name: Pull request diff
on:
  pull_request:
    branches:
      - main
jobs:
  diff-expr:
    name: Diff nix expressions
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: cachix/install-nix-action@v17
        with:
          extra_nix_config: |
            substituters = https://cache.nixos.org/ https://f000.backblazeb2.com/file/cache-chir-rs/
            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nixcache:8KKuGz95Pk4UJ5W/Ni+pN+v+LDTkMMFV4yrGmAYgkDg= hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=
      - run: |
          echo "Difference between this PR and main:" > review
          echo "" >> review

          for job in nixos-8gb-fsn1-1 nutty-noon thinkrac installer nas; do
            old_job=$(nix build --dry-run "github:DarkKirb/nixos-config/main#hydraJobs.$job.x86_64-linux" 2>&1 | tail -n1)
            new_job=$(nix build --dry-run ".#hydraJobs.$job.x86_64-linux" 2>&1 | tail -n1)
            echo "<details>" >> review
            echo "<summary>expression difference for $job</summary>" >> review
            nix run 'nixpkgs#nix-diff' $old_job $new_job >> review
            echo "</details>" >> review
          done
      - uses: harupy/comment-on-pr@master
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          filename: review