let
  sources = import ./npins;
in
{
  pkgs ? import sources.nixpkgs {
    overlays = map import [
      ./nix/overlays/agenix.nix
      ./nix/overlays/disko.nix
      ./nix/overlays/npins.nix
      ./nix/packages/overlay.nix
    ];
  },
  withGHC ? false,
}:
let
  inherit (pkgs) lib;
in
pkgs.mkShell {
  packages =
