinygettext()
{
  g_dictionary_manager.reset(new tinygettext::DictionaryManager(std::make_unique<PhysFSFileSystem>(), "UTF-8"));

  tinygettext::Log::set_log_info_callback(log_info_callback);
  tinygettext::Log::set_log_warning_callback(log_warning_callback);
  tinygettext::Log::set_log_error_callback(log_error_callback);

  g_dictionary_manager->add_directory("locale");

  // Config setting "locale" overrides language detection
  if (!g_config->locale.empty())
  {
    g_dictionary_manager->set_language(tinygettext::Language::from_name(g_config->locale));
  }
  else
  {
    FL_Locale *locale;
    FL_FindLocale(&locale);
    tinygettext::Language language = tinygettext::Language::from_spec( locale->lang?locale->lang:"", locale->country?locale->country:"", locale->variant?locale->variant:"");
    FL_FreeLocale(&locale);
    g_dictionary_manager->set_language(language);
  }
}

PhysfsSubsystem::PhysfsSubsystem(const char* argv0,
                std::optional<std::string> forced_datadir,
                std::optional<std::string> forced_userdir) :
  m_forced_datadir(std::move(forced_datadir)),
  m_forced_userdir(std::move(forced_userdir)),
  m_datadir(),
  m_userdir()
{
  if (!PHYSFS_init(argv0))
  {
    std::stringstream msg;
    msg << "Couldn't initialize physfs: " << physfsutil::get_last_error();
    throw std::runtime_error(msg.str());
  }
  else
  {
    // allow symbolic links
    PHYSFS_permitSymbolicLinks(1);

    find_mount_datadir();
    find_mount_userdir();
  }
}

void PhysfsSubsystem::find_mount_datadir()
{
#ifndef __EMSCRIPTEN__
  if (const char* assetpack = getenv("ANDROID_ASSET_PACK_PATH"))
  {
    // Android asset pack has a hardcoded prefix for data files, and PhysFS cannot strip it, so we mount an archive inside an archive
    if (!PHYSFS_mount(std::filesystem::canonical(assetpack).string().c_str(), nullptr, 1))
    {
      log_warning << "Couldn't add '" << assetpack << "' to physfs searchpath: " << physfsutil::get_last_error() << std::endl;
      return;
    }

    PHYSFS_File* data = PHYSFS_openRead("assets/data.zip");
    if (!data)
    {
      log_warning << "Couldn't open assets/data.zip inside '" << assetpack << "' : " << physfsutil::get_last_error() << std::endl;
      return;
    }

    if (!PHYSFS_mountHandle(data, "assets/data.zip", nullptr, 1))
    {
      log_warning << "Couldn't add assets/data.zip inside '" << assetpack << "' to physfs searchpath: " << physfsutil::get_last_error() << std::endl;
    }

    return;
  }

  if (m_forced_datadir)
  {
    m_datadir = *m_forced_datadir;
  }
  else if (const char* env_datadir = getenv("SUPERTUX2_DATA_DIR"))
  {
    m_datadir = env_datadir;
  }
  else if (const char* env_datadir3 = getenv("ANDROID_MY_OWN_APP_FILE"))
  {
    m_datadir = env_datadir3;
  }
  else
  {
    // check if we run from source dir
    char* basepath_c = SDL_GetBasePath();
    std::string basepath = basepath_c ? basepath_c : "./";
    SDL_free(basepath_c);

    if (FileSystem::exists(FileSystem::join(BUILD_DATA_DIR, "credits.stxt")))
    {
      m_datadir = BUILD_DATA_DIR;

      // Add config dir for supplemental files
      if (FileSystem::is_directory(BUILD_CONFIG_DATA_DIR))
      {
        PHYSFS_mount(std::filesystem::canonical(BUILD_CONFIG_DATA_DIR).string().c_str(), nullptr, 1);
      }
    }
    else
    {
      // if the game is not run from the source directory, try to find
      // the global install location
      m_datadir = basepath.substr(0, basepath.rfind(INSTALL_SUBDIR_BIN));
      m_datadir = FileSystem::join(m_datadir, INSTALL_SUBDIR_SHARE);
    }
  }

  if (!PHYSFS_mount(std::filesystem::canonical(m_datadir).string().c_str(), nullptr, 1))
  {
    log_warning << "Couldn't add '" << m_datadir << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
#else
  if (!PHYSFS_mount(BUILD_CONFIG_DATA_DIR, nullptr, 1))
  {
    log_warning << "Couldn't add '" << BUILD_CONFIG_DATA_DIR << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
#endif
}

