Code change:
<ins> #!/usr/bin/env nix-shell /* #!nix-shell -i node -p nodejs_18 */ import { promises as fs } from 'node:fs'; const constants = { githubUrl: "https://api.github.com/repos/pulsar-edit/pulsar/releases", sha256FileURL: (newVersion) => `https://github.com/pulsar-edit/pulsar/releases/download/v${newVersion}/SHA256SUMS.txt`, x86_64FileName: (newVersion) => `Linux.pulsar-${newVersion}.tar.gz`, aarch64FileName: (newVersion) => `ARM.Linux.pulsar-${newVersion}-arm64.tar.gz`, targetFile: new URL("default.nix", import.meta.url).pathname, }; async function utf16ToUtf8(blob) { // Sometime, upstream saves the SHA256SUMS.txt file in UTF-16, which absolutely breaks node's string handling // So we need to convert this blob to UTF-8 // We need to skip the first 2 bytes, which are the BOM const arrayBuffer = await blob.slice(2).arrayBuffer(); const buffer = Buffer.from(arrayBuffer); const utf8String = buffer.toString('utf16le'); return utf8String; } async function getLatestVersion() { const requestResult = await fetch(constants.githubUrl); if (!requestResult.ok) { console.error("Failed to fetch releases"); console.error(requestResult); process.exit(1); }; let jsonResult = await requestResult.json(); jsonResult = jsonResult.filter((release) => !release.prerelease && !release.draft); if (jsonResult.length == 0) { console.error("No releases found"); process.exit(1); } return jsonResult[0].tag_name.replace(/^v/, ''); } async function getSha256Sum(hashFileContent, targetFile) { // The upstream file has a fomat like this: // 0000000000000000000000000000000000000000000000000000000000000000 targetFile let sha256 = hashFileContent. split('n'). map(line => line.replace("r", "")). // Side-effect of the UTF-16 conversion, if the file was created from Windows filter((line) => line.endsWith(targetFile))[0]. split(' ')[0]; return "sha256-" + Buffer.from(sha256, 'hex').toString('base64'); } async function getSha256Sums(newVersion) { // Upstream provides a file with the hashes of the files, but it's not in the SRI format, and it refers to the compressed tarball // So let's just use nix-prefetch-url to get the hashes of the decompressed tarball, and `nix hash to-sri` to convert them to SRI format const hashFileUrl = constants.sha256FileURL(newVersion); const hashFileContent = await fetch(hashFileUrl).then((response) => response.blob()); const headerbuffer = await hashFileContent.slice(0, 2).arrayBuffer() const header = Buffer.from(headerbuffer).toString('hex'); // We must detect if it's UTF-16 or UTF-8. If it's UTF-16, we must convert it to UTF-8, otherwise just use it as-is const hashFileContentString = header == 'fffe' ? await utf16ToUtf8(hashFileContent) : await hashFileContent.text(); let x86_64; let aarch64; console.log("Getting new hashes"); let promises = [ getSha256Sum(hashFileContentString, constants.x86_64FileName(newVersion)).then((hash) => { x86_64 = hash; }), getSha256Sum(hashFileContentString, constants.aarch64FileName(newVersion)).then((hash) => { aarch64 = hash; }), ]; await Promise.all(promises); return { x86_64, aarch64 }; } async function updateFile(newVersion, sha256Sums, currentFile) { // There is some assumptions in how the file is formatted, but nothing egregious let newFile = currentFile.replace(/version = "(.*)";/, `version = "${newVersion}";`); newFile = newFile.replace(/x86_64-linux.hash = "(.*)";/, `x86_64-linux.hash = "${sha256Sums.x86_64}";`); newFile = newFile.replace(/aarch64-linux.hash = "(.*)";/, `aarch64-linux.hash = "${sha256Sums.aarch64}";`); await fs.writeFile(constants.targetFile, newFile); }; let currentFile = await fs.readFile(constants.targetFile, 'utf8'); let currentVersion = currentFile.match(/version = "(.*)";/)[1]; const newVersion = await getLatestVersion(); if (currentVersion === newVersion) { console.error("Already up to date"); process.exit(0); } console.log("New version: " + newVersion); const sha256Sums = await getSha256Sums(newVersion); console.log(sha256Sums) if (!sha256Sums.x86_64 || !sha256Sums.aarch64) { console.error("Failed to find sha256 sums for the 2 files"); process.exit(1); } updateFile(newVersion, sha256Sums, currentFile); </ins>

Related discussion:
text: Package name: pulsar Latest released version: 1.117.0 Current version on the unstable channel: 1.114.0 Current version on the stable/release channel: 1.117.0 Notify maintainers