1 files changed, 104 insertions, 0 deletions
diff --git a/meshmc/launcher/launch/steps/PreLaunchCommand.cpp b/meshmc/launcher/launch/steps/PreLaunchCommand.cpp
new file mode 100644
index 0000000000..fdaf2c0fbf
--- /dev/null
+++ b/meshmc/launcher/launch/steps/PreLaunchCommand.cpp
@@ -0,0 +1,104 @@
+/* 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 "PreLaunchCommand.h"
+#include <launch/LaunchTask.h>
+
+PreLaunchCommand::PreLaunchCommand(LaunchTask* parent) : LaunchStep(parent)
+{
+	auto instance = m_parent->instance();
+	m_command = instance->getPreLaunchCommand();
+	m_process.setProcessEnvironment(instance->createEnvironment());
+	connect(&m_process, &LoggedProcess::log, this, &PreLaunchCommand::logLines);
+	connect(&m_process, &LoggedProcess::stateChanged, this,
+			&PreLaunchCommand::on_state);
+}
+
+void PreLaunchCommand::executeTask()
+{
+	// FIXME: where to put this?
+	QString prelaunch_cmd = m_parent->substituteVariables(m_command);
+	emit logLine(tr("Running Pre-Launch command: %1").arg(prelaunch_cmd),
+				 MessageLevel::MeshMC);
+	m_process.start(prelaunch_cmd);
+}
+
+void PreLaunchCommand::on_state(LoggedProcess::State state)
+{
+	auto getError = [&]() {
+		return tr("Pre-Launch command failed with code %1.\n\n")
+			.arg(m_process.exitCode());
+	};
+	switch (state) {
+		case LoggedProcess::Aborted:
+		case LoggedProcess::Crashed:
+		case LoggedProcess::FailedToStart: {
+			auto error = getError();
+			emit logLine(error, MessageLevel::Fatal);
+			emitFailed(error);
+			return;
+		}
+		case LoggedProcess::Finished: {
+			if (m_process.exitCode() != 0) {
+				auto error = getError();
+				emit logLine(error, MessageLevel::Fatal);
+				emitFailed(error);
+			} else {
+				emit logLine(tr("Pre-Launch command ran successfully.\n\n"),
+							 MessageLevel::MeshMC);
+				emitSucceeded();
+			}
+		}
+		default:
+			break;
+	}
+}
+
+void PreLaunchCommand::setWorkingDirectory(const QString& wd)
+{
+	m_process.setWorkingDirectory(wd);
+}
+
+bool PreLaunchCommand::abort()
+{
+	auto state = m_process.state();
+	if (state == LoggedProcess::Running || state == LoggedProcess::Starting) {
+		m_process.kill();
+	}
+	return true;
+}