generate-release-notes.yml

name: Generate release notes

on:
  release:
    types: [published]

permissions:
  contents: write
  pull-requests: read

jobs:
  generate:
    name: Generate and set release notes
    runs-on: ubuntu-latest
    steps:
      - name: Generate notes and update release
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- autogenerated-release-notes -->';
            const owner = context.repo.owner;
            const repo = context.repo.repo;

            const release = context.payload.release;
            const releaseId = release.id;
            const tagName = release.tag_name;

            const existingBody = release.body || '';
            const shouldUpdate =
              existingBody.trim() === '' || existingBody.includes(marker);

            if (!shouldUpdate) {
              core.info('Release body is non-empty and not marked as autogenerated. Skipping update.');
              return;
            }

            core.info(`Generating release notes for tag ${tagName}`);
            const generated = await github.rest.repos.generateReleaseNotes({
              owner,
              repo,
              tag_name: tagName,
            });

            const newBody = `${marker}\n\n${generated.data.body || ''}`.trim() + '\n';

            core.info(`Updating release ${releaseId}`);
            await github.rest.repos.updateRelease({
              owner,
              repo,
              release_id: releaseId,
              body: newBody,
            });