bumpversion.ts

#!/usr/bin/env -S deno run --allow-run --allow-read --allow-write

const dec = (data: BufferSource) => new TextDecoder().decode(data).trim();
const enc = (data: object) =>
  new TextEncoder().encode(JSON.stringify(data, null, 2));
const run = (...args: ConstructorParameters<typeof Deno.Command>) =>
  new Deno.Command(...args).output()
    .then((data: { stdout: BufferSource }) => dec(data.stdout));

const git = (...args: string[]) => run("git", { args });
const convco = (...args: string[]) => run("convco", { args });

const convcoNextVersion = () => convco("version", "--bump", "HEAD");

interface DenoJson extends Record<string, unknown> {
  version: string;
}

async function readDeno(): Promise<DenoJson> {
  const content = await Deno.readFile("./deno.json").then(dec);
  return JSON.parse(content);
}

async function setVersion(newVersion: string, json: DenoJson) {
  const newJson = structuredClone(json);
  newJson.version = newVersion;
  await Deno.writeFile("./deno.json", enc(newJson));
}

const denoData = await readDeno();

const current_branch = await git("rev-parse", "--abbrev-ref", "HEAD");
const release_branch = "main";

if (import.meta.main) {
  if (current_branch != release_branch) {
    console.error(`can only bump version on ${release_branch}`);
    Deno.exit(1);
  } else {
    const next_version = await convcoNextVersion();
    await setVersion(next_version, denoData);
    await run("deno", { args: ["fmt"] });

    await git("add", "deno.json", "deno.lock");
    await git("commit", "-m", "chore: bump version");
    await git("tag", `v${next_version}`);

    await convco("changelog", "-o", "CHANGELOG.md");
    await run("deno", { args: ["fmt"] });

    await git("add", "CHANGELOG.md");
    await git("commit", "-m", "chore: changelog");
  }
}