Add 'meshmc/' from commit 'fad6a1066616b69d7f5fef01178efdf014c59537'

git-subtree-dir: meshmc
git-subtree-mainline: 934382c8a1ce738589dee9ee0f14e1cec812770e
git-subtree-split: fad6a1066616b69d7f5fef01178efdf014c59537

1 files changed, 270 insertions, 0 deletions

diff --git a/meshmc/launcher/minecraft/legacy/LegacyInstance.cpp b/meshmc/launcher/minecraft/legacy/LegacyInstance.cpp
new file mode 100644
index 0000000000..c010974481
--- /dev/null
+++ b/meshmc/launcher/minecraft/legacy/LegacyInstance.cpp
@@ -0,0 +1,270 @@
+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   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 <https://www.gnu.org/licenses/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <QFileInfo>
+#include <minecraft/launch/MeshMCPartLaunch.h>
+#include <QDir>
+#include <settings/Setting.h>
+
+#include "LegacyInstance.h"
+
+#include "minecraft/legacy/LegacyModList.h"
+#include "minecraft/WorldList.h"
+#include <MMCZip.h>
+#include <FileSystem.h>
+
+LegacyInstance::LegacyInstance(SettingsObjectPtr globalSettings,
+							   SettingsObjectPtr settings,
+							   const QString& rootDir)
+	: BaseInstance(globalSettings, settings, rootDir)
+{
+	settings->registerSetting("NeedsRebuild", true);
+	settings->registerSetting("ShouldUpdate", false);
+	settings->registerSetting("JarVersion", QString());
+	settings->registerSetting("IntendedJarVersion", QString());
+	/*
+	 * custom base jar has no default. it is determined in code... see the
+	 * accessor methods for it
+	 *
+	 * for instances that DO NOT have the CustomBaseJar setting (legacy
+	 * instances),
+	 * [.]minecraft/bin/mcbackup.jar is the default base jar
+	 */
+	settings->registerSetting("UseCustomBaseJar", true);
+	settings->registerSetting("CustomBaseJar", "");
+}
+
+QString LegacyInstance::mainJarToPreserve() const
+{
+	bool customJar = m_settings->get("UseCustomBaseJar").toBool();
+	if (customJar) {
+		auto base = baseJar();
+		if (QFile::exists(base)) {
+			return base;
+		}
+	}
+	auto runnable = runnableJar();
+	if (QFile::exists(runnable)) {
+		return runnable;
+	}
+	return QString();
+}
+
+QString LegacyInstance::baseJar() const
+{
+	bool customJar = m_settings->get("UseCustomBaseJar").toBool();
+	if (customJar) {
+		return customBaseJar();
+	} else
+		return defaultBaseJar();
+}
+
+QString LegacyInstance::customBaseJar() const
+{
+	QString value = m_settings->get("CustomBaseJar").toString();
+	if (value.isNull() || value.isEmpty()) {
+		return defaultCustomBaseJar();
+	}
+	return value;
+}
+
+bool LegacyInstance::shouldUseCustomBaseJar() const
+{
+	return m_settings->get("UseCustomBaseJar").toBool();
+}
+
+Task::Ptr LegacyInstance::createUpdateTask(Net::Mode)
+{
+	return nullptr;
+}
+
+std::shared_ptr<LegacyModList> LegacyInstance::jarModList() const
+{
+	if (!jar_mod_list) {
+		auto list = new LegacyModList(jarModsDir(), modListFile());
+		jar_mod_list.reset(list);
+	}
+	jar_mod_list->update();
+	return jar_mod_list;
+}
+
+QString LegacyInstance::gameRoot() const
+{
+	QFileInfo mcDir(FS::PathCombine(instanceRoot(), "minecraft"));
+	QFileInfo dotMCDir(FS::PathCombine(instanceRoot(), ".minecraft"));
+
+	if (mcDir.exists() && !dotMCDir.exists())
+		return mcDir.filePath();
+	else
+		return dotMCDir.filePath();
+}
+
+QString LegacyInstance::binRoot() const
+{
+	return FS::PathCombine(gameRoot(), "bin");
+}
+
+QString LegacyInstance::modsRoot() const
+{
+	return FS::PathCombine(gameRoot(), "mods");
+}
+
+QString LegacyInstance::jarModsDir() const
+{
+	return FS::PathCombine(instanceRoot(), "instMods");
+}
+
+QString LegacyInstance::libDir() const
+{
+	return FS::PathCombine(gameRoot(), "lib");
+}
+
+QString LegacyInstance::savesDir() const
+{
+	return FS::PathCombine(gameRoot(), "saves");
+}
+
+QString LegacyInstance::coreModsDir() const
+{
+	return FS::PathCombine(gameRoot(), "coremods");
+}
+
+QString LegacyInstance::resourceDir() const
+{
+	return FS::PathCombine(gameRoot(), "resources");
+}
+QString LegacyInstance::texturePacksDir() const
+{
+	return FS::PathCombine(gameRoot(), "texturepacks");
+}
+
+QString LegacyInstance::runnableJar() const
+{
+	return FS::PathCombine(binRoot(), "minecraft.jar");
+}
+
+QString LegacyInstance::modListFile() const
+{
+	return FS::PathCombine(instanceRoot(), "modlist");
+}
+
+QString LegacyInstance::instanceConfigFolder() const
+{
+	return FS::PathCombine(gameRoot(), "config");
+}
+
+bool LegacyInstance::shouldRebuild() const
+{
+	return m_settings->get("NeedsRebuild").toBool();
+}
+
+QString LegacyInstance::currentVersionId() const
+{
+	return m_settings->get("JarVersion").toString();
+}
+
+QString LegacyInstance::intendedVersionId() const
+{
+	return m_settings->get("IntendedJarVersion").toString();
+}
+
+bool LegacyInstance::shouldUpdate() const
+{
+	QVariant var = settings()->get("ShouldUpdate");
+	if (!var.isValid() || var.toBool() == false) {
+		return intendedVersionId() != currentVersionId();
+	}
+	return true;
+}
+
+QString LegacyInstance::defaultBaseJar() const
+{
+	return "versions/" + intendedVersionId() + "/" + intendedVersionId() +
+		   ".jar";
+}
+
+QString LegacyInstance::defaultCustomBaseJar() const
+{
+	return FS::PathCombine(binRoot(), "mcbackup.jar");
+}
+
+std::shared_ptr<WorldList> LegacyInstance::worldList() const
+{
+	if (!m_world_list) {
+		m_world_list.reset(new WorldList(savesDir()));
+	}
+	return m_world_list;
+}
+
+QString LegacyInstance::typeName() const
+{
+	return tr("Legacy");
+}
+
+QString LegacyInstance::getStatusbarDescription()
+{
+	return tr("Instance from previous versions.");
+}
+
+QStringList
+LegacyInstance::verboseDescription(AuthSessionPtr session,
+								   MinecraftServerTargetPtr serverToJoin)
+{
+	QStringList out;
+
+	auto alltraits = traits();
+	if (alltraits.size()) {
+		out << "Traits:";
+		for (auto trait : alltraits) {
+			out << "  " + trait;
+		}
+		out << "";
+	}
+
+	QString windowParams;
+	if (settings()->get("LaunchMaximized").toBool()) {
+		out << "Window size: max (if available)";
+	} else {
+		auto width = settings()->get("MinecraftWinWidth").toInt();
+		auto height = settings()->get("MinecraftWinHeight").toInt();
+		out << "Window size: " + QString::number(width) + " x " +
+				   QString::number(height);
+	}
+	out << "";
+	return out;
+}