Use Dev Launch Injector to ensure that the launch options are always kept upto date. (#138)

* Generate pre-launch classes to set the run args and system property's
Will remove the need to regen the run configs each time the game is updated

* fix minor thing.

* Small cleanup

* Another small rename + remove testing code

* Remove import

* Add basic auto upgrade path, put the launch classes in a package

* Suggested cleanups

* Use dev-launch-wrapper

* Remove old classes

* Rename to dev-launch-injector

* Update more things I forgot about

src/main/java/net/fabricmc/loom/AbstractPlugin.java

@@ -53,6 +53,7 @@ import org.gradle.api.tasks.scala.ScalaCompile;
 import org.gradle.plugins.ide.eclipse.model.EclipseModel;
 import org.gradle.plugins.ide.idea.model.IdeaModel;
 
+import net.fabricmc.loom.providers.LaunchProvider;
 import net.fabricmc.loom.providers.MappingsProvider;
 import net.fabricmc.loom.providers.MinecraftProvider;
 import net.fabricmc.loom.task.RemapJarTask;
@@ -278,6 +279,7 @@ public class AbstractPlugin implements Plugin<Project> {
 
 			dependencyManager.addProvider(new MinecraftProvider());
 			dependencyManager.addProvider(new MappingsProvider());
+			dependencyManager.addProvider(new LaunchProvider());
 
 			dependencyManager.handleDependencies(project1);
 

src/main/java/net/fabricmc/loom/LoomGradleExtension.java

@@ -179,6 +179,10 @@ public class LoomGradleExtension {
 		return natives;
 	}
 
+	public File getDevLauncherConfig() {
+		return new File(getRootProjectPersistentCache(), "launch.cfg");
+	}
+
 	@Nullable
 	private static Dependency findDependency(Project p, Collection<Configuration> configs, BiPredicate<String, String> groupNameFilter) {
 		for (Configuration config : configs) {

src/main/java/net/fabricmc/loom/providers/LaunchProvider.java

@@ -0,0 +1,105 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.providers;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.StringJoiner;
+import java.util.function.Consumer;
+
+import org.apache.commons.io.FileUtils;
+import org.gradle.api.Project;
+
+import net.fabricmc.loom.LoomGradleExtension;
+import net.fabricmc.loom.util.Constants;
+import net.fabricmc.loom.util.DependencyProvider;
+
+public class LaunchProvider extends DependencyProvider {
+	@Override
+	public void provide(DependencyInfo dependency, Project project, LoomGradleExtension extension, Consumer<Runnable> postPopulationScheduler) throws IOException {
+		final LaunchConfig launchConfig = new LaunchConfig()
+				.property("fabric.development", "true")
+
+				.property("client", "java.library.path", extension.getNativesDirectory().getAbsolutePath())
+				.property("client", "org.lwjgl.librarypath", extension.getNativesDirectory().getAbsolutePath())
+
+				.argument("client", "--assetIndex")
+				.argument("client", extension.getMinecraftProvider().versionInfo.assetIndex.getFabricId(extension.getMinecraftProvider().minecraftVersion))
+				.argument("client", "--assetsDir")
+				.argument("client", new File(extension.getUserCache(), "assets").getAbsolutePath());
+
+		FileUtils.writeStringToFile(extension.getDevLauncherConfig(), launchConfig.asString(), StandardCharsets.UTF_8);
+
+		addDependency("net.fabricmc:dev-launch-injector:" + Constants.DEV_LAUNCH_INJECTOR_VERSION, project, "runtimeOnly");
+	}
+
+	@Override
+	public String getTargetConfig() {
+		return Constants.MINECRAFT_NAMED;
+	}
+
+	public static class LaunchConfig {
+		private final Map<String, List<String>> values = new HashMap<>();
+
+		public LaunchConfig property(String key, String value) {
+			return property("common", key, value);
+		}
+
+		public LaunchConfig property(String side, String key, String value) {
+			values.computeIfAbsent(side + "Properties", (s -> new ArrayList<>()))
+					.add(String.format("%s=%s", key, value));
+			return this;
+		}
+
+		public LaunchConfig argument(String value) {
+			return argument("common", value);
+		}
+
+		public LaunchConfig argument(String side, String value) {
+			values.computeIfAbsent(side + "Args", (s -> new ArrayList<>()))
+					.add(value);
+			return this;
+		}
+
+		public String asString() {
+			StringJoiner stringJoiner = new StringJoiner("\n");
+
+			for (Map.Entry<String, List<String>> entry : values.entrySet()) {
+				stringJoiner.add(entry.getKey());
+
+				for (String s : entry.getValue()) {
+					stringJoiner.add("\t" + s);
+				}
+			}
+
+			return stringJoiner.toString();
+		}
+	}
+}

src/main/java/net/fabricmc/loom/task/GenEclipseRunsTask.java

@@ -43,11 +43,11 @@ public class GenEclipseRunsTask extends AbstractLoomTask {
 		String clientRunConfig = RunConfig.clientRunConfig(getProject()).fromDummy("eclipse_run_config_template.xml");
 		String serverRunConfig = RunConfig.serverRunConfig(getProject()).fromDummy("eclipse_run_config_template.xml");
 
