name: "Check code formatting"

permissions:
  contents: read

on:
  pull_request:
    branches:
      - main
      - 'users/**'

jobs:
  code_formatter:
    runs-on: ubuntu-24.04
    timeout-minutes: 30
    concurrency:
      group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
      cancel-in-progress: true
    if: github.repository == 'llvm/llvm-project'
    steps:
      - name: Fetch LLVM sources
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          fetch-depth: 2

      - name: Get changed files
        id: changed-files
        uses: step-security/changed-files@3dbe17c78367e7d60f00d78ae6781a35be47b4a1 # v45.0.1
        with:
          separator: ","
          skip_initial_fetch: true
          base_sha: 'HEAD~1'
          sha: 'HEAD'

      # We need to pull the script from the main branch, so that we ensure
      # we get the latest version of this script.
      - name: Fetch code formatting utils
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          repository: ${{ github.repository }}
          ref: ${{ github.base_ref }}
          sparse-checkout: |
            llvm/utils/git/requirements_formatting.txt
            llvm/utils/git/code-format-helper.py
          sparse-checkout-cone-mode: false
          path: code-format-tools

      - name: "Listed files"
        env:
          CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
        run: |
          echo "Formatting files:"
          echo "$CHANGED_FILES"

      - name: Install clang-format
        uses: aminya/setup-cpp@17c11551771948abc5752bbf3183482567c7caf0 # v1.1.1
        with:
          clangformat: 20.1.8

      - name: Setup Python env
        uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
        with:
          python-version: '3.11'
          cache: 'pip'
          cache-dependency-path: 'code-format-tools/llvm/utils/git/requirements_formatting.txt'

      - name: Install python dependencies
        run: pip install -r code-format-tools/llvm/utils/git/requirements_formatting.txt

      - name: Run code formatter
        env:
          GITHUB_PR_NUMBER: ${{ github.event.pull_request.number }}
          CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
        # Create an empty comments file so the pr-write job doesn't fail.
        run: |
          echo "[]" > comments &&
          python ./code-format-tools/llvm/utils/git/code-format-helper.py \
            --write-comment-to-file \
            --token ${{ secrets.GITHUB_TOKEN }} \
            --issue-number $GITHUB_PR_NUMBER \
            --start-rev HEAD~1 \
            --end-rev HEAD \
            --changed-files "$CHANGED_FILES"

      - uses: actions/upload-artifact@26f96dfa697d77e81fd5907df203aa23a56210a8 #v4.3.0
        if: always()
        with:
          name: workflow-args
          path: |
            comments