draft.yaml

name: Mark PRs as drafts

on:
  pull_request:

jobs:
  mark-as-draft:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - run: |
          set -e
          git fetch origin "${HEAD_REF}:headref"
          git fetch origin "${GITHUB_REF}:otherref"

          statusfile="$(mktemp)"
          trap 'rm "$statusfile"' EXIT
          chmod 0 -- "$statusfile"

          # hopefully that gives us all the commits needed
          gh api \
              -H "Accept: application/vnd.github+json" \
              "/repos/$REPO/pulls/$PRNUM/commits" \
            | jq -r 'map(.sha)|join("\n")' \
            | while read -r COMMIT; do
            printf 'pondering commit %s\n' "$COMMIT"
            git show -s "$COMMIT"
            git show -s --format='%s' "$COMMIT" | grep -q '^fixup! ' || continue

            gh pr edit "$PR" --add-label 'has fixups'
            chmod +r -- "$statusfile"
          done
          [ -r "$statusfile" ] || gh pr edit "$PR" --remove-label 'has fixups'
        env:
          HEAD_REF: ${{ github.head_ref }}
          PR: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
          PRNUM: ${{ github.event.number }}