release.mjs

//Imports
import github from "@actions/github"
import paths from "path"
import url from "url"
import sgit from "simple-git"

//Git setup
const __metrics = paths.join(paths.dirname(url.fileURLToPath(import.meta.url)), "..")
const git = sgit(__metrics)

//Setup octokit
const token = process.env.GITHUB_TOKEN
const rest = github.getOctokit(token)

//Environment
const maintainer = "lowlighter"
const repository = process.env.GITHUB_REPOSITORY.match(/^(?<owner>[\s\S]+)[/](?<name>[\s\S]+)$/)?.groups ?? null
const version = process.env.GITHUB_COMMIT_MESSAGE.match(/(?<version>v\d+[.]\d+)/)?.groups?.version ?? null

//Check arguments
if ((!repository)||(!repository.name)||(!repository.owner))
  throw new Error(`Could not parse repository "${process.env.GITHUB_REPOSITORY}"`)
console.log(`Repository: ${repository.owner}/${repository.name}`)
if (!version)
  throw new Error(`Could not parse version from "${process.env.GITHUB_COMMIT_MESSAGE}"`)
console.log(`Version: ${version}`)

//Load related pr
const {data:{items:prs}} = await rest.search.issuesAndPullRequests({
  q:`repo:${repository.owner}/${repository.name} is:pr is:merged author:${maintainer} assignee:${maintainer} Release ${version} in:title`
})

//Ensure that there is exactly one pr matching
if (prs.length < 1)
  throw new Error(`No matching prs found`)
if (prs.length > 1)
  throw new Error(`Multiple prs found (${prs.length} matching)`)
const [patchnote] = prs
console.log(`Using pr#${patchnote.number}: ${patchnote.title}`)

//Check whether release already exists
try {
  const {data:{id}} = await rest.repos.getReleaseByTag({owner:repository.owner, repo:repository.name, tag:version})
  console.log(`Release ${version} already exists (#${id}), will replace it`)
  await rest.repos.deleteRelease({owner:repository.owner, repo:repository.name, release_id:id})
  console.log(`Deleting tag ${version}`)
  await git.push(["--delete", "origin", version])
  await new Promise(solve => setTimeout(solve, 15*1000))
}
catch {
  console.log(`Release ${version} does not exists yet, will create it`)
}

//Publish release
await rest.repos.createRelease({owner:repository.owner, repo:repository.name, tag_name:version, name:`Version ${version.replace(/^v/g, "")}`, body:patchnote.body})
console.log(`Successfully published`)