/** Re-mounts all essential directories, relative to the data directory, which may have been
    overriden in the search path by the user directory or add-ons. */
void PhysfsSubsystem::remount_datadir_static() const
{
  add_data_to_search_path("images/credits");
  add_data_to_search_path("levels");
  add_data_to_search_path("locale");
  add_data_to_search_path("scripts");
  add_data_to_search_path("shader");

  // Re-mount levels from the user directory
  const std::string userdir_levels = FileSystem::join(m_userdir, "levels");
  if (FileSystem::exists(userdir_levels) &&
      !PHYSFS_mount(userdir_levels.c_str(), "levels", 0))
  {
    log_warning << "Couldn't mount levels from the user directory '" << m_userdir << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
}

void PhysfsSubsystem::add_data_to_search_path(const std::string& dir) const
{
#ifndef __EMSCRIPTEN__
  if (!PHYSFS_mount(FileSystem::join(std::filesystem::canonical(m_datadir).string(), dir).c_str(), dir.c_str(), 0))
  {
    log_warning << "Couldn't add '" << m_datadir << "/" << dir << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
#else
  if (!PHYSFS_mount(FileSystem::join(BUILD_CONFIG_DATA_DIR, dir).c_str(), dir.c_str(), 0))
  {
    log_warning << "Couldn't add '" << BUILD_CONFIG_DATA_DIR << "/" << dir << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
#endif
}

void PhysfsSubsystem::find_mount_userdir()
{
  if (m_forced_userdir)
  {
    m_userdir = *m_forced_userdir;
  }
  else if (const char* env_userdir = getenv("SUPERTUX2_USER_DIR"))
  {
    m_userdir = env_userdir;
  }
  else
  {
    m_userdir = PHYSFS_getPrefDir("SuperTux","supertux2");
  }
//Kept for backwards-compatability only, hence the silence
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
std::string physfs_userdir = PHYSFS_getUserDir();
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

#ifndef __HAIKU__
#ifdef _WIN32
std::string olduserdir = FileSystem::join(physfs_userdir, PACKAGE_NAME);
#else
std::string olduserdir = FileSystem::join(physfs_userdir, "." PACKAGE_NAME);
#endif
if (FileSystem::is_directory(olduserdir)) {
  std::filesystem::path olduserpath(olduserdir);
  std::filesystem::path userpath(m_userdir);

  std::filesystem::directory_iterator end_itr;

  bool success = true;

  // cycle through the directory
  for (std::filesystem::directory_iterator itr(olduserpath); itr != end_itr; ++itr) {
  try
  {
    std::filesystem::rename(itr->path().string().c_str(), userpath / itr->path().filename());
  }
  catch (const std::filesystem::filesystem_error& err)
  {
    success = false;
    log_warning << "Failed to move contents of config directory: " << err.what() << std::endl;
  }
  }
  if (success) {
    try
    {
      std::filesystem::remove_all(olduserpath);
    }
    catch (const std::filesystem::filesystem_error& err)
    {
      success = false;
      log_warning << "Failed to remove old config directory: " << err.what();
    }
  }
  if (success) {
    log_info << "Moved old config dir " << olduserdir << " to " << m_userdir << std::endl;
  }
}
#endif

#ifdef EMSCRIPTEN
  m_userdir = "/home/web_user/.local/share/supertux2/";
#endif

  if (!FileSystem::is_directory(m_userdir))
  {
    FileSystem::mkdir(m_userdir);
    log_info << "Created SuperTux userdir: " << m_userdir << std::endl;
  }

#ifdef EMSCRIPTEN
  EM_ASM({
    try {
      FS.mount(IDBFS, {}, m_userdir);
      FS.syncfs(true, (err) => { console.log(err); });
    } catch(err) {}
  }, 0); // EM_ASM is a variadic macro and Clang requires at least 1 value for the variadic argument
#endif

  if (!PHYSFS_setWriteDir(m_userdir.c_str()))
  {
    std::ostringstream msg;
    msg << "Failed to use userdir directory '"
        <<  m_userdir << "': errorcode: " << physfsutil::get_last_error();
    throw std::runtime_error(msg.str());
  }

  if (!PHYSFS_mount(m_userdir.c_str(), nullptr, 0))
  {
    log_warning << "Couldn't add user directory '" << m_userdir << "' to PhysFS searchpath: " << physfsutil::get_last_error() << std::endl;
  }
}

void PhysfsSubsystem::print_search_path()
{
  const char* writedir = PHYSFS_getWriteDir();
  log_info << "PhysfsWriteDir: " << (writedir ? writedir : "(null)") << std::endl;
  log_info << "PhysfsSearchPath:" << std::endl;
  char** searchpath = PHYSFS_getSearchPath();
  for (char** i = searchpath; *i != nullptr; ++i)
  {
    log_info << "  " << *i << std::endl;
  }
  PHYSFS_freeList(searchpath);
}

