release-reusable.yml

name: Reusable - Create Release from Changelog

on:
  workflow_call:
    inputs:
      tag:
        description: Tag name to create a release for (e.g. v2.88.0 or v2.88.0-prerelease)
        required: true
        type: string

permissions:
  contents: write

jobs:
  create-release:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout tag
        uses: actions/checkout@v4
        with:
          ref: refs/tags/${{ inputs.tag }}

      - name: Create release from CHANGELOG
        uses: actions/github-script@v7
        env:
          TAG: ${{ inputs.tag }}
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { readFile } = require('fs/promises');

            const tag = process.env.TAG;
            core.info(`Creating release for tag: ${tag}`);

            if (!tag || !tag.startsWith('v2.')) {
              core.setFailed('Invalid tag name. Tag name must start with "v2."');
              return;
            }

            // Read CHANGELOG.md and extract the latest section (first single '#' header)
            const changelog = await readFile('CHANGELOG.md', 'utf8');
            const headerMatch = changelog.match(/^# .+$/m);
            if (!headerMatch) {
              core.setFailed('Could not find a top-level # header in CHANGELOG.md');
              return;
            }
            const startIdx = changelog.indexOf(headerMatch[0]);
            let endIdx = changelog.indexOf('\n# ', startIdx + headerMatch[0].length);
            if (endIdx === -1) {
              endIdx = changelog.length;
            }
            const releaseNotes = changelog.substring(startIdx, endIdx).trim();

            const isPrerelease = tag.includes('-prerelease');
            core.info(`Prerelease: ${isPrerelease}`);

            try {
              const response = await github.rest.repos.createRelease({
                owner: context.repo.owner,
                repo: context.repo.repo,
                tag_name: tag,
                name: tag,
                body: releaseNotes,
                prerelease: isPrerelease,
              });
              core.info(`Release created: ${response.data.html_url}`);
            } catch (err) {
              if (err && err.status === 422 && err.message && String(err.message).includes('already_exists')) {
                core.warning(`Release for tag '${tag}' already exists.`);
              } else {
                core.setFailed(`Error creating release: ${err?.message ?? err}`);
              }
            }