savegame.cpp

Go to the documentation of this file.

/*
    Copyright (C) 2003 - 2025
    by Jörg Hinrichs, David White <dave@whitevine.net>
    Part of the Battle for Wesnoth Project https://www.wesnoth.org/
 
    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 2 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.
 
    See the COPYING file for more details.
*/
 
 
#include "savegame.hpp"
 
#include "cursor.hpp"
#include "formatter.hpp"
#include "formula/string_utils.hpp"
#include "game_config_manager.hpp"
#include "game_config_view.hpp"
#include "game_end_exceptions.hpp"
#include "game_errors.hpp"
#include "game_version.hpp"
#include "gettext.hpp"
#include "gui/dialogs/campaign_difficulty.hpp"
#include "gui/dialogs/game_load.hpp"
#include "gui/dialogs/game_save.hpp"
#include "gui/dialogs/message.hpp"
#include "gui/dialogs/transient_message.hpp"
#include "gui/widgets/retval.hpp"
#include "log.hpp"
#include "persist_manager.hpp"
#include "preferences/preferences.hpp"
#include "resources.hpp"
#include "save_index.hpp"
#include "saved_game.hpp"
#include "serialization/binary_or_text.hpp"
#include "serialization/chrono.hpp"
#include "serialization/utf8_exception.hpp"
#include "utils/optimer.hpp"
#include "video.hpp" // only for faked
 
#include <iomanip>
 
static lg::log_domain log_engine("engine");
#define LOG_SAVE LOG_STREAM(info, log_engine)
#define ERR_SAVE LOG_STREAM(err, log_engine)
 
static lg::log_domain log_enginerefac("enginerefac");
#define LOG_RG LOG_STREAM(info, log_enginerefac)
 
namespace savegame
{
bool save_game_exists(std::string name, compression::format compressed)
{
    name += compression::format_extension(compressed);
    auto manager = save_index_class::default_saves_dir();
    return filesystem::file_exists(manager->dir() + "/" + name);
}
 
void clean_saves(const std::string& label)
{
    const std::string prefix = label + "-" + _("Auto-Save");
    LOG_SAVE << "Cleaning saves with prefix '" << prefix << "'";
 
    auto manager = save_index_class::default_saves_dir();
    for(const auto& save : manager->get_saves_list()) {
        if(save.name().compare(0, prefix.length(), prefix) == 0) {
            LOG_SAVE << "Deleting savegame '" << save.name() << "'";
            manager->delete_game(save.name());
        }
    }
}
 
namespace
{
bool show_difficulty_dialog(load_game_metadata& load_data)
{
    std::string campaign_id = load_data.summary["campaign"];
    const game_config_view& game_config = game_config_manager::get()->game_config();
 
    if(const auto campaign = game_config.find_child("campaign", "id", campaign_id)) {
        gui2::dialogs::campaign_difficulty difficulty_dlg(*campaign);
 
        // Return if canceled, since otherwise load_data_.difficulty will be set to 'CANCEL'
        if(!difficulty_dlg.show()) {
            return false;
        }
 
        load_data.difficulty = difficulty_dlg.selected_difficulty();
        load_data.load_config["difficulty"] = load_data.difficulty;
        load_data.select_difficulty = false;
    }
 
    return true;
}
 
void copy_era(config& cfg)
{
    auto replay_start = cfg.optional_child("replay_start");
    if(!replay_start) {
        return;
    }
 
    auto era = replay_start->optional_child("era");
    if(!era) {
        return;
    }
 
    auto snapshot = cfg.optional_child("snapshot");
    if(!snapshot) {
        return;
    }
 
    snapshot->add_child("era", *era);
}
 
/** Confirms attempts to load saves from previous game versions. */
bool check_version_compatibility(const version_info& save_version)
{
    if(save_version == game_config::wesnoth_version) {
        return true;
    }
 
    const version_info& wesnoth_version = game_config::wesnoth_version;
 
    // Even minor version numbers indicate stable releases which are
    // compatible with each other.
    if(wesnoth_version.minor_version() % 2 == 0 && wesnoth_version.major_version() == save_version.major_version()
        && wesnoth_version.minor_version() == save_version.minor_version()) {
        return true;
    }
 
