name: Pre-commit

on: [pull_request]

jobs:
  pre-commit:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0

      - name: Set up Python
        uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 # v5.2.0
        with:
          python-version: '3.11'
          cache: pip
          cache-dependency-path: |
            **/requirements*.txt
            .pre-commit-config.yaml

      - name: Install pre-commit
        run: |
          python -m pip install --upgrade pip
          pip install pre-commit

      - name: Fetch base branch
        run: git fetch origin ${{ github.event.pull_request.base.ref }}:refs/remotes/origin/${{ github.event.pull_request.base.ref }}

      - name: Fetch head commit from PR
        run: git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-${{ github.event.pull_request.number }}

      - name: Get changed files
        id: changed-files
        run: |
          git diff --name-only origin/${{ github.event.pull_request.base.ref }} pr-${{ github.event.pull_request.number }} > changed_files.txt
          cat changed_files.txt

      - name: Run pre-commit
        run: |
          if [ -s changed_files.txt ]; then
            pre-commit run --files $(cat changed_files.txt | tr '\n' ' ')
          else
            echo "No changed files to run pre-commit on."
          fi