-		if (!clientRunConfigs.exists()) {
+		if (!clientRunConfigs.exists() || RunConfig.needsUpgrade(clientRunConfigs)) {
 			FileUtils.writeStringToFile(clientRunConfigs, clientRunConfig, StandardCharsets.UTF_8);
 		}
 
-		if (!serverRunConfigs.exists()) {
+		if (!serverRunConfigs.exists() || RunConfig.needsUpgrade(serverRunConfigs)) {
 			FileUtils.writeStringToFile(serverRunConfigs, serverRunConfig, StandardCharsets.UTF_8);
 		}
 

src/main/java/net/fabricmc/loom/util/Constants.java

@@ -57,4 +57,5 @@ public class Constants {
 	public static final String MAPPINGS_FINAL = "mappingsFinal";
 
 	public static final String MIXIN_COMPILE_EXTENSIONS_VERSION = "0.2.0.3";
+	public static final String DEV_LAUNCH_INJECTOR_VERSION = "0.1.0+build.3";
 }

src/main/java/net/fabricmc/loom/util/RunConfig.java

@@ -29,7 +29,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
-import java.util.Locale;
 import java.util.Map;
 
 import javax.xml.parsers.ParserConfigurationException;
@@ -40,6 +39,7 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
@@ -96,7 +96,7 @@ public class RunConfig {
 	private static void populate(Project project, LoomGradleExtension extension, RunConfig runConfig, String mode) {
 		runConfig.projectName = project.getName();
 		runConfig.runDir = "file://$PROJECT_DIR$/" + extension.runDir;
-		runConfig.vmArgs = "-Dfabric.development=true -Djava.library.path=\"" + extension.getNativesDirectory().getAbsolutePath() + "\"";
+		runConfig.vmArgs = "";
 
 		switch (extension.getLoaderLaunchMethod()) {
 		case "launchwrapper":
@@ -104,52 +104,37 @@ public class RunConfig {
 			runConfig.programArgs = "--tweakClass " + ("client".equals(mode) ? Constants.DEFAULT_FABRIC_CLIENT_TWEAKER : Constants.DEFAULT_FABRIC_SERVER_TWEAKER);
 			break;
 		default:
-			runConfig.mainClass = "net.fabricmc.loader.launch.knot.Knot" + mode.substring(0, 1).toUpperCase(Locale.ROOT) + mode.substring(1).toLowerCase(Locale.ROOT);
+			runConfig.mainClass = "net.fabricmc.devlaunchinjector.Main";
 			runConfig.programArgs = "";
+			runConfig.vmArgs = "-Dfabric.dli.config=\"" + extension.getDevLauncherConfig().getAbsolutePath() + "\" -Dfabric.dli.env=" + mode.toLowerCase();
 			break;
 		}
 
-		// if installer.json found...
-		JsonObject installerJson = extension.getInstallerJson();
+		if (extension.getLoaderLaunchMethod().equals("launchwrapper")) {
+			// if installer.json found...
+			JsonObject installerJson = extension.getInstallerJson();
 
-		if (installerJson != null) {
-			List<String> sideKeys = ImmutableList.of(mode, "common");
+			if (installerJson != null) {
+				List<String> sideKeys = ImmutableList.of(mode, "common");
 
-			// copy main class
-			if (installerJson.has("mainClass")) {
-				JsonElement mainClassJson = installerJson.get("mainClass");
+				// copy launchwrapper tweakers
+				if (installerJson.has("launchwrapper")) {
+					JsonObject launchwrapperJson = installerJson.getAsJsonObject("launchwrapper");
 
-				if (mainClassJson.isJsonObject()) {
-					JsonObject mainClassesJson = mainClassJson.getAsJsonObject();
+					if (launchwrapperJson.has("tweakers")) {
+						JsonObject tweakersJson = launchwrapperJson.getAsJsonObject("tweakers");
+						StringBuilder builder = new StringBuilder();
 