    // Do not load if too old. If either the savegame or the current
    // game has the version 'test', load. This 'test' version is never
    // supposed to occur, except when Soliton is testing MP servers.
    if(save_version < game_config::min_savegame_version && save_version != game_config::test_version
        && wesnoth_version != game_config::test_version) {
        const std::string message
            = _("This save is from an old, unsupported version ($version_number|) and cannot be loaded.");
        utils::string_map symbols;
        symbols["version_number"] = save_version.str();
        gui2::show_error_message(utils::interpolate_variables_into_string(message, &symbols));
        return false;
    }
 
    if(prefs::get().confirm_load_save_from_different_version()) {
        const std::string message
            = _("This save is from a different version of the game ($version_number|), and might not work with this "
                "version.\n"
                "\n"
                "<b>Warning:</b> saves in the middle of campaigns are especially likely to fail, and you should either "
                "use the old version or restart the campaign. Even when a saved game seems to load successfully, "
                "subtler aspects like gameplay balance and story progression could be impacted. The difficulty, the "
                "challenge, the <i>fun</i> may be missing.\n"
                "\n"
                "For example, the campaign may have been rebalanced with fewer enemies in the early scenarios, but "
                "expecting your recall list to have correspondingly less experience in the late scenarios.\n"
                "\n"
                "Do you wish to continue?");
        utils::string_map symbols;
        symbols["version_number"] = save_version.str();
        const int res = gui2::show_message(_("Load Game"), utils::interpolate_variables_into_string(message, &symbols),
            gui2::dialogs::message::yes_no_buttons, true);
        return res == gui2::retval::OK;
    }
 
    return true;
}
 
/** Confirms attempts to load saves from previous game versions. */
bool check_version_compatibility(const config& cfg)
{
    return check_version_compatibility(cfg["version"].str());
}
 
} // namespace
 
void load_game_metadata::read_file()
{
    try {
        load_config = read_save_file(manager->dir(), filename);
    } catch(const game::load_game_failed& e) {
        gui2::show_error_message(_("The file you have tried to load is corrupt") + "\n\n" + e.what());
        throw;
    }
 
    convert_old_saves(load_config);
}
 
void load_interactive_by_exception()
{
    if(video::headless()) {
        return;
    }
 
    if(auto load_data = load_interactive()) {
        throw load_game_exception(std::move(load_data).value());
    }
}
 
utils::optional<load_game_metadata> load_interactive()
{
    // FIXME: game_load dialog should initialize its own manager pointer
    load_game_metadata load_data{ save_index_class::default_saves_dir() };
 
    if(!gui2::dialogs::game_load::execute(load_data)) {
        return utils::nullopt;
    }
 
    load_data.show_replay |= is_replay_save(load_data.summary);
 
    try {
        load_data.read_file();
    } catch(const game::load_game_failed&) {
        return utils::nullopt;
    }
 
    if(load_data.select_difficulty) {
        if(!show_difficulty_dialog(load_data)) {
            return utils::nullopt;
        }
    }
 
    if(!check_version_compatibility(load_data.load_config)) {
        return utils::nullopt;
    }
 
    return load_data;
}
 
// TODO: reduce code duplication with load_interactive
utils::optional<load_game_metadata> load_interactive_for_multiplayer()
{
    // FIXME: game_load dialog should initialize its own manager pointer
    load_game_metadata load_data{ save_index_class::default_saves_dir() };
 
    if(!gui2::dialogs::game_load::execute(load_data)) {
        return utils::nullopt;
    }
 
    load_data.show_replay |= is_replay_save(load_data.summary);
 
    // read_save_file needs to be called before we can verify the classification so the data has
    // been populated. Since we do that, we report any errors in that process first.
    try {
        cursor::setter cur(cursor::WAIT);
        log_scope("load_game");
 
        load_data.read_file();
    } catch(const game::load_game_failed&) {
        return utils::nullopt;
    }
 
    if(is_replay_save(load_data.summary)) {
        gui2::show_transient_message(_("Load Game"), _("Replays are not supported in multiplayer mode."));
        return utils::nullopt;
    }
 
    const auto metadata = game_classification{load_data.load_config};
 
    if(!metadata.is_multiplayer()) {
        gui2::show_transient_error_message(_("This is not a multiplayer save."));
        return utils::nullopt;
    }
 
    if(!check_version_compatibility(metadata.version)) {
        return utils::nullopt;
    }
 
