Initial untested work on mod remapping

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

@@ -0,0 +1,100 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016 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.util;
+
+import net.fabricmc.loom.LoomGradleExtension;
+import net.fabricmc.tinyremapper.OutputConsumerJar;
+import net.fabricmc.tinyremapper.TinyRemapper;
+import net.fabricmc.tinyremapper.TinyUtils;
+import org.apache.commons.io.FileUtils;
+import org.gradle.api.Project;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+
+public class ModRemapper {
+
+	public static void remap(Project project) throws IOException {
+		LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
+		//TODO whats the proper way of doing this???
+		File libsDir = new File(project.getBuildDir(), "libs");
+		File modJar = new File(libsDir, project.getName() + "-" + project.getVersion() + ".jar");
+		File modOutputJar = new File(libsDir, project.getName() + "-" + project.getVersion() + "-final.jar");
+		if (!modJar.exists()) {
+			project.getLogger().error("Could not find mod jar @" + modJar.getAbsolutePath());
+			return;
+		}
+		if (!Constants.MAPPINGS_TINY.get(extension).exists()) {
+			if (!Constants.MAPPINGS_TINY_GZ.get(extension).exists()) {
+				project.getLogger().lifecycle(":downloading tiny mappings");
+				FileUtils.copyURLToFile(new URL("http://asie.pl:8080/job/pomf/" + extension.pomfVersion + "/artifact/build/libs/pomf-tiny-" + extension.version + "." + extension.pomfVersion + ".gz"), Constants.MAPPINGS_TINY_GZ.get(extension));
+			}
+			GZIPInputStream gzipInputStream = new GZIPInputStream(new FileInputStream(Constants.MAPPINGS_TINY_GZ.get(extension)));
+			FileOutputStream fileOutputStream = new FileOutputStream(Constants.MAPPINGS_TINY.get(extension));
+			int length;
+			byte[] buffer = new byte[1024];
+			while ((length = gzipInputStream.read(buffer)) > 0) {
+				fileOutputStream.write(buffer, 0, length);
+			}
+			gzipInputStream.close();
+			fileOutputStream.close();
+		}
+
+		Path mappings = Constants.MAPPINGS_TINY.get(extension).toPath();
+
+		String fromM = "pomf";
+		String toM = "mojang";
+
+		List<File> classpathFiles = new ArrayList<>();
+		classpathFiles.addAll(project.getConfigurations().getByName("compile").getFiles());
+		classpathFiles.addAll(project.getConfigurations().getByName(Constants.CONFIG_MC_DEPENDENCIES_CLIENT).getFiles());
+		classpathFiles.addAll(project.getConfigurations().getByName(Constants.CONFIG_MC_DEPENDENCIES).getFiles());
+		classpathFiles.add(Constants.MINECRAFT_FINAL_JAR.get(extension));
+
+		Path[] classpath = new Path[classpathFiles.size()];
+		for (int i = 0; i < classpathFiles.size(); i++) {
+			classpath[i] = classpathFiles.get(i).toPath();
+		}
+
+		TinyRemapper remapper = TinyRemapper.newRemapper()
+			.withMappings(TinyUtils.createTinyMappingProvider(mappings, fromM, toM))
+			.build();
+
+		OutputConsumerJar outputConsumer = new OutputConsumerJar(modOutputJar);
+		outputConsumer.addNonClassFiles(modJar);
+		remapper.read(modJar.toPath());
+		remapper.read(classpath);
+		remapper.apply(modJar.toPath(), outputConsumer);
+		outputConsumer.finish();
+		remapper.finish();
+	}
+}