Patchwork Patcher is a set of tools for transforming and patching Forge mod jars into jars that are directly loadable by Fabric Loader. It does the following things currently:

• Remaps Minecraft from official (proguard's obfuscated names) to srg (MCP's runtime mappings)

• Remaps the mod jar from srg to official using Tiny Remapper with the srg minecraft jar on the classpath

• Remaps the mod jar from official to intermediary using Tiny Remapper with the official minecraft jar on the classpath

• Converts the Forge mods.toml manifest to a fabric.mod.json file

• Converts @OnlyIn annotations to @Environment for Fabric

• Strips @ObjectHolder annotations, removes the field's final modifiers, and creates Consumers that set the fields

• Strips @Mod.EventBusSubscriber and @SubscribeEvent annotations and generates event handlers (that handle events) and event registrars (that register event handlers on behalf of a class)

  • Non-static event handlers are not yet supported

• Generates a class implementing ForgeInitializer that registers all the object holders and event registrars

• 1.16.4 only.

Patchwork Patcher generates jars that require a Fabric mod acting as a compatibility layer to run. Patchwork API fulfills this role, most development will happen there.