-					for (String s : sideKeys) {
-						if (mainClassesJson.has(s)) {
-							runConfig.mainClass = mainClassesJson.get(s).getAsString();
-							break;
-						}
-					}
-				} else {
-					runConfig.mainClass = mainClassJson.getAsString();
-				}
-			}
-
-			// copy launchwrapper tweakers
-			if (installerJson.has("launchwrapper")) {
-				JsonObject launchwrapperJson = installerJson.getAsJsonObject("launchwrapper");
-
-				if (launchwrapperJson.has("tweakers")) {
-					JsonObject tweakersJson = launchwrapperJson.getAsJsonObject("tweakers");
-					StringBuilder builder = new StringBuilder();
-
-					for (String s : sideKeys) {
-						if (tweakersJson.has(s)) {
-							for (JsonElement element : tweakersJson.getAsJsonArray(s)) {
-								builder.append(" --tweakClass ").append(element.getAsString());
+						for (String s : sideKeys) {
+							if (tweakersJson.has(s)) {
+								for (JsonElement element : tweakersJson.getAsJsonArray(s)) {
+									builder.append(" --tweakClass ").append(element.getAsString());
+								}
 							}
 						}
-					}
 
-					runConfig.programArgs += builder.toString();
+						runConfig.programArgs += builder.toString();
+					}
 				}
 			}
 		}
@@ -163,8 +148,8 @@ public class RunConfig {
 		RunConfig ideaClient = new RunConfig();
 		populate(project, extension, ideaClient, "client");
 		ideaClient.configName = "Minecraft Client";
-		ideaClient.programArgs += " --assetIndex \"" + minecraftVersionInfo.assetIndex.getFabricId(extension.getMinecraftProvider().minecraftVersion) + "\" --assetsDir \"" + new File(extension.getUserCache(), "assets").getAbsolutePath() + "\"";
 		ideaClient.vmArgs += getOSClientJVMArgs();
+		ideaClient.vmArgs += " -Dfabric.dli.main=" + getMainClass("client", extension);
 
 		return ideaClient;
 	}
@@ -175,10 +160,17 @@ public class RunConfig {
 		RunConfig ideaServer = new RunConfig();
 		populate(project, extension, ideaServer, "server");
 		ideaServer.configName = "Minecraft Server";
+		ideaServer.vmArgs += " -Dfabric.dli.main=" + getMainClass("server", extension);
 
 		return ideaServer;
 	}
 
+	//This can be removed at somepoint, its not ideal but its the best solution I could thing of
+	public static boolean needsUpgrade(File file) throws IOException {
+		String contents = FileUtils.readFileToString(file, StandardCharsets.UTF_8);
+		return !(contents.contains("net.fabricmc.devlaunchinjector.Main"));
+	}
+
 	public String fromDummy(String dummy) throws IOException {
 		String dummyConfig;
 
@@ -202,4 +194,28 @@ public class RunConfig {
 
 		return "";
 	}
+
+	private static String getMainClass(String side, LoomGradleExtension extension) {
+		JsonObject installerJson = extension.getInstallerJson();
+
+		if (installerJson != null && installerJson.has("mainClass")) {
+			JsonElement mainClassJson = installerJson.get("mainClass");
+
+			String mainClassName = "";
+
+			if (mainClassJson.isJsonObject()) {
+				JsonObject mainClassesJson = mainClassJson.getAsJsonObject();
+
+				if (mainClassesJson.has(side)) {
+					mainClassName = mainClassesJson.get(side).getAsString();
+				}
+			} else {
+				mainClassName = mainClassJson.getAsString();
+			}
+
+			return mainClassName;
+		}
+
+		throw new RuntimeException("Failed to find mainclass");
+	}
 }

src/main/java/net/fabricmc/loom/util/SetupIntelijRunConfigs.java

@@ -78,11 +78,11 @@ public class SetupIntelijRunConfigs {
 		String clientRunConfig = RunConfig.clientRunConfig(project).fromDummy("idea_run_config_template.xml");
 		String serverRunConfig = RunConfig.serverRunConfig(project).fromDummy("idea_run_config_template.xml");
 
-		if (!clientRunConfigs.exists()) {
+		if (!clientRunConfigs.exists() || RunConfig.needsUpgrade(clientRunConfigs)) {
 			FileUtils.writeStringToFile(clientRunConfigs, clientRunConfig, StandardCharsets.UTF_8);
 		}
 
-		if (!serverRunConfigs.exists()) {
+		if (!serverRunConfigs.exists() || RunConfig.needsUpgrade(serverRunConfigs)) {
 			FileUtils.writeStringToFile(serverRunConfigs, serverRunConfig, StandardCharsets.UTF_8);
 		}
 	}