name: "nix build check"
on: [pull_request]

jobs:
  nix-build:
    runs-on: ubuntu-24.04
    continue-on-error: true
    steps:
      - uses: actions/checkout@v4

      - uses: cachix/install-nix-action@v30
        with:
          nix_path: nixpkgs=channel:nixos-unstable

      - name: Check flake evaluation
        id: eval
        run: |
          if ! nix eval .#packages.x86_64-linux.handy.drvPath 2>eval_err.log; then
            echo "failed=true" >> "$GITHUB_OUTPUT"
            cat eval_err.log
          fi

      - name: Hint on evaluation failure
        if: steps.eval.outputs.failed == 'true'
        run: |
          echo ""
          echo "::warning::flake.nix evaluation failed — likely outdated outputHashes or bunDeps hash."
          echo ""
          echo "┌─────────────────────────────────────────────────────────────────┐"
          echo "│  To fix, run on NixOS, Ubuntu/Debian, macOS with nix installed: │"
          echo "│                                                                 │"
          echo "│    ./scripts/update-nix-hashes.sh                               │"
          echo "│                                                                 │"
          echo "│  The script will update version keys and hashes in flake.nix    │"
          echo "│  automatically. Commit the resulting changes.                   │"
          echo "└─────────────────────────────────────────────────────────────────┘"
          echo ""
          cat eval_err.log
          exit 1