lint-python.yml

name: Lint Python

on:
  pull_request:
    paths:
      - py-polars/**
      - .github/workflows/lint-python.yml

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  ruff:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Get ruff version from requirements file
        id: version
        run: |
          VERSION=$(grep -m 1 -oP 'ruff==\K(.*)' py-polars/requirements-lint.txt)
          echo "version=$VERSION" >> $GITHUB_OUTPUT

      - uses: chartboost/ruff-action@v1
        with:
          src: py-polars/
          version: ${{ steps.version.outputs.version }}
          args: check --no-fix

      - uses: chartboost/ruff-action@v1
        with:
          src: py-polars/
          version: ${{ steps.version.outputs.version }}
          args: format --diff

  mypy:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ['3.8', '3.12']

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}

      - name: Create virtual environment
        run: |
          curl -LsSf https://astral.sh/uv/install.sh | sh
          uv venv
          echo "$GITHUB_WORKSPACE/.venv/bin" >> $GITHUB_PATH
          echo "VIRTUAL_ENV=$GITHUB_WORKSPACE/.venv" >> $GITHUB_ENV

      - name: Install Python dependencies
        working-directory: py-polars
        run: uv pip install -r requirements-dev.txt -r requirements-lint.txt

      # Allow untyped calls for older Python versions
      - name: Run mypy
        working-directory: py-polars
        run: mypy ${{ (matrix.python-version == '3.8') && '--allow-untyped-calls' || '' }}