nix.nix

{ system ? builtins.currentSystem }: let

pkgs =
  let
    rev = "02b279323f3b5b031cd8aeb6440d76f0b735855e";
    fetched = builtins.fetchTarball {
      url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
      sha256 = "0waj8ac4gplfqisz037dlicq8l0k41j9h3r93jighg4ildrgg9qc";
    };
  in import fetched { inherit system; };

npmlock2nix =
  let fetched = builtins.fetchGit {
        url = "https://github.com/tweag/npmlock2nix.git";
        rev = "dd2897c3a6e404446704a63f40b9a29fa0acf752";
      };
  in import fetched { inherit pkgs; };

gitignoreSource =
  let fetched = builtins.fetchGit {
        url = "https://github.com/hercules-ci/gitignore.nix";
        rev = "80463148cd97eebacf80ba68cf0043598f0d7438";
      };
  in (import fetched { inherit (pkgs) lib; }).gitignoreSource;

src = gitignoreSource ./.;

shell =
  pkgs.mkShell {
    buildInputs = with pkgs; [ nwjs nodejs-14_x entr ];
    shellHook = ''
      function devt {
        shopt -s globstar
        ls ./**/*.{html,json,js} | entr -cr bash -c 'nw . -- ./example/example.js'
      }
    '';
  };

deriv =
  pkgs.stdenv.mkDerivation {
    name = "nifty-launcher";
    dontUnpack = true;
    installPhase = ''
      mkdir -p $out/bin
      cp -r ${src}/{example,*.{html,js,json}} $out
      cp -r ${npmlock2nix.node_modules { inherit src; }}/node_modules $out
      cat <<EOF > $out/bin/nifty
      ${pkgs.nwjs}/bin/nw $out -- "\$@"
      EOF
      chmod +x $out/bin/nifty
    '';
  };

in { inherit shell deriv; }