clang-format-checker.yml

name: 'PR clang-format checker'
on:
  pull_request_target:
    types:
      - opened
      - edited
      - synchronize
      - reopened
jobs:
  check-pr-formatting:
    permissions:
      contents: read
      pull-requests: write
      checks: write
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Comparing PR against target branch
        env:
          PR_NUMBER: ${{ github.event.number }}
          GH_TOKEN: ${{ github.token }}
        run: |
            echo Comparing $PR_NUMBER vs target branch
            git fetch origin refs/pull/$PR_NUMBER/head:pull/$PR_NUMBER
            git checkout pull/$PR_NUMBER
            git diff -U0 --no-color $GITHUB_REF..pull/$PR_NUMBER | clang-format-diff-15 -p1 | tee format.diff
            if [ -s format.diff ]
            then
              echo PR contains clang-format violations. First 50 lines of the diff: >> message.txt
              echo \`\`\`diff >> message.txt
              cat format.diff | head -n 50 >> message.txt
              echo \`\`\` >> message.txt
              echo See [action log]\(https://github.com/microsoft/DirectXShaderCompiler/actions/runs/$GITHUB_RUN_ID/) for the full diff.  >> message.txt
              gh pr comment $PR_NUMBER --body-file message.txt
              exit 1
            fi