format.yml

name: Format
on:
  issue_comment:
    types: [created]
jobs:
  edit:
    name: clang-format
    if: ${{ github.event.comment.body == 'format this please' }}
    runs-on: ubuntu-20.04
    env:
      CLANG_FORMAT: clang-format
    steps:
      - name: Check if message comes from a PR
        uses: octokit/request-action@v2.x
        id: issue_info
        with:
          route: GET /repos/:repository/issues/:pull_number
          repository: ${{ github.repository }}
          pull_number: ${{ github.event.issue.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Get PR info
        if: ${{ fromJSON(steps.issue_info.outputs.data).pull_request }}
        uses: octokit/request-action@v2.x
        id: pr_info
        with:
          route: GET /repos/:repository/pulls/:pull_number
          repository: ${{ github.repository }}
          pull_number: ${{ github.event.issue.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Checkout head branch from PR
        if: ${{ fromJSON(steps.issue_info.outputs.data).pull_request }}
        uses: actions/checkout@master
        with:
          repository: ${{ fromJSON(steps.pr_info.outputs.data).head.repo.full_name }}
          ref: ${{ fromJSON(steps.pr_info.outputs.data).head.ref }}
          token: ${{ secrets.GITHUB_TOKEN }}
      - name: Run clang-format
        if: ${{ fromJSON(steps.issue_info.outputs.data).pull_request }}
        run: find . -type f -regex ".*\.\(c\|h\|cc\|cpp\|hpp\)" -print0 | xargs -0 ${CLANG_FORMAT} -i -style=file
      - name: Commit and push
        if: ${{ fromJSON(steps.issue_info.outputs.data).pull_request }}
        run: |
          git config --global user.name "GitHub Action"
          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add -u
          git commit -m "Format code using $(${CLANG_FORMAT} --version)" || true
          git push