set-pr-title.yml

name: Set PR Title to First Commit Message

on:
  pull_request:
    types: [opened, synchronize]

jobs:
  set-pr-title:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          # Fetches the entire commit history so that we can access the first commit
          fetch-depth: 0

      - name: Get first commit message
        run: |
          # Get the SHA of the first commit in the PR
          FIRST_COMMIT_SHA=$(git log --reverse --format="%H" "${{ github.event.pull_request.base.sha }}..HEAD" | head -n 1)
          # Get the message of the first commit in the PR
          FIRST_COMMIT_MESSAGE=$(git log -n 1 --format=%B "$FIRST_COMMIT_SHA")
          echo "FIRST_COMMIT_MESSAGE=$FIRST_COMMIT_MESSAGE" >> $GITHUB_ENV

      - name: Update PR title
        run: gh pr edit "$PR_NUMBER" --title "$FIRST_COMMIT_MESSAGE"
        env:
          FIRST_COMMIT_MESSAGE: ${{ env.FIRST_COMMIT_MESSAGE }}
          GITHUB_TOKEN: ${{ secrets.PIXELASS_PAT_BLIBLA }}
          PR_NUMBER: ${{ github.event.pull_request.number }}