name: "Code lint"

permissions:
  contents: read

on:
  pull_request:
    branches:
      - main
      - 'users/**'
    paths:
      - 'clang-tools-extra/clang-tidy/**'
      - 'clang-tools-extra/docs/clang-tidy/**'
      - '.github/workflows/pr-code-lint.yml'

jobs:
  code_linter:
    if: github.repository_owner == 'llvm'
    runs-on: ubuntu-24.04
    defaults:
      run:
        shell: bash
    container:
      image: 'ghcr.io/llvm/ci-ubuntu-24.04-lint'
    timeout-minutes: 60
    concurrency:
      group: ${{ github.workflow }}-${{ github.ref }}
      cancel-in-progress: true
    steps:
      - name: Fetch LLVM sources
        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
        with:
          fetch-depth: 2
      
      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@e0021407031f5be11a464abee9a0776171c79891 # v47.0.1
        with:
          separator: ","
          skip_initial_fetch: true
          base_sha: 'HEAD~1'
          sha: 'HEAD'
      
      - name: Listed files
        env:
          CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
        run: |
          echo "Changed files:"
          echo "$CHANGED_FILES"
      
      # TODO: create special mapping for 'codegen' targets, for now build predefined set
      # TODO: add entrypoint in 'compute_projects.py' that only adds a project and its direct dependencies
      - name: Configure and CodeGen
        run: |
          git config --global --add safe.directory '*'

          . <(git diff --name-only HEAD~1...HEAD | python3 .ci/compute_projects.py)

          if [[ "${projects_to_build}" == "" ]]; then
            echo "No projects to analyze"
            exit 0
          fi

          cmake -G Ninja \
                -B build \
                -S llvm \
                -DLLVM_ENABLE_ASSERTIONS=OFF \
                -DLLVM_ENABLE_PROJECTS="${projects_to_build}" \
                -DCMAKE_CXX_COMPILER=clang++ \
                -DCMAKE_C_COMPILER=clang \
                -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
                -DLLVM_INCLUDE_TESTS=OFF \
                -DCLANG_INCLUDE_TESTS=OFF \
                -DCMAKE_BUILD_TYPE=Release

          ninja -C build \
                clang-tablegen-targets \
                genconfusable               # for "ConfusableIdentifierCheck.h"

      - name: Run code linters
        env:
          GITHUB_PR_NUMBER: ${{ github.event.pull_request.number }}
          CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
        run: |
          echo "[]" > comments &&
          python3 llvm/utils/git/code-lint-helper.py \
            --token ${{ secrets.GITHUB_TOKEN }} \
            --issue-number $GITHUB_PR_NUMBER \
            --start-rev HEAD~1 \
            --end-rev HEAD \
            --verbose \
            --changed-files "$CHANGED_FILES"
      
      - name: Upload results
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
        if: always()
        with:
          name: workflow-args
          path: |
            comments