name: format
run-name: Checking formatting
on: push

jobs:
  format:
    name: Check formatting
    runs-on: ubuntu-latest
    if: github.head_ref != 'style/fix-formatting'

    steps:
      - name: Checkout
        uses: actions/checkout@v7
      - name: Install Lix
        uses: ./.github/actions/install-lix
      - name: Check formatting
        id: format
        run: |
          if nix fmt -- --ci; then
            echo "fixed=false" >> $GITHUB_OUTPUT
          else
            nix fmt
            echo "fixed=true" >> $GITHUB_OUTPUT
            exit 1
          fi
      - name: Create pull request
        if: failure() && steps.format.outputs.fixed == 'true'
        uses: peter-evans/create-pull-request@v8
        with:
          body: "This PR fixes formatting issues automatically detected by CI."
          branch: "style/fix-formatting"
          commit-message: "style(repo): fix formatting"
          delete-branch: true
          title: "style(repo): fix formatting"