check-regen-nix.yml

name: check nix regeneration

on:
  pull_request:
    branches:
      - main

jobs:
  build:
    name: Check nix regeneration
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v26

      - name: Set up cachix
        uses: cachix/cachix-action@v14
        with:
          name: cabal-audit
          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}

      - name: regenerate nix
        run: | 
          nix run nixpkgs#cabal-install -- update
          export PRJ_ROOT=./.
          nix -Lv run .#regen-nix

      - name: check for git changes
        run: | 
          if [[ $(git status --porcelain) ]]; then
            echo "Uncommitted changes found after running the regen-nix"
            echo "please run regen-nix or nix run .#regen-nix locally"
            git diff
            exit 1
          else
            echo "No changes found after running the tool."
          fi