Make CFR the default decompiler (#527)

* Make CFR the default decompiler
Expose decompiler options

* Remove convention, default value is an empty map.

* Checkstyle..

src/main/java/net/fabricmc/loom/api/decompilers/DecompilationMetadata.java

@@ -26,8 +26,9 @@ package net.fabricmc.loom.api.decompilers;
 
 import java.nio.file.Path;
 import java.util.Collection;
+import java.util.Map;
 
 import net.fabricmc.loom.util.IOStringConsumer;
 
-public record DecompilationMetadata(int numberOfThreads, Path javaDocs, Collection<Path> libraries, IOStringConsumer logger) {
+public record DecompilationMetadata(int numberOfThreads, Path javaDocs, Collection<Path> libraries, IOStringConsumer logger, Map<String, String> options) {
 }

src/main/java/net/fabricmc/loom/decompilers/cfr/LoomCFRDecompiler.java

@@ -32,6 +32,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.Map;
 import java.util.jar.Attributes;
 import java.util.jar.JarOutputStream;
@@ -64,7 +65,10 @@ public class LoomCFRDecompiler implements LoomDecompiler {
 	@Override
 	public void decompile(Path compiledJar, Path sourcesDestination, Path linemapDestination, DecompilationMetadata metaData) {
 		final String path = compiledJar.toAbsolutePath().toString();
-		final Options options = OptionsImpl.getFactory().create(DECOMPILE_OPTIONS);
+		final Map<String, String> allOptions = new HashMap<>(DECOMPILE_OPTIONS);
+		allOptions.putAll(metaData.options());
+
+		final Options options = OptionsImpl.getFactory().create(allOptions);
 
 		ClassFileSourceImpl classFileSource = new ClassFileSourceImpl(options);
 
@@ -138,7 +142,7 @@ public class LoomCFRDecompiler implements LoomDecompiler {
 		decompiler.decompile(Paths.get("input.jar"),
 				Paths.get("output-sources.jar"),
 				lineMap,
-				new DecompilationMetadata(4, null, Collections.emptyList(), null)
+				new DecompilationMetadata(4, null, Collections.emptyList(), null, Collections.emptyMap())
 		);
 
 		LineNumberRemapper lineNumberRemapper = new LineNumberRemapper();

src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricFernFlowerDecompiler.java

@@ -25,6 +25,7 @@
 package net.fabricmc.loom.decompilers.fernflower;
 
 import java.nio.file.Path;
+import java.util.HashMap;
 import java.util.Map;
 
 import org.jetbrains.java.decompiler.main.Fernflower;
@@ -38,12 +39,13 @@ import net.fabricmc.loom.api.decompilers.LoomDecompiler;
 public final class FabricFernFlowerDecompiler implements LoomDecompiler {
 	@Override
 	public String name() {
-		return "FabricFlower"; // Or something else?
+		return "FernFlower";
 	}
 
 	@Override
 	public void decompile(Path compiledJar, Path sourcesDestination, Path linemapDestination, DecompilationMetadata metaData) {
-		Map<String, Object> options = Map.of(
+		final Map<String, Object> options = new HashMap<>(
+				Map.of(
 					IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES, "1",
 					IFernflowerPreferences.BYTECODE_SOURCE_MAPPING, "1",
 					IFernflowerPreferences.REMOVE_SYNTHETIC, "1",
@@ -51,8 +53,11 @@ public final class FabricFernFlowerDecompiler implements LoomDecompiler {
 					IFernflowerPreferences.THREADS, String.valueOf(metaData.numberOfThreads()),
 					IFernflowerPreferences.INDENT_STRING, "\t",
 					IFabricJavadocProvider.PROPERTY_NAME, new TinyJavadocProvider(metaData.javaDocs().toFile())
+				)
 		);
 
+		options.putAll(metaData.options());
+
 		IResultSaver saver = new ThreadSafeResultSaver(sourcesDestination::toFile, linemapDestination::toFile);
 		Fernflower ff = new Fernflower(FernFlowerUtils::getBytecode, saver, options, new FernflowerLogger(metaData.logger()));
 

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

@@ -43,6 +43,7 @@ import javax.inject.Inject;
 
 import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.file.RegularFileProperty;
+import org.gradle.api.provider.MapProperty;
 import org.gradle.api.provider.Property;
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.InputFile;
@@ -83,6 +84,9 @@ public abstract class GenerateSourcesTask extends AbstractLoomTask {
 	@Input
 	public abstract Property<Long> getMaxMemory();
 
+	@Input
+	public abstract MapProperty<String, String> getOptions();
+
 	@Inject
 	public abstract WorkerExecutor getWorkerExecutor();
 
@@ -98,6 +102,7 @@ public abstract class GenerateSourcesTask extends AbstractLoomTask {
 
 		getOutputs().upToDateWhen((o) -> false);
 		getMaxMemory().convention(4096L).finalizeValueOnRead();
+		getOptions().finalizeValueOnRead();
 	}
 