PhysfsSubsystem::~PhysfsSubsystem()
{
  PHYSFS_deinit();
}

SDLSubsystem::SDLSubsystem()
{
  Uint32 flags = SDL_INIT_TIMER | SDL_INIT_VIDEO;
#ifndef UBUNTU_TOUCH
  flags |= SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER;
#endif
  if (SDL_Init(flags) < 0)
  {
    std::stringstream msg;
    msg << "Couldn't initialize SDL: " << SDL_GetError();
    throw std::runtime_error(msg.str());
  }

  if (TTF_Init() < 0)
  {
    std::stringstream msg;
    msg << "Couldn't initialize SDL TTF: " << SDL_GetError();
    throw std::runtime_error(msg.str());
  }

  // just to be sure
  atexit(TTF_Quit);
  atexit(SDL_Quit);
}

SDLSubsystem::~SDLSubsystem()
{
  TTF_Quit();
  SDL_Quit();
}

void
Main::init_video()
{
  VideoSystem::current()->set_title("SuperTux " PACKAGE_VERSION);

  const char* icon_fname = "images/engine/icons/supertux-256x256.png";

  SDLSurfacePtr icon = SDLSurface::from_file(icon_fname);
  VideoSystem::current()->set_icon(*icon);

  SDL_ShowCursor(g_config->custom_mouse_cursor ? 0 : 1);

  log_info << (g_config->use_fullscreen?"fullscreen ":"window ")
           << " Window: "     << g_config->window_size
           << " Fullscreen: " << g_config->fullscreen_size << "@" << g_config->fullscreen_refresh_rate
           << " Area: "       << g_config->aspect_size << std::endl;
}

void
Main::resave(const std::string& input_filename, const std::string& output_filename)
{
  Editor::s_resaving_in_progress = true;
  std::ifstream in(input_filename);
  if (!in) {
    log_fatal << input_filename << ": couldn't open file for reading" << std::endl;
  } else {
    log_info << "loading level: " << input_filename << std::endl;
    auto level = LevelParser::from_stream(in, input_filename, StringUtil::has_suffix(input_filename, ".stwm"), true);
    in.close();

    std::ofstream out(output_filename);
    if (!out) {
      log_fatal << output_filename << ": couldn't open file for writing" << std::endl;
    } else {
      log_info << "saving level: " << output_filename << std::endl;
      level->save(out);
    }
  }
  Editor::s_resaving_in_progress = false;
}

void
Main::launch_game(const CommandLineArguments& args)
{
  s_timelog.log("addons");
  m_addon_manager.reset(new AddonManager("addons", g_config->addons));

  /** Add-ons or the user directory may have possibly overriden essential files,
      so re-mount the directories, containing those files. */
  m_physfs_subsystem->remount_datadir_static();

  m_sdl_subsystem.reset(new SDLSubsystem());
  m_console_buffer.reset(new ConsoleBuffer());
#ifdef ENABLE_TOUCHSCREEN_SUPPORT
  if (getenv("ANDROID_TV")) {
    g_config->mobile_controls = false;
  }
#endif

  s_timelog.log("controller");
  m_input_manager.reset(new InputManager(g_config->keyboard_config, g_config->joystick_config));

  s_timelog.log("commandline");

#ifndef EMSCRIPTEN
  auto video = g_config->video;
  if (args.resave && *args.resave) {
    if (args.video) {
      video = *args.video;
    } else {
      video = VideoSystem::VIDEO_NULL;
    }
  }
  s_timelog.log("video");

  m_video_system = VideoSystem::create(video);
#else
  // Force SDL for WASM builds, as OpenGL is reportedly slow on some devices
  m_video_system = VideoSystem::create(VideoSystem::VIDEO_SDL);
#endif
  init_video();

  m_ttf_surface_manager.reset(new TTFSurfaceManager());

  s_timelog.log("audio");
  m_sound_manager.reset(new SoundManager());
  m_sound_manager->enable_sound(g_config->sound_enabled);
  m_sound_manager->enable_music(g_config->music_enabled);
  m_sound_manager->set_sound_volume(g_config->sound_volume);
  m_sound_manager->set_music_volume(g_config->music_volume);

