decode_minecraft_music.js

const APPDATA = Deno.env.get("APPDATA");

const index = await Deno.readTextFile(
  `${APPDATA}/.minecraft/assets/indexes/1.19.json`,
);

const json = JSON.parse(index);

const directories = {};
const promises1 = [];
const promises2 = [];

for (const filename in json.objects) {
  if (filename.substring(filename.length - 4) !== ".ogg") {
    continue;
  }

  const hash = json.objects[filename].hash;

  const index = hash.substring(0, 2);
  const object = `${APPDATA}/.minecraft/assets/objects/${index}/${hash}`;

  const directory = filename.substring(0, filename.lastIndexOf("/"));
  (directories[directory] ??= []).push({ filename, object });
}

for (const directory in directories) {
  promises1.push(Deno.mkdir(directory, { recursive: true }));
}

await Promise.all(promises1);

for (const directory in directories) {
  for (const { filename, object } of directories[directory]) {
    const p = Deno.readFile(object).then((x) => Deno.writeFile(filename, x));
    promises2.push(p);
  }
}

await Promise.all(promises2);

console.log("Done.");

this sucks

@broman why are you mean :(

proud Deno hater