    copy_era(load_data.load_config);
    return load_data;
}
 
void set_gamestate(saved_game& gamestate, load_game_metadata& load_data)
{
    gamestate.set_data(std::exchange(load_data.load_config, {}));
    gamestate.unify_controllers();
}
 
savegame::savegame(saved_game& gamestate, const compression::format compress_saves, const std::string& title)
    : filename_()
    , title_(title)
    , save_index_manager_(save_index_class::default_saves_dir())
    , gamestate_(gamestate)
    , error_message_(_("The game could not be saved: "))
    , show_confirmation_(false)
    , compress_saves_(compress_saves)
{
}
 
bool savegame::save_game_automatic(bool ask_for_overwrite, const std::string& filename)
{
    if(filename.empty()) {
        filename_ = create_filename();
    } else {
        filename_ = filename;
    }
 
    if(ask_for_overwrite) {
        if(!check_overwrite()) {
            return save_game_interactive("", savegame::OK_CANCEL);
        }
    }
 
    return save_game();
}
 
bool savegame::save_game_interactive(const std::string& message, DIALOG_TYPE dialog_type)
{
    show_confirmation_ = true;
    filename_ = create_filename();
 
    const int res = show_save_dialog(message, dialog_type);
 
    if(res == 2) {
        throw_quit_game_exception(); // Quit game
    }
 
    if(res == gui2::retval::OK && check_overwrite()) {
        return save_game();
    }
 
    return false;
}
 
int savegame::show_save_dialog(const std::string& message, DIALOG_TYPE dialog_type)
{
    int res = 0;
 
    if(dialog_type == OK_CANCEL) {
        gui2::dialogs::game_save dlg(filename_, title_);
        dlg.show();
        res = dlg.get_retval();
    } else if(dialog_type == YES_NO) {
        gui2::dialogs::game_save_message dlg(filename_, title_, message);
        dlg.show();
        res = dlg.get_retval();
    }
 
    if(!check_filename(filename_)) {
        res = gui2::retval::CANCEL;
    }
 
    return res;
}
 
bool savegame::check_overwrite()
{
    if(!save_game_exists(filename_, compress_saves_)) {
        return true;
    }
 
    std::ostringstream message;
    message << _("Save already exists. Do you want to overwrite it?") << "\n" << _("Name: ") << filename_;
    const int res = gui2::show_message(_("Overwrite?"), message.str(), gui2::dialogs::message::yes_no_buttons);
    return res == gui2::retval::OK;
}
 
bool savegame::check_filename(const std::string& filename)
{
    if(filesystem::is_compressed_file(filename)) {
        gui2::show_error_message(_("Save names should not end with ‘.gz’ or ‘.bz2’. Please remove the extension."));
        return false;
    } else if(!filesystem::is_legal_user_file_name(filename)) {
        // This message is not all-inclusive. This is on purpose. Few people
        // need to know about DOS device names or the 255 character limit.
        gui2::show_error_message(_("Save names may not end with a dot, or contain two dots or any of the following characters:\n    \" * / : < > ? \\ | ~"));
        return false;
    }
 
    return true;
}
 
std::string savegame::create_filename(unsigned int turn_number) const
{
    return create_initial_filename(turn_number);
}
 
void savegame::before_save()
{
}
 
bool savegame::save_game(const std::string& filename)
{
    try {
        utils::optional<const utils::ms_optimer> timer([this](const auto& timer) {
            LOG_SAVE << "Milliseconds to save " << filename_ << ": " << timer;
        });
 
        if(filename_.empty()) {
            filename_ = filename;
        }
 
        before_save();
 
        write_game_to_disk(filename_);
        if(resources::persist != nullptr) {
            resources::persist->end_transaction();
            resources::persist->start_transaction();
        }
 
        // Create an entry in the save_index. Doing this here ensures all leader image paths
        // sre expanded in a context-independent fashion and can appear in the Load Game dialog
        // even if a campaign-specific sprite is used. This is because the image's full path is
        // only available if the binary-path context its a part of is loaded. Without this, if
        // a player saves a game and exits the game or reloads the cache, the leader image will
        // only be available within that specific binary context (when playing another game from
        // the came campaign, for example).
        save_index_manager_->rebuild(filename_);
 
        // Log time before showing the confirmation
        timer.reset();
 
        if(show_confirmation_) {
            gui2::show_transient_message(_("Saved"), _("The game has been saved."));
        }
 
        return true;
    } catch(const game::save_game_failed& e) {
        ERR_SAVE << error_message_ << e.message;
        gui2::show_error_message(error_message_ + e.message);
 
