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/* 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.
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give
* you permission to link this library with independent modules to
* produce an executable, regardless of the license terms of these
* independent modules, and to copy and distribute the resulting
* executable under terms of your choice, provided that you also meet,
* for each linked independent module, the terms and conditions of the
* license of that module. An independent module is a module which is
* not derived from or based on this library. If you modify this
* library, you may extend this exception to your version of the
* library, but you are not obliged to do so. If you do not wish to do
* so, delete this exception statement from your version.
*
* 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 2012-2021 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.
*/
package org.projecttick;
import org.projecttick.modern.ModernLauncher;
import org.projecttick.onesix.OneSixLauncher;
import java.io.*;
import java.nio.charset.Charset;
public class EntryPoint
{
private enum Action
{
Proceed,
Launch,
Abort
}
public static void main(String[] args)
{
EntryPoint listener = new EntryPoint();
int retCode = listener.listen();
if (retCode != 0)
{
System.out.println("Exiting with " + retCode);
System.exit(retCode);
}
}
private Action parseLine(String inData) throws ParseException
{
String[] pair = inData.split(" ", 2);
if(pair.length == 1)
{
String command = pair[0];
if (pair[0].equals("launch"))
return Action.Launch;
else if (pair[0].equals("abort"))
return Action.Abort;
else throw new ParseException("Error while parsing:" + pair[0]);
}
if(pair.length != 2)
throw new ParseException("Pair length is not 2.");
String command = pair[0];
String param = pair[1];
if(command.equals("launcher"))
{
if(param.equals("onesix"))
{
m_launcher = new OneSixLauncher();
Utils.log("Using onesix launcher.");
Utils.log();
return Action.Proceed;
}
else if(param.equals("modern"))
{
m_launcher = new ModernLauncher();
Utils.log("Using modern launcher (subprocess mode).");
Utils.log();
return Action.Proceed;
}
else
throw new ParseException("Invalid launcher type: " + param);
}
m_params.add(command, param);
//System.out.println(command + " : " + param);
return Action.Proceed;
}
public int listen()
{
BufferedReader buffer;
try
{
buffer = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
} catch (UnsupportedEncodingException e)
{
System.err.println("For some reason, your java does not support UTF-8. Consider living in the current century.");
e.printStackTrace();
return 1;
}
boolean isListening = true;
boolean isAborted = false;
// Main loop
while (isListening)
{
String inData;
try
{
// Read from the pipe one line at a time
inData = buffer.readLine();
if (inData != null)
{
Action a = parseLine(inData);
if(a == Action.Abort)
{
isListening = false;
isAborted = true;
}
if(a == Action.Launch)
{
isListening = false;
}
}
else
{
isListening = false;
isAborted = true;
}
}
catch (IOException e)
{
System.err.println("MeshMC ABORT due to IO exception:");
e.printStackTrace();
return 1;
}
catch (ParseException e)
{
System.err.println("MeshMC ABORT due to PARSE exception:");
e.printStackTrace();
return 1;
}
}
if(isAborted)
{
System.err.println("Launch aborted by MeshMC.");
return 1;
}
if(m_launcher != null)
{
return m_launcher.launch(m_params);
}
System.err.println("No valid launcher implementation specified.");
return 1;
}
private ParamBucket m_params = new ParamBucket();
private org.projecttick.MeshMC m_launcher;
}
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