name: Merge

on:
  pull_request:

permissions:
  contents: write
  pull-requests: write

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}

jobs:
  check:
    name: Check
    runs-on: ubuntu-latest
    steps:
      - name: Check
        run: |
          function checks() {
            (gh pr checks "${{ github.event.pull_request.html_url }}" || true) |
              grep --invert-match "${{ github.run_id }}"
          }

          function count() {
            checks |
              cut --fields=2 |
              (grep --count "$@" || true)
          }

          while true; do
            pending=$(count pending)
            if ((pending > 0)); then
              echo "Waiting for $pending checks to complete..."
              sleep 10
            else
              break
            fi
          done

          fail=$(count fail)
          if ((fail > 0)); then
            echo "$fail checks failed"
            exit 1
          else
            echo "All checks passed"
            exit 0
          fi
        env:
          GH_TOKEN: ${{ github.token }}

  merge:
    name: Merge
    if: github.event.pull_request.user.login == 'dependabot[bot]' ||
      github.event.pull_request.user.login == 'pre-commit-ci[bot]'
    runs-on: ubuntu-latest
    steps:
      - name: Enable auto-merge
        run: gh pr merge ${{ github.event.pull_request.html_url }} --auto --squash
        env:
          GH_TOKEN: ${{ github.token }}