feat(apps): add to nixFastBuild and clean up nix code

apps/update-sources/src/misc.ts

@@ -0,0 +1,47 @@
+import { writeFileSync } from 'node:fs';
+import { spawnSync } from 'node:child_process';
+
+import { parseFetchurl } from './lib';
+
+
+/* Constants */
+const FLAKE = process.env.FLAKE;
+
+const genVueText = (
+    version: string,
+    hash: string,
+    url: string,
+) => `# This file was autogenerated. DO NOT EDIT!
+{
+  version = "${version}";
+  url = "${url}";
+  hash = "${hash}";
+}
+`;
+
+export const updateVuetorrent = () => {
+    const FILE = `${FLAKE}/devices/nos/modules/qbittorrent/vuetorrent.nix`;
+
+    const OLD_VERSION = JSON.parse(spawnSync('nix',
+        ['eval', '-f', FILE, '--json'],
+        { shell: true }).stdout.toString()).version;
+
+    const VERSION = JSON.parse(spawnSync('curl',
+        ['-s', 'https://api.github.com/repos/VueTorrent/VueTorrent/releases/latest'],
+        { shell: true }).stdout.toString()).tag_name.replace('v', '');
+
+    const URL = `https://github.com/VueTorrent/VueTorrent/releases/download/v${VERSION}/vuetorrent.zip`;
+    const HASH = parseFetchurl(URL);
+
+    const fileText = genVueText(VERSION, HASH, URL);
+
+    writeFileSync(FILE, fileText);
+
+    return OLD_VERSION !== VERSION ? `Vuetorrent: ${OLD_VERSION} -> ${VERSION}` : '';
+};
+
+export const updateCustomPackage = (pkg: string) => spawnSync(
+    `nix run ${FLAKE}#${pkg}.update`,
+    [],
+    { shell: true },
+).stderr.toString();