name: 'Prepare new PR'
on:
  pull_request_target:
    types: [opened, synchronize]
    branches: [ 'main*' ]
    paths: ['.chloggen/*']

jobs:
  prepare-new-pr:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    if: ${{ github.repository_owner == 'open-telemetry' }}
    steps:
      # check out main
      - uses: actions/checkout@v4
      # sparse checkout to only get the .chloggen directory
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
          path: prchangelog
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          sparse-checkout: .chloggen

      # we're going to run prepare-new-pr script from the main branch
      # to parse changelog record from the PR branch.
      - name: Run prepare-new-pr.sh
        run: ./.github/scripts/prepare-new-pr.sh
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.number }}
          PR_CHANGELOG_PATH: prchangelog