name: lint

on:
  push:
  pull_request:

jobs:
  lint:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements-dev.txt

      - name: Run Ruff (fail on any diagnostics)
        run: ruff check src tests

      - name: Enforce formatting
        run: |
          ruff format --check src tests
          black --check src tests

      - name: Run mypy
        run: mypy src