DecompilerMC

This tool automatically decompiles and remaps specific Minecraft versions. (Specifically, it converts Mojang's mappings from their proguard format to the tsrg format. SpecialSource then uses that and remaps the client jar, which is then decompiled either with CFR (code only) or Fernflower (assets and code).)

Your output will be readable/executable code similar to ModCoderPack or other decompilers.

Prerequisites

• An Internet connection (to download the mappings)
• Windows, macOS, or Linux
• Java 8 or higher
• Python 3.7 or higher

Running

Simply run python3 main.py in your terminal. You can also specify the following arguments and options:

usage: main.py [-h] [--interactive INTERACTIVE] [--side {client,server}] [--clean] [--force] [--decompiler {fernflower,cfr}] [--quiet]
               [mcversion]

Decompile Minecraft source code

positional arguments:
  mcversion             The version you want to decompile (any version starting from 19w36a (snapshot) and 1.14.4 (releases)) Use 'snap' for
                        latest snapshot or 'latest' for latest version

options:
  -h, --help            show this help message and exit
  --interactive, -i INTERACTIVE
                        Enable an interactive CLI to specify options (all other command line arguments, besides --quiet, will be ignored)
  --side, -s {client,server}
                        Whether to decompile the client side or server side
  --clean, -c           Clean old runs
  --force, -f           Force resolving conflicts by replacing old files
  --decompiler, -d {fernflower,cfr}
                        Select a copmiler to run
  --quiet, -q           Suppresses logging output

Examples:

• Decompile latest release without any output: python3 main.py --mcv latest -q
• Decompile latest snapshot server side with output: python3 main.py snap --side server
• Decompile 1.14.4 client side with output, cleaning up old runs: python3 main.py 1.14.4 -s client -f -q -c

CFR decompilation takes approximately 60s and fernflower takes roughly 200s. The code will then be inside the folder called ./src/<name_version(option_hash)>/<side>; you can find the jar and the version manifest in the ./versions/ directory.

The ./tmp/ directory can be removed without impact.

There is a common release here: https://github.com/hube12/DecompilerMC/releases/latest for all versions.

Building Executable

To build DecompilerMC as an executable using pyinstaller, you can run the following:

pyinstaller main.py --distpath build --onefile

If you do not have pyinstaller, you can install it via pip: pip install pyinstaller