add-coauthors.yml

name: Add Co-Authors
on:
  pull_request:
    types: [closed]
  pull_request_review:
    types: [submitted]

jobs:
  check-approval:
    runs-on: ubuntu-latest
    if: github.event.review.state == 'approved'
    steps:
      - name: Add approval status comment
        uses: actions/github-script@v6
        with:
          script: |
            const { owner, repo, number } = context.issue;
            await github.rest.issues.createComment({
              owner,
              repo,
              issue_number: number,
              body: `✅ PR has been approved! CI process initiated.\nCI Run: ${process.env.GITHUB_SERVER_URL}/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID}`
            });

  add-coauthors:
    needs: check-approval
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Setup Git
        run: |
          git config --global user.name "GitHub Actions"
          git config --global user.email "noreply@github.com"

      - name: Add co-authors
        run: |
          # Get the merge commit SHA
          MERGE_COMMIT_SHA=$(git rev-parse HEAD)
          
          # Get the base branch (target of PR)
          BASE_BRANCH="${{ github.event.pull_request.base.ref }}"
          
          # Find merge base
          MERGE_BASE=$(git merge-base HEAD $BASE_BRANCH)
          
          # Get list of commits in PR
          COMMITS=$(git log --format="%H" $MERGE_BASE..$MERGE_COMMIT_SHA)
          
          # Initialize co-authors list
          CO_AUTHORS=""
          
          # Loop through commits
          for commit in $COMMITS; do
            # Get commit author email and name
            AUTHOR_EMAIL=$(git log -1 --format="%ae" $commit)
            AUTHOR_NAME=$(git log -1 --format="%an" $commit)
            
            # Add to co-authors if not already present
            AUTHOR_LINE="Co-authored-by: $AUTHOR_NAME <$AUTHOR_EMAIL>"
            if [[ ! $CO_AUTHORS =~ $AUTHOR_LINE ]]; then
              CO_AUTHORS="$CO_AUTHORS\n$AUTHOR_LINE"
            fi
          done
          
          # Amend the merge commit with co-authors
          if [ ! -z "$CO_AUTHORS" ]; then
            git fetch origin $BASE_BRANCH
            git checkout $BASE_BRANCH
            git pull origin $BASE_BRANCH
            echo -e "\n$CO_AUTHORS" | git commit --amend -F -
            git push origin $BASE_BRANCH

            # Add comment to PR
            gh pr comment ${{ github.event.pull_request.number }} --body "✨ Added co-authors to merge commit.\nCI Status: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}