name: Python syntax & lint

on:
  push:
    branches: ["**"]
  pull_request:
    branches: ["**"]

jobs:
  syntax-lint:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
          pip install flake8

      - name: Run Python syntax check
        run: |
          set -e
          files=$(git ls-files '*.py')
          if [ -z "$files" ]; then echo "No Python files to check"; exit 0; fi
          python -m py_compile $files

      - name: Run flake8 lint
        run: |
          files=$(git ls-files '*.py')
          if [ -z "$files" ]; then echo "No Python files to lint"; exit 0; fi
          flake8 $files