name: Isort and Black Formatting Check
# Check that changed files are formatted with black and isort.
# Fails if any file needs reformatting — run `pre-commit run --all-files` locally to fix.

on:
  pull_request:
    paths:
      - "**.py"
    types: [opened, synchronize, reopened]

defaults:
  run:
    shell: bash -x -e -u -o pipefail {0}

jobs:
  check_isort_and_black:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Checkout branch
        uses: actions/checkout@v6

      - name: Get changed files
        id: changed-files
        uses: step-security/changed-files@v45.0.1
        with:
          files: |
            **.py

      - name: Setup Python env
        uses: actions/setup-python@v6
        with:
          python-version: "3.10"

      - name: black
        uses: psf/black@stable
        if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
        with:
          options: "--check --verbose"
          # check only changed files (pass explicitly the files)
          src: "${{ steps.changed-files.outputs.all_changed_files }}"
          version: "~= 24.3"

      - name: isort
        uses: isort/isort-action@v1
        if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
        with:
          isort-version: "5.13.2"
          configuration: "--check-only --diff"