name: Isort and Black Formatting
# Incrementally reformat only changed files with black, all files with isort
#
# Replaces pre-commit.ci, since it reformats all the files.
# See issue https://github.com/pre-commit-ci/issues/issues/90
#
# The action requires a custom token to trigger workflow after pushing reformatted files back to the branch.
# `secrets.GITHUB_TOKEN` can be used instead, but this will result
# in not running necessary checks after reformatting, which is undesirable.
# For details see https://github.com/orgs/community/discussions/25702

on:
  pull_request_target:
    paths:
      - "**.py"
    types: [opened, synchronize, reopened, labeled, unlabeled]

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

jobs:
  reformat_with_isort_and_black:
    runs-on: ubuntu-latest
    permissions:
      # write permissions required to commit changes
      contents: write
    steps:
      - name: Checkout branch
        uses: actions/checkout@v4
        with:
          # setup repository and ref for PRs, see
          # https://github.com/EndBug/add-and-commit?tab=readme-ov-file#working-with-prs
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.ref }}
          # custom token is required to trigger actions after reformatting + pushing
          token: ${{ secrets.NEMO_REFORMAT_TOKEN }}
          fetch-depth: 0

      - 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@v5
        with:
          python-version: "3.10"

      - name: black
        uses: psf/black@stable
        if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
        with:
          options: "--verbose"
          # apply only to changed files (pass explicitly the files)
          src: "${{ 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"
          # reformat all files with isort – safe since the whole repo is already reformatted
          configuration: ""

      - uses: EndBug/add-and-commit@v9
        # Commit changes. Nothing is committed if no changes.
        with:
          message: Apply isort and black reformatting
          commit: --signoff