fabric-loader for nukkit

NukkitGameProvider.java

/*
 * Copyright 2016 FabricMC
 *
 * 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 net.fabricmc.loader.game;

import net.fabricmc.api.EnvType;
import net.fabricmc.loader.launch.common.FabricLauncherBase;
import net.fabricmc.loader.util.Arguments;

import java.io.File;
import java.lang.reflect.Method;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class NukkitGameProvider implements GameProvider {
	static class VersionData {
		public String id;
		public String name;
	}
	private String entrypoint;
	private Arguments arguments;
	private Path gameJar;
	private VersionData versionData;

	@Override
	public String getGameId() {
		if (versionData != null) {
			String id = versionData.id;
			if (id == null) {
				id = versionData.name;
			}

			if (id != null) {
				return "nukkit-" + id.replaceAll("[^a-zA-Z0-9.]+", "-");
			}
		}

		String filename = gameJar.getFileName().toString();
		if (filename.lastIndexOf('-') >= 0) {
			filename = filename.substring(0, filename.lastIndexOf('-'));
		}

		return "nukkit-" + filename;
	}

	@Override
	public String getGameName() {
		if (versionData != null && versionData.name != null) {
			return "Nukkit " + versionData.name;
		}

		return "Nukkit";
	}

	@Override
	public String getEntrypoint() {
		return entrypoint;
	}

	@Override
	public Path getLaunchDirectory() {
		if (arguments == null) {
			return new File(".").toPath();
		}

		return FabricLauncherBase.getLaunchDirectory(arguments).toPath();
	}

	@Override
	public boolean isObfuscated() {
		return false;
	}

	@Override
	public boolean requiresUrlClassLoader() {
		return false;
	}

	@Override
	public List<Path> getGameContextJars() {
		List<Path> list = new ArrayList<>();
		list.add(gameJar);
		return list;
	}

	@Override
	public boolean locateGame(EnvType envType, ClassLoader loader) {
		List<String> entrypointClasses = new ArrayList<>();
		entrypointClasses.add("cn.nukkit.Nukkit");
		Optional<GameProviderHelper.EntrypointResult> entrypointResult = GameProviderHelper.findFirstClass(loader, entrypointClasses);
		if (!entrypointResult.isPresent()) {
			return false;
		}

		entrypoint = entrypointResult.get().entrypointName;
		gameJar = entrypointResult.get().entrypointPath;
//		realmsJar = GameProviderHelper.getSource(loader, "realmsVersion").orElse(null);
		//hasModLoader = GameProviderHelper.getSource(loader, "ModLoader.class").isPresent();

		versionData = null;
		return true;
	}
	@Override
	public void acceptArguments(String... argStrs) {
		this.arguments = new Arguments();
		arguments.parse(argStrs);
		//todo impl
		//FabricLauncherBase.processArgumentMap(arguments, EnvType.SERVER);
	}

	@Override
	public void launch(ClassLoader loader) {
		String targetClass = entrypoint;

		try {
			Class<?> c = ((ClassLoader) loader).loadClass(targetClass);
			Method m = c.getMethod("main", String[].class);
			m.invoke(null, (Object) arguments.toArray());
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
}

setup.txt

this is here in case anybody wants to actually modify the entire toolchain (unlikely) to support a underused server software
- add the gameprovider
- register it
- compile
- download the fabric-installer
- run the installer to get fabric-server-launch.jar
- copy the contents of the compiled fabric-loader.jar inside fabric-server-loader.jar
- delete the ASM package from nukkit
- add apache commons io to the fabric-server-loader.jar
- run fabric-server-loader.jar
- ???
-profit