        // do not bother retrying, since the user can just try to save the game again
        // maybe show a yes-no dialog for "disable autosaves now"?
        return false;
    };
}
 
void savegame::write_game_to_disk(const std::string& filename)
{
    LOG_SAVE << "savegame::save_game";
 
    filename_ = filename;
    filename_ += compression::format_extension(compress_saves_);
 
    std::stringstream ss;
    {
        config_writer out(ss, compress_saves_);
        write_game(out);
        finish_save_game(out);
    }
 
    filesystem::scoped_ostream os(open_save_game(filename_));
    (*os) << ss.str();
 
    if(!os->good()) {
        throw game::save_game_failed(_("Could not write to file"));
    }
}
 
void savegame::write_game(config_writer& out)
{
    log_scope("write_game");
 
    out.write_key_val("version", game_config::wesnoth_version.str());
 
    gamestate_.write_general_info(out);
}
 
void savegame::finish_save_game(const config_writer& out)
{
    try {
        if(!out.good()) {
            throw game::save_game_failed(_("Could not write to file"));
        }
    } catch(const filesystem::io_exception& e) {
        throw game::save_game_failed(e.what());
    }
}
 
// Throws game::save_game_failed
filesystem::scoped_ostream savegame::open_save_game(const std::string& label)
{
    try {
        return filesystem::ostream_file(save_index_manager_->dir() + "/" + label);
    } catch(const filesystem::io_exception& e) {
        throw game::save_game_failed(e.what());
    }
}
 
scenariostart_savegame::scenariostart_savegame(saved_game& gamestate, const compression::format compress_saves)
    : savegame(gamestate, compress_saves)
{
    filename_ = create_filename();
}
 
std::string scenariostart_savegame::create_initial_filename(unsigned int) const
{
    return gamestate().classification().label;
}
 
void scenariostart_savegame::write_game(config_writer& out)
{
    savegame::write_game(out);
    gamestate().write_carryover(out);
}
 
replay_savegame::replay_savegame(saved_game& gamestate, const compression::format compress_saves)
    : savegame(gamestate, compress_saves, _("Save Replay"))
{
}
 
std::string replay_savegame::create_initial_filename(unsigned int) const
{
    auto time = chrono::format_local_timestamp(std::chrono::system_clock::now(), "%Y%m%d-%H%M%S");
    // TRANSLATORS: This string is used as part of a filename, as in, "HttT-The Elves Besieged replay.gz"
    return formatter() << gamestate().classification().label << " " << _("replay") << " " << time;
}
 
void replay_savegame::write_game(config_writer& out)
{
    savegame::write_game(out);
 
    gamestate().write_carryover(out);
    out.write_child("replay_start", gamestate().replay_start());
 
    out.open_child("replay");
    gamestate().get_replay().write(out);
    out.close_child("replay");
}
 
autosave_savegame::autosave_savegame(saved_game& gamestate, const compression::format compress_saves)
    : ingame_savegame(gamestate, compress_saves)
{
    set_error_message(_("Could not auto save the game. Please save the game manually."));
}
 
void autosave_savegame::autosave(const bool disable_autosave, const int autosave_max, const int infinite_autosaves)
{
    if(disable_autosave)
        return;
 
    save_game_automatic();
 
    auto manager = save_index_class::default_saves_dir();
    manager->delete_old_auto_saves(autosave_max, infinite_autosaves);
}
 
std::string autosave_savegame::create_initial_filename(unsigned int turn_number) const
{
    std::string filename;
    if(gamestate().classification().label.empty()) {
        filename = _("Auto-Save");
    } else {
        filename = gamestate().classification().label + "-" + _("Auto-Save") + std::to_string(turn_number);
    }
 
    return filename;
}
 
oos_savegame::oos_savegame(saved_game& gamestate, bool& ignore)
    : ingame_savegame(gamestate, prefs::get().save_compression_format())
    , ignore_(ignore)
{
}
 
int oos_savegame::show_save_dialog(const std::string& message, DIALOG_TYPE /*dialog_type*/)
{
    int res = 0;
 
    if(!ignore_) {
        gui2::dialogs::game_save_oos dlg(ignore_, filename_, title(), message);
        dlg.show();
        res = dlg.get_retval();
    }
 
