Remapper ... thing

src/main/java/io/github/moehreag/mojmap_patcher/MojMapPatcher.java

@@ -1,26 +1,56 @@
 package io.github.moehreag.mojmap_patcher;
 
+import io.github.moehreag.mojmap_patcher.api.Mapper;
+import io.github.moehreag.mojmap_patcher.api.data.MappingData;
 import io.github.moehreag.mojmap_patcher.provider.MojmapProvider;
 import io.github.moehreag.mojmap_patcher.parser.ProguardParser;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.commons.ClassRemapper;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Enumeration;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipOutputStream;
 
 public class MojMapPatcher {
 
-    public static void main(String[] args) {
-        String version;
-        if (args.length == 0) {
-            version = "latest-release";
-        } else {
-            version = args[0];
+    public static void main(String[] args) throws IOException {
+        // temporary
+        if (args.length != 3) {
+            System.err.println("Usage: [minecraft-version] [minecraft.jar] [out.jar]");
+            return;
+        }
+
+        String minecraftVersion = args[0];
+        String minecraftJar = args[1];
+        String outJar = args[2];
+
+        MappingData data = ProguardParser.read(MojmapProvider.get(minecraftVersion).orElseThrow());
+        Mapper mapper = new Mapper(data);
+
+        try (ZipFile zipIn = new ZipFile(minecraftJar);
+             ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(outJar))) {
+            Enumeration<? extends ZipEntry> entries = zipIn.entries();
+            while (entries.hasMoreElements()) {
+                ZipEntry entry = entries.nextElement();
+                try (InputStream in = zipIn.getInputStream(entry)) {
+                    zipOut.putNextEntry(new ZipEntry(entry.getName()));
+                    if (!entry.getName().endsWith(".class")) {
+                        in.transferTo(zipOut);
+                        continue;
+                    }
+
+                    byte[] bytes = in.readAllBytes();
+                    ClassReader reader = new ClassReader(bytes);
+                    ClassWriter writer = new ClassWriter(0);
+                    reader.accept(new ClassRemapper(writer, mapper), 0);
+                    zipOut.write(writer.toByteArray());
+                }
+            }
         }
-        MojmapProvider.get(version).map(ProguardParser::read).ifPresent(s -> {
-            //s.getClassFields().keySet().forEach(System.out::println);
-            String mcObf = s.classes().get("net/minecraft/client/Minecraft");
-            s = s.reverse();
-            s.fields()
-                    .entrySet()
-                    .stream()
-                    .filter(entry -> entry.getKey().owner().equals(mcObf))
-                    .forEach(entry -> System.out.println(entry.getKey() + " -> " + entry.getValue()));
-        });
     }
 }

src/main/java/io/github/moehreag/mojmap_patcher/api/Mapper.java

@@ -12,8 +12,8 @@ public class Mapper extends Remapper {
 
     private MappingData data;
 
-    public static Mapper load() {
-        throw new UnsupportedOperationException("TODO");
+    public Mapper(MappingData data) {
+        this.data = data;
     }
 
     @Override