  s_timelog.log("scripting");
  m_squirrel_virtual_machine.reset(new SquirrelVirtualMachine(g_config->enable_script_debugger));

  s_timelog.log("resources");
  m_tile_manager.reset(new TileManager());
  m_sprite_manager.reset(new SpriteManager());
  m_profile_manager.reset(new ProfileManager());
  m_resources.reset(new Resources());

  s_timelog.log("integrations");
  Integration::setup();

  m_console.reset(new Console(*m_console_buffer));

  s_timelog.log(nullptr);

  m_savegame = std::make_unique<Savegame>(m_profile_manager->get_current_profile(), "");

  m_game_manager.reset(new GameManager());
  m_screen_manager.reset(new ScreenManager(*m_video_system, *m_input_manager));

  if (!args.filenames.empty())
  {
    for(const auto& start_level : args.filenames)
    {
      // we have a normal path specified at commandline, not a physfs path.
      // So we simply mount that path here...
      std::string dir = FileSystem::dirname(start_level);
      const std::string filename = FileSystem::basename(start_level);
      const std::string fileProtocol = "file://";
      const std::string::size_type position = dir.find(fileProtocol);
      if (position != std::string::npos) {
        dir = dir.replace(position, fileProtocol.length(), "");
      }
      log_debug << "Adding dir: " << dir << std::endl;
      PHYSFS_mount(dir.c_str(), nullptr, true);

      if (args.resave && *args.resave)
      {
        resave(start_level, start_level);
      }
      else if (args.editor)
      {
        if (PHYSFS_exists(start_level.c_str())) {
          auto editor = std::make_unique<Editor>();
          editor->set_level(start_level);
          editor->setup();
          editor->update(0, Controller());
          m_screen_manager->push_screen(std::move(editor));
          MenuManager::instance().clear_menu_stack();
          m_sound_manager->stop_music(0.5);
        } else {
          log_warning << "Level " << start_level << " doesn't exist." << std::endl;
        }
      }
      else if (StringUtil::has_suffix(start_level, ".stwm"))
      {
        m_screen_manager->push_screen(std::make_unique<worldmap::WorldMapScreen>(
                                     std::make_unique<worldmap::WorldMap>(filename, *m_savegame)));
      }
      else
      { // launch game
        std::unique_ptr<GameSession> session = std::make_unique<GameSession>(filename, *m_savegame);

        gameRandom.seed(g_config->random_seed);
        graphicsRandom.seed(0);

        if (args.sector || args.spawnpoint)
        {
          std::string sectorname = args.sector.value_or("main");

          const auto& spawnpoints = session->get_current_sector().get_objects_by_type<SpawnPointMarker>();
          std::string default_spawnpoint = (spawnpoints.begin() != spawnpoints.end()) ?
            "" : spawnpoints.begin()->get_name();
          std::string spawnpointname = args.spawnpoint.value_or(default_spawnpoint);

          session->set_start_point(sectorname, spawnpointname);
          session->restart_level();
        }

        if (g_config->tux_spawn_pos)
        {
          // FIXME: Specify start pos for multiple players
          session->get_current_sector().get_players()[0]->set_pos(*g_config->tux_spawn_pos);
        }

        m_screen_manager->push_screen(std::move(session));
      }
    }
  }
  else
  {
    if (args.editor)
    {
      m_screen_manager->push_screen(std::make_unique<Editor>());
    }
    else
    {
      m_screen_manager->push_screen(std::make_unique<TitleScreen>(*m_savegame, g_config->is_christmas()));

      if (g_config->do_release_check)
        release_check();
    }
  }

  m_screen_manager->run();
}

int
Main::run(int argc, char** argv)
{
  // First and foremost, set error handlers (to print stack trace on SIGSEGV, etc.)
  ErrorHandler::set_handlers();

#ifdef __EMSCRIPTEN__
  init_emscripten();
#endif

#ifdef WIN32
	//SDL is used instead of PHYSFS because both create the same path in app data
	//However, PHYSFS is not yet initizlized, and this should be run before anything is initialized
	std::string prefpath = SDL_GetPrefPath("SuperTux", "supertux2");

	std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;

	//All this conversion stuff is necessary to make this work for internationalized usernames
	std::string outpath = prefpath + u8"/console.out";
	std::wstring w_outpath = converter.from_bytes(outpath);
	_wfreopen(w_outpath.c_str(), L"a", stdout);

	std::string errpath = prefpath + u8"/console.err";
	std::wstring w_errpath = converter.from_bytes(errpath);
	_wfreopen(w_errpath.c_str(), L"a", stderr);