    if(!check_filename(filename_)) {
        res = gui2::retval::CANCEL;
    }
 
    return res;
}
 
ingame_savegame::ingame_savegame(saved_game& gamestate, const compression::format compress_saves)
    : savegame(gamestate, compress_saves, _("Save Game"))
{
}
 
std::string ingame_savegame::create_initial_filename(unsigned int turn_number) const
{
    return formatter() << gamestate().classification().label << " " << _("Turn") << " " << turn_number;
}
 
void ingame_savegame::write_game(config_writer& out)
{
    log_scope("write_game");
 
    if(!gamestate().get_starting_point().validate_wml()) {
        throw game::save_game_failed(_("Game state is corrupted"));
    }
 
    savegame::write_game(out);
 
    gamestate().write_carryover(out);
    out.write_child("snapshot", gamestate().get_starting_point());
    out.write_child("replay_start", gamestate().replay_start());
    out.open_child("replay");
    gamestate().get_replay().write(out);
    out.close_child("replay");
}
 
// changes done during 1.11.0-dev
static void convert_old_saves_1_11_0(config& cfg)
{
    if(!cfg.has_child("snapshot")) {
        return;
    }
 
    const config& snapshot = cfg.mandatory_child("snapshot");
    const config& replay_start = cfg.mandatory_child("replay_start");
    const config& replay = cfg.mandatory_child("replay");
 
    if(!cfg.has_child("carryover_sides") && !cfg.has_child("carryover_sides_start")) {
        config carryover;
        // copy rng and menu items from toplevel to new carryover_sides
        carryover["random_seed"] = cfg["random_seed"];
        carryover["random_calls"] = cfg["random_calls"];
 
        for(const config& menu_item : cfg.child_range("menu_item")) {
            carryover.add_child("menu_item", menu_item);
        }
 
        carryover["difficulty"] = cfg["difficulty"];
        carryover["random_mode"] = cfg["random_mode"];
        // the scenario to be played is always stored as next_scenario in carryover_sides_start
        carryover["next_scenario"] = cfg["scenario"];
 
        config carryover_start = carryover;
 
        // copy sides from either snapshot or replay_start to new carryover_sides
        if(!snapshot.empty()) {
            for(const config& side : snapshot.child_range("side")) {
                carryover.add_child("side", side);
            }
            // for compatibility with old savegames that use player instead of side
            for(const config& side : snapshot.child_range("player")) {
                carryover.add_child("side", side);
            }
            // save the sides from replay_start in carryover_sides_start
            for(const config& side : replay_start.child_range("side")) {
                carryover_start.add_child("side", side);
            }
            // for compatibility with old savegames that use player instead of side
            for(const config& side : replay_start.child_range("player")) {
                carryover_start.add_child("side", side);
            }
        } else if(!replay_start.empty()) {
            for(const config& side : replay_start.child_range("side")) {
                carryover.add_child("side", side);
                carryover_start.add_child("side", side);
            }
            // for compatibility with old savegames that use player instead of side
            for(const config& side : replay_start.child_range("player")) {
                carryover.add_child("side", side);
                carryover_start.add_child("side", side);
            }
        }
 
        // get variables according to old hierarchy and copy them to new carryover_sides
        if(!snapshot.empty()) {
            if(auto variables_from_snapshot = snapshot.optional_child("variables")) {
                carryover.add_child("variables", *variables_from_snapshot);
                carryover_start.add_child("variables", replay_start.child_or_empty("variables"));
            } else if(auto variables_from_cfg = cfg.optional_child("variables")) {
                carryover.add_child("variables", *variables_from_cfg);
                carryover_start.add_child("variables", *variables_from_cfg);
            }
        } else if(!replay_start.empty()) {
            if(auto variables = replay_start.optional_child("variables")) {
                carryover.add_child("variables", *variables);
                carryover_start.add_child("variables", *variables);
            }
        } else {
            carryover.add_child("variables", cfg.mandatory_child("variables"));
            carryover_start.add_child("variables", cfg.mandatory_child("variables"));
        }
 
        cfg.add_child("carryover_sides", carryover);
        cfg.add_child("carryover_sides_start", carryover_start);
    }
 
    // if replay and snapshot are empty we've got a start of scenario save and don't want replay_start either
    if(replay.empty() && snapshot.empty()) {
        LOG_RG << "removing replay_start";
        cfg.clear_children("replay_start");
    }
 
