name: Lint

concurrency:
  group: lint-${{ github.head_ref || github.ref }}
  cancel-in-progress: true

on:
  push:
    paths:
    - "**.py"
    - ".github/workflows/lint.yml"
    - ".pylintrc"
    - ".flake8"
    - ".mypy.ini"
  pull_request:
    paths:
    - "**.py"
    - ".github/workflows/lint.yml"
    - ".pylintrc"
    - ".flake8"
    - ".mypy.ini"

permissions:
  contents: read

jobs:

  pylint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - uses: actions/setup-python@v5
      with:
        python-version: '3.x'
    - run: python -m pip install pylint
    - run: pylint --output-format colorized mesonbuild

  flake8:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: '3.x'
      - run: python -m pip install flake8
      - run: flake8 --color always mesonbuild/

  mypy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - uses: actions/setup-python@v5
      with:
        python-version: '3.x'
    # Pin mypy to version 1.8, so we retain the ability to lint for Python 3.7
    - run: python -m pip install "mypy==1.8" strictyaml types-PyYAML types-tqdm types-chevron
    - run: python run_mypy.py --allver
      env:
        PYTHONUNBUFFERED: 1
        TERM: xterm-color
        MYPY_FORCE_COLOR: 1