adds forge support, fixes some critical errors

util/download.ts

@@ -1,35 +1,41 @@
 import { ensureFile } from "$std/fs/ensure_file.ts";
 
 /**
- * 
  * @param src url of file
  * @param dest destination file. If `useFileName` is true, this should be the destination directory
  * @param [useFileName] whether to use the inferred file name from `src`
  */
 
-export async function downloadFile(src: string, dest: string, useFileName?:boolean) {
+export async function downloadFile(
+  src: string,
+  dest: string,
+  useFileName?: boolean,
+) {
   if (!(src.startsWith("http://") || src.startsWith("https://"))) {
     throw new TypeError("URL must start with be http:// or https://");
   }
 
-  const fileName = src.split('/').at(-1);
-  
-  const resp = await fetch(src);
-  if (!resp.ok) {
+  const fileName = src.split("/").at(-1);
+
+  const res = await fetch(src);
+  if (!res.ok) {
     throw new Deno.errors.BadResource(
-      `Request failed with status ${resp.status}`,
+      `Request failed with status ${res.status}`,
     );
-  } else if (!resp.body) {
+  } else if (!res.body) {
     throw new Deno.errors.UnexpectedEof(
       `The download url ${src} doesn't contain a file to download`,
     );
-  } else if (resp.status === 404) {
+  } else if (res.status === 404) {
     throw new Deno.errors.NotFound(
       `The requested url "${src}" could not be found`,
     );
   }
 
+  const blob = await res.blob();
+  const buffer = await blob.arrayBuffer();
+  const uint8array = new Uint8Array(buffer);
+
   await ensureFile(useFileName ? dest + fileName : dest);
-  const file = await Deno.open(dest, { truncate: true, write: true });
-  resp.body.pipeTo(file.writable);
-}
+  await Deno.writeFile(dest, uint8array);
+}

util/forge.ts

@@ -0,0 +1,15 @@
+export const getForgeDownload = async (version: string, latest?: boolean) => {
+  const res = await fetch(
+    `https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json`,
+  );
+
+  const { promos } = await res.json();
+
+  // https://maven.minecraftforge.net/net/minecraftforge/forge/1.20.1-47.2.1/forge-1.20.1-47.2.1-installer.jar
+
+  let loaderVersion = promos[`${version}-${latest ? "latest" : "recommended"}`];
+
+  if (!loaderVersion) loaderVersion = promos[`${version}-latest`];
+
+  return `https://maven.minecraftforge.net/net/minecraftforge/forge/${version}-${loaderVersion}/forge-${version}-${loaderVersion}-installer.jar`;
+};

util/gameVersions.ts

@@ -0,0 +1,18 @@
+import { ensureFile } from "$std/fs/ensure_file.ts";
+import { Modrinth, ModrinthGameVersion } from "../lib/modrinth.ts";
+
+export const getGameVersions = async (releaseOnly?: boolean) => {
+  const cacheFile = "./cache/gameVersions.json";
+  await ensureFile(cacheFile);
+
+  let versions: ModrinthGameVersion[] = JSON.parse(
+    await Deno.readTextFile(cacheFile) || "[]",
+  );
+
+  if (!versions.length) {
+    versions = await Modrinth.getGameVersions();
+    await Deno.writeTextFile(cacheFile, JSON.stringify(versions));
+  }
+
+  return versions.filter(v => !releaseOnly || v.major);
+};