    // remove empty replay or snapshot so type of save can be detected more easily
    if(replay.empty()) {
        LOG_RG << "removing replay";
        cfg.clear_children("replay");
    }
 
    if(snapshot.empty()) {
        LOG_RG << "removing snapshot";
        cfg.clear_children("snapshot");
    }
}
// changes done during 1.13.0-dev
static void convert_old_saves_1_13_0(config& cfg)
{
    if(auto carryover_sides_start = cfg.optional_child("carryover_sides_start")) {
        if(!carryover_sides_start->has_attribute("next_underlying_unit_id")) {
            carryover_sides_start["next_underlying_unit_id"] = cfg["next_underlying_unit_id"];
        }
    }
 
    if(cfg.child_or_empty("snapshot").empty()) {
        cfg.clear_children("snapshot");
    }
 
    if(cfg.child_or_empty("replay_start").empty()) {
        cfg.clear_children("replay_start");
    }
 
    if(auto snapshot = cfg.optional_child("snapshot")) {
        // make [end_level] -> [end_level_data] since its alo called [end_level_data] in the carryover.
        if(auto end_level = cfg.optional_child("end_level")) {
            snapshot->add_child("end_level_data", *end_level);
            snapshot->clear_children("end_level");
        }
        // if we have a snapshot then we already applied carryover so there is no reason to keep this data.
        if(cfg.has_child("carryover_sides_start")) {
            cfg.clear_children("carryover_sides_start");
        }
    }
 
    if(!cfg.has_child("snapshot") && !cfg.has_child("replay_start")) {
        cfg.clear_children("carryover_sides");
    }
 
    // This code is needed because for example otherwise it won't find the (empty) era
    if(!cfg.has_child("multiplayer")) {
        cfg.add_child("multiplayer",
            config{
                "mp_era",
                "era_blank",
                "mp_use_map_settings",
                true,
            });
    }
}
 
// changes done during 1.13.0+dev
static void convert_old_saves_1_13_1(config& cfg)
{
    if(auto multiplayer = cfg.optional_child("multiplayer")) {
        if(multiplayer["mp_era"] == "era_blank") {
            multiplayer["mp_era"] = "era_default";
        }
    }
 
    // This currently only fixes start-of-scenario saves.
    if(auto carryover_sides_start = cfg.optional_child("carryover_sides_start")) {
        for(config& side : carryover_sides_start->child_range("side")) {
            for(config& unit : side.child_range("unit")) {
                if(auto modifications = unit.optional_child("modifications")) {
                    for(config& advancement : modifications->child_range("advance")) {
                        modifications->add_child("advancement", advancement);
                    }
                    modifications->clear_children("advance");
                }
            }
        }
    }
 
    for(config& snapshot : cfg.child_range("snapshot")) {
        if(snapshot.has_attribute("used_items")) {
            config used_items;
            for(const std::string& item : utils::split(snapshot["used_items"])) {
                used_items[item] = true;
            }
 
            snapshot.remove_attribute("used_items");
            snapshot.add_child("used_items", used_items);
        }
    }
}
 
// changes done during 1.15.3+dev
static void convert_old_saves_1_15_3(config& cfg)
{
    if(cfg["era_id"].empty()) {
        cfg["era_id"] = cfg.child_or_empty("multiplayer")["mp_era"];
    }
 
    if(cfg["active_mods"].empty()) {
        cfg["active_mods"] = cfg.child_or_empty("multiplayer")["active_mods"];
    }
}
 
void convert_old_saves(config& cfg)
{
    version_info loaded_version(cfg["version"]);
    if(loaded_version < version_info("1.12.0")) {
        convert_old_saves_1_11_0(cfg);
    }
 
    // '<= version_info("1.13.0")' doesn't work
    // because version_info cannot handle 1.13.0-dev versions correctly.
    if(loaded_version < version_info("1.13.1")) {
        convert_old_saves_1_13_0(cfg);
    }
 
    if(loaded_version <= version_info("1.13.1")) {
        convert_old_saves_1_13_1(cfg);
    }
 
    if(loaded_version < version_info("1.15.4")) {
        convert_old_saves_1_15_3(cfg);
    }
 
    LOG_RG << "cfg after conversion " << cfg;
}
 
} // namespace savegame