Enable debug information in java recompile

Author: LexManos

src/main/java/net/minecraftforge/mcmaven/impl/tasks/RecompileTask.java

@@ -67,6 +67,7 @@ private File recompileSourcesImpl(Task inputTask, File output) {
         var sourcesJar = inputTask.execute();
 
         cache.add("sources", sourcesJar);
+        cache.addKnown("debug", "true");
 
         if (Mavenizer.checkCache(output, cache))
             return output;
@@ -78,7 +79,7 @@ private File recompileSourcesImpl(Task inputTask, File output) {
             throw new IllegalStateException("JDK not found: " + javaTarget, e);
         }
 
-        ProcessUtils.recompileJar(jdk, this.classpath.get(), sourcesJar, output);
+        ProcessUtils.recompileJar(jdk, this.classpath.get(), sourcesJar, output, true);
 
         cache.save();
         return output;

src/main/java/net/minecraftforge/mcmaven/impl/util/ProcessUtils.java

@@ -270,7 +270,7 @@ public static Result runJar(File javaHome, File workDir, File logFile, File tool
         }
     }
 
-    public static File recompileJar(File javaHome, List<File> classpath, File sourcesJar, File outputJar) {
+    public static File recompileJar(File javaHome, List<File> classpath, File sourcesJar, File outputJar, boolean enableDebug) {
         // classpath arg
         var classpathString = makeClasspathString(classpath);
 
@@ -326,12 +326,14 @@ public static File recompileJar(File javaHome, List<File> classpath, File source
 
         var outputClasses = new File(temp, "classes");
         FileUtils.ensure(outputClasses);
-        var args = List.of(
+        var args = new ArrayList<>(List.of(
             "-nowarn",
             "-d " + wrap(outputClasses.getAbsolutePath().replace('\\', '/')),
             "-classpath " + wrap(classpathString),
             sourcePath.toString()
-        );
+        ));
+        if (enableDebug)
+            args.add("-g");
 
         var process = ProcessUtils.runJavac(javaHome, temp, new File(outputJar.getAbsolutePath() + ".log"), args);
         if (process.exitCode != 0) {