name: check and format flake

on:
  pull_request:
    paths:
      - '**.nix'
  push:
    paths:
      - '**.nix'
  workflow_dispatch:

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - uses: cachix/install-nix-action@v19
        with:
          github_access_token: ${{ secrets.GITHUB_TOKEN }}

      - run: nix flake check
  format:
    if: ${{ github.event_name != 'pull_request' }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.ref }}

      - uses: cachix/install-nix-action@v19
        with:
          github_access_token: ${{ secrets.GITHUB_TOKEN }}

      - run: nix fmt

      - uses: EndBug/add-and-commit@v9
        with:
          default_author: github_actions
          message: "chore: format flake"