Use ForgeGradle for producing SRG jars for patching

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

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+/*
+ * 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.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.function.Consumer;
+
+import com.google.common.collect.ImmutableMap;
+import org.gradle.api.Project;
+
+import net.fabricmc.loom.util.Constants;
+import net.fabricmc.loom.util.DependencyProvider;
+
+public class McpConfigProvider extends DependencyProvider {
+	private File mcp;
+	private File srg;
+
+	public McpConfigProvider(Project project) {
+		super(project);
+	}
+
+	@Override
+	public void provide(DependencyInfo dependency, Consumer<Runnable> postPopulationScheduler) throws Exception {
+		init(dependency.getDependency().getVersion());
+
+		if (mcp.exists() && srg.exists()) {
+			return; // No work for us to do here
+		}
+
+		Path mcpZip = dependency.resolveFile().orElseThrow(() -> new IllegalStateException("Could not resolve MCPConfig")).toPath();
+
+		if (!mcp.exists()) {
+			Files.copy(mcpZip, mcp.toPath());
+		}
+
+		if (!srg.exists()) {
+			try (FileSystem fs = FileSystems.newFileSystem(new URI("jar:" + mcpZip.toUri()), ImmutableMap.of("create", false))) {
+				Files.copy(fs.getPath("config", "joined.tsrg"), srg.toPath());
+			}
+		}
+	}
+
+	private void init(String version) {
+		mcp = new File(getExtension().getUserCache(), "mcp-" + version + ".zip");
+		srg = new File(getExtension().getUserCache(), "srg-" + version + ".tsrg");
+	}
+
+	public File getMcp() {
+		return mcp;
+	}
+
+	public File getSrg() {
+		return srg;
+	}
+
+	@Override
+	public String getTargetConfig() {
+		return Constants.MCP_CONFIG;
+	}
+}