  // Create and install global locale - this can fail on some situations:
  // - with bad values for env vars (LANG, LC_ALL, ...)
  // - targets where libstdc++ uses its generic locales code (https://gcc.gnu.org/legacy-ml/libstdc++/2003-02/msg00345.html)
  try
  {
    std::locale::global(std::locale::classic());
  }
  catch(const std::runtime_error& err)
  {
    std::cout << "Warning: " << err.what() << std::endl;
  }
#endif

  int result = 0;

  try
  {
    CommandLineArguments args;
    try
    {
      args.parse_args(argc, argv);
      g_log_level = args.get_log_level();
    }
    catch(const std::exception& err)
    {
      std::cout << "Error: " << err.what() << std::endl;
      return EXIT_FAILURE;
    }

    m_physfs_subsystem.reset(new PhysfsSubsystem(argv[0], args.datadir, args.userdir));
    m_physfs_subsystem->print_search_path();

    s_timelog.log("config");
    m_config_subsystem.reset(new ConfigSubsystem());
    args.merge_into(*g_config);

    s_timelog.log("tinygettext");
    init_tinygettext();
    switch (args.get_action())
    {
      case CommandLineArguments::PRINT_VERSION:
        args.print_version();
        return 0;

      case CommandLineArguments::PRINT_HELP:
        args.print_help(argv[0]);
        return 0;

      case CommandLineArguments::PRINT_DATADIR:
        args.print_datadir();
        return 0;

      case CommandLineArguments::PRINT_ACKNOWLEDGEMENTS:
        args.print_acknowledgements();
        return 0;

      default:
        launch_game(args);
        break;
    }
  }
  catch(const std::exception& e)
  {
    log_fatal << "Unexpected exception: " << e.what() << std::endl;
    result = 1;
  }
  catch(...)
  {
    log_fatal << "Unexpected exception" << std::endl;
    result = 1;
  }

  g_dictionary_manager.reset();

#ifdef __ANDROID__
  // SDL2 keeps shared libraries loaded after the app is closed,
  // when we launch the app again the static initializers will run twice and crash the app.
  // So we just need to terminate the app process 'gracefully', without running destructors or atexit() functions.
  _exit(result);
#endif

  return result;
}

void
Main::release_check()
{
  // Detect a potential new release of SuperTux. If a release, other than
  // the current one is indicated on the given web file, show a notification on the main menu screen.
  const std::string target_file = "ver_info.nfo";
  TransferStatusPtr status = m_downloader.request_download("https://raw.githubusercontent.com/SuperTux/addons/master/ver_info.nfo", target_file);
  status->then([target_file, status](bool success)
  {
    if (!success)
    {
      log_warning << "Error performing new release check: Failed to download \"supertux-versioninfo\" file: " << status->error_msg << std::endl;
      return;
    }
    auto doc = ReaderDocument::from_file(target_file);
    auto root = doc.get_root();
    if (root.get_name() != "supertux-versioninfo")
    {
      log_warning << "File is not a \"supertux-versioninfo\" file." << std::endl;
      return;
    }
    auto mapping = root.get_mapping();
    std::string latest_ver;
    if (mapping.get("latest", latest_ver))
    {
      const std::string version_full = std::string(PACKAGE_VERSION);
      const std::string version = version_full.substr(version_full.find("v") + 1, version_full.find("-") - 1);
      if (version != latest_ver)
      {
        auto notif = std::make_unique<Notification>("new_release_" + latest_ver);
        notif->set_text(fmt::format(fmt::runtime(_("New release: SuperTux v{}!")), latest_ver));
        notif->on_press([latest_ver]()
                       {
                         Dialog::show_confirmation(fmt::format(fmt::runtime(_("A new release of SuperTux (v{}) is available!\nFor more information, you can visit the SuperTux website.\n\nDo you want to visit the website now?")), latest_ver), []()
                                                   {
                                                     FileSystem::open_url("https://supertux.org");
                                                   });
                       });
        MenuManager::instance().set_notification(std::move(notif));
      }
    }
  });
  // Set up a download dialog to update the transfer status.
  auto dialog = std::make_unique<DownloadDialog>(status, true, true, true);
  dialog->set_title(_("Checking for new releases..."));
  MenuManager::instance().set_dialog(std::move(dialog));
}

/* EOF */