draft-release.yml

name: Create Release Draft
run-name: Draft Release ${{ inputs.version || github.ref_name }}

on:
  push:
    tags:
    - "v*"
  workflow_dispatch:
    inputs:
      version:
        type: string
        description: Release version, without leading "v"
        required: true

jobs:
  validate:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.script.outputs.version }}
      releaseId: ${{ steps.script.outputs.releaseId }}
    steps:
    - uses: actions/setup-node@v6
      with:
        node-version: '24'  # github-script@v8 uses node 24
    - run: npm install semver
    - uses: actions/github-script@v8
      id: script
      env:
        VERSION: ${{ inputs.version || github.ref_name }}
      with:
        result-encoding: string
        script: |
          const validate = require('semver/functions/valid');
          const version = validate(process.env.VERSION);
          if (!version) {
            core.setFailed(`Version ${process.env.VERSION} is not valid semver`);
          }
          core.setOutput('version', version);
          const { data } = await github.rest.repos.listReleases({
            owner: context.repo.owner,
            repo: context.repo.repo,
          });
          data.forEach(
            ({ name: n, tag_name: t }) => n !== t && core.warning(`Release name and tag mismatch: ${n} != ${t}`)
          )
          // TODO check if version is greater than latest release
          const releases = data.reduce((acc, { id, name, draft }) => Object.assign(acc, {
           [name.replace(/^v/, '')]: { id, name, draft }
          }), {});
          if (releases[version]) {
            if (!releases[version].draft) {
              return core.setFailed(`Release ${version} already exists and is published`);
            }
            core.setOutput('releaseId', releases[version].id);
            core.warning(`Release ${version} already exists as draft, will be updated`);
          }

  draft:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    needs: validate
    steps:
    - uses: actions/checkout@v5
    - run: echo > RELEASE_HEAD.md
    - uses: CSchoel/release-notes-from-changelog@v1
      with:
        version: ${{ needs.validate.outputs.version }}
    - uses: actions/github-script@v8
      env:
        VERSION: ${{ needs.validate.outputs.version }}
        RELEASE_ID: ${{ needs.validate.outputs.releaseId }}
      with:
        script: |
          const fs = require('fs');
          const notes = fs.readFileSync('RELEASE.md', 'utf8');
          const releaseInfo = {
            owner: context.repo.owner,
            repo: context.repo.repo,
            tag_name: `v${process.env.VERSION}`,
            name: `v${process.env.VERSION}`,
            body: notes,
            draft: true,
            prerelease: false,
          }
          if (process.env.RELEASE_ID) {
            await github.rest.repos.updateRelease(Object.assign(releaseInfo, {
              release_id: parseInt(process.env.RELEASE_ID, 10)
            }));
            core.notice(`Updated existing draft release ${process.env.VERSION}`);
            return;
          }
          await github.rest.repos.createRelease(releaseInfo);
          fs.unlinkSync('RELEASE.md');