releaser.yml

name: Releaser
on:
  workflow_call:
    inputs:
      branches:
        required: false
        type: string
        default: ${{ format('["{0}"]', github.event.repository.default_branch) }}

jobs:
  releaser:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - id: version
        name: Determine version
        run: jq -r .version version.json | xargs -I{} echo "version={}" | tee -a $GITHUB_OUTPUT
      - id: latest
        if: steps.version.outputs.version != ''
        name: Determine latest version
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          git fetch origin --tags
          echo -e "$VERSION\n$(git tag)" | sort -V | tail -n1 | xargs -I{} echo "latest={}" | tee -a $GITHUB_OUTPUT
      - id: branch
        name: Check if the branch is a release branch
        if: steps.version.outputs.version != ''
        env:
          BRANCHES: ${{ inputs.branches }}
          REF: ${{ github.ref }}
        uses: actions/github-script@v6
        with:
          script: |
            const branches = JSON.parse(process.env.BRANCHES);
            const ref = process.env.REF.replace(/^refs\/heads\//, '');
            const release = branches.some(b => {
              const regexPattern = b.replace(/\*/g, '.*');
              const regex = new RegExp(`^${regexPattern}$`);
              return regex.test(ref);
            });
            console.log(`This is a release branch: ${release}`);
            core.setOutput('release', release);
      - id: pr
        if: steps.version.outputs.version != '' && steps.branch.outputs.release == 'false'
        name: Check if this is a merge commit of a release PR
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPOSITORY: ${{ github.repository }}
          QUERY: repository:${{ github.repository }} is:pr is:merged ${{ github.sha }}
          SHA: ${{ github.sha }}
        uses: actions/github-script@v6
        with:
          script: |
            const [owner, repo] = process.env.REPOSITORY.split('/');
            const items = await github.paginate(github.rest.search.issuesAndPullRequests, {
              q: process.env.QUERY,
            });
            let pr;
            for (const item of items) {
              const candidate = await github.rest.pulls.get({
                owner,
                repo,
                pull_number: item.number,
              });
              if (candidate.data.merge_commit_sha === process.env.SHA) {
                pr = candidate;
                break;
              }
            }
            if (pr !== undefined) {
              console.log(`Found PR: ${pr.data.html_url}`);
              const labels = pr.data.labels.map(l => l.name);
              const release = labels.includes('release');
              console.log(`This is a release PR: ${release}`);
              core.setOutput('release', release);
            } else {
              console.log('No PR found');
              core.setOutput('release', false);
            }
      - id: tag
        name: Check if tag already exists
        if: steps.branch.outputs.release == 'true' || steps.pr.outputs.release == 'true'
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          git fetch origin --tags
          status=0
          git rev-list "$VERSION" &> /dev/null || status=$?
          if [[ $status == 0 ]]; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi
      - id: release
        name: Create release
        if: steps.tag.outputs.exists == 'false'
        uses: galargh/action-gh-release@571276229e7c9e6ea18f99bad24122a4c3ec813f # https://github.com/galargh/action-gh-release/pull/1
        with:
          draft: false
          tag_name: ${{ steps.version.outputs.version }}
          generate_release_notes: true
          target_commitish: ${{ github.sha }}
          make_latest: ${{ steps.version.outputs.version == steps.latest.outputs.latest }}
      - name: Create release.json
        if: steps.release.outputs.id != ''
        env:
          RELEASE: |
            {
              "draft": false,
              "version": "${{ steps.version.outputs.version }}",
              "url": "${{ steps.release.outputs.url }}",
              "id": "${{ steps.release.outputs.id }}",
              "upload_url": "${{ steps.release.outputs.upload_url }}",
              "assets": ${{ steps.release.outputs.assets }},
              "make_latest": ${{ steps.version.outputs.version == steps.latest.outputs.latest }}
            }
        run: jq . <<< "$RELEASE" > release.json
      - name: Upload release.json
        if: steps.release.outputs.id != ''
        uses: actions/upload-artifact@v3
        with:
          name: release
          path: release.json