flake.nix

{
  description = "Flake utils demo";

  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system};
      in rec {


        packages= flake-utils.lib.flattenTree {
          wp-gen = pkgs.stdenv.mkDerivation {
              name = "wallpaper-generator";
              src = self;
              buildInputs = [ pkgs.luaPackages.luafilesystem pkgs.luaPackages.lgi pkgs.lua ];
              buildPhase = ''
                ${pkgs.lua}/bin/luac -o wallpaper-generator main.lua
                # chmod +x wallpaper-generator
              '';
              installPhase = "mkdir -p $out; mv * $out";
            };
        };
        defaultPackage =packages.wp-gen;

        apps.wp-gen = flake-utils.lib.mkApp { drv =packages.wp-gen; };
        defaultApp = apps.wp-gen;
      });
}