Auto-generate dependencies info resources (Close #41)

Author: Fox2Code

loader/build.gradle

@@ -99,12 +99,15 @@ tasks.compileJava.dependsOn(":patching:jar")
 
 File classDir = new File(project.rootProject.rootDir, "loader" + File.separator +
         "build" + File.separator + "classes" + File.separator + "java" + File.separator + "main")
+File resourcesDir = new File(project.rootProject.rootDir, "loader" + File.separator +
+        "build" + File.separator + "resources" + File.separator + File.separator + "main")
 
 tasks.register("transformFoxLoader", JavaExec) {
     classpath = project(":patching").sourceSets.main.runtimeClasspath
     mainClass = "com.fox2code.foxloader.patching.FoxLoaderPatches"
-    args = [classDir.getAbsolutePath()]
+    args = [classDir.getAbsolutePath(), resourcesDir.getAbsolutePath()]
     dependsOn(tasks.compileJava)
+    dependsOn(tasks.processResources)
 }
 
 tasks.classes.dependsOn(tasks.transformFoxLoader)

patching/src/main/java/com/fox2code/foxloader/patching/FoxLoaderPatches.java

@@ -23,26 +23,34 @@
  */
 package com.fox2code.foxloader.patching;
 
+import com.fox2code.foxloader.dependencies.DependencyHelper;
+import com.fox2code.foxloader.launcher.BuildConfig;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.*;
 
 import java.io.*;
 import java.nio.file.Files;
+import java.util.Locale;
 
 // Allows us to do stuff java doesn't allow us to do.
 public final class FoxLoaderPatches implements Opcodes {
     private static final boolean DEBUG = false;
 
     public static void main(String[] args) throws IOException {
         patchFoxLoaderClassesDir(new File(args[0]));
+        patchFoxLoaderResourcesDir(new File(args[1]));
     }
 
     public static void patchFoxLoaderClassesDir(File classesDir) throws IOException {
         patchFoxClassLoader(classesDir);
     }
 
+    public static void patchFoxLoaderResourcesDir(File resourcesDir) throws IOException {
+        generateDependenciesResources(resourcesDir);
+    }
+
     private static void patchFoxClassLoader(File classesDir) throws IOException {
         File foxClassLoader = new File(classesDir, "com/fox2code/foxloader/launcher/FoxClassLoader.class");
         File source = foxClassLoader;
@@ -108,4 +116,33 @@ private static void patchEarlyEnum(File classesDir, String className) throws IOE
         TransformerUtils.checkBytecodeValidity(classData, true);
         Files.write(enumClassFile.toPath(), classData);
     }
+
+    private static void generateDependenciesResources(File resourcesDir) throws IOException {
+        File metaInf = new File(resourcesDir, "META-INF");
+        if (!metaInf.isDirectory() && !metaInf.mkdirs()) {
+            throw new IOException("Cannot create META-INF directory");
+        }
+        generateDependenciesResource(new File(metaInf, "DEPENDENCIES"),
+                DependencyHelper.commonDependencies);
+        // Add modern dependencies for Unimined support
+        generateDependenciesResource(new File(metaInf, "DEPENDENCIES_MODERN"),
+                DependencyHelper.commonDependenciesModernJava);
+        // Also add modern dependencies for dependency bundle feature on Unimined
+        for (String dependencyBundle : DependencyHelper.availableDependencyBundles) {
+            generateDependenciesResource(
+                    new File(metaInf, "DEPENDENCIES_BUNDLE_" +
+                            (dependencyBundle.toUpperCase(Locale.ROOT))),
+                    DependencyHelper.getDependencyBundle(dependencyBundle));
+        }
+    }
+
+    private static void generateDependenciesResource(
+            File file, DependencyHelper.Dependency[] dependencies) throws IOException {
+        try (PrintStream printStream = new PrintStream(file, "UTF-8")) {
+            printStream.println("# Autogenerated by FoxLoader " + BuildConfig.FOXLOADER_VERSION);
+            for (DependencyHelper.Dependency dependency : dependencies) {
+                printStream.println(dependency.javaSupport + " " + dependency.name);
+            }
+        }
+    }
 }