#!/usr/bin/env node
// Print the CHANGELOG slice for a given tag to stdout.
// Used by the release workflow to attach release notes.

import { readFileSync } from "node:fs";

const tag = process.argv[2];
if (!tag) {
  console.error("Usage: extract-release-notes.mjs vX.Y.Z");
  process.exit(1);
}

const version = tag.replace(/^v/, "");
const changelog = readFileSync("CHANGELOG.md", "utf8");
const re = new RegExp(`## \\[${version.replace(/\./g, "\\.")}\\][\\s\\S]*?(?=\\n## \\[|$)`, "m");
const m = changelog.match(re);

if (!m) {
  console.error(`No CHANGELOG section found for [${version}].`);
  process.exit(1);
}
process.stdout.write(m[0].trim() + "\n");