 	@TaskAction
@@ -134,6 +139,8 @@ public abstract class GenerateSourcesTask extends AbstractLoomTask {
 		workQueue.submit(DecompileAction.class, params -> {
 			params.getDecompilerClass().set(decompiler.getClass().getCanonicalName());
 
+			params.getOptions().set(getOptions());
+
 			params.getInputJar().set(getInputJar());
 			params.getRuntimeJar().set(getExtension().getMappingsProvider().mappedProvider.getMappedJar());
 			params.getSourcesDestinationJar().set(getMappedJarFileWithSuffix("-sources.jar"));
@@ -182,6 +189,8 @@ public abstract class GenerateSourcesTask extends AbstractLoomTask {
 	public interface DecompileParams extends WorkParameters {
 		Property<String> getDecompilerClass();
 
+		MapProperty<String, String> getOptions();
+
 		RegularFileProperty getInputJar();
 		RegularFileProperty getRuntimeJar();
 		RegularFileProperty getSourcesDestinationJar();
@@ -231,7 +240,8 @@ public abstract class GenerateSourcesTask extends AbstractLoomTask {
 					Runtime.getRuntime().availableProcessors(),
 					getParameters().getMappings().get().getAsFile().toPath(),
 					getLibraries(),
-					logger
+					logger,
+					getParameters().getOptions().get()
 			);
 
 			decompiler.decompile(

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

@@ -34,7 +34,6 @@ import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.api.decompilers.LoomDecompiler;
 import net.fabricmc.loom.configuration.ide.RunConfigSettings;
 import net.fabricmc.loom.configuration.providers.mappings.MappingsProviderImpl;
-import net.fabricmc.loom.decompilers.fernflower.FabricFernFlowerDecompiler;
 import net.fabricmc.loom.util.Constants;
 
 public final class LoomTasks {
@@ -129,7 +128,7 @@ public final class LoomTasks {
 				return;
 			}
 
-			File inputJar = mappingsProvider.mappedProvider.getMappedJar();
+			File mappedJar = mappingsProvider.mappedProvider.getMappedJar();
 
 			if (mappingsProvider.hasUnpickDefinitions()) {
 				File outputJar = mappingsProvider.mappedProvider.getUnpickedJar();
@@ -140,21 +139,33 @@ public final class LoomTasks {
 					unpickJarTask.getOutputJar().set(outputJar);
 				});
 
-				inputJar = outputJar;
+				mappedJar = outputJar;
 			}
 
+			final File inputJar = mappedJar;
+
 			extension.getGameDecompilers().finalizeValue();
 
 			for (LoomDecompiler decompiler : extension.getGameDecompilers().get()) {
-				String taskName = decompiler instanceof FabricFernFlowerDecompiler ? "genSources" : "genSourcesWith" + decompiler.name();
+				String taskName = "genSourcesWith" + decompiler.name();
-				// decompiler will be passed to the constructor of GenerateSourcesTask
+				// Decompiler will be passed to the constructor of GenerateSourcesTask
-				GenerateSourcesTask generateSourcesTask = tasks.register(taskName, GenerateSourcesTask.class, decompiler).get();
+				tasks.register(taskName, GenerateSourcesTask.class, decompiler).configure(task -> {
-				generateSourcesTask.getInputJar().set(inputJar);
+					task.setDescription("Decompile minecraft using %s.".formatted(decompiler.name()));
+					task.setGroup(Constants.TaskGroup.FABRIC);
+					task.getInputJar().set(inputJar);
 
 					if (mappingsProvider.hasUnpickDefinitions()) {
-					generateSourcesTask.dependsOn(tasks.getByName("unpickJar"));
+						task.dependsOn(tasks.getByName("unpickJar"));
-				}
 					}
 				});
 			}
+
+			tasks.register("genSources", task -> {
+				task.setDescription("Decompile minecraft using the default decompiler.");
+				task.setGroup(Constants.TaskGroup.FABRIC);
+
+				task.dependsOn(project.getTasks().getByName("genSourcesWithCfr"));
+			});
+		});
+	}
 }

src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy

@@ -45,8 +45,8 @@ class DecompileTest extends Specification implements GradleProjectTestTrait {
 
 		where:
 			decompiler 		| task								| version
-			'fernflower'	| "genSources"						| DEFAULT_GRADLE
+			'fernflower'	| "genSourcesWithFernFlower"		| DEFAULT_GRADLE
-			'fernflower'	| "genSources"						| PRE_RELEASE_GRADLE
+			'fernflower'	| "genSourcesWithFernFlower"		| PRE_RELEASE_GRADLE
 			'cfr' 			| "genSourcesWithCfr"				| DEFAULT_GRADLE
 			'cfr' 			| "genSourcesWithCfr"				| PRE_RELEASE_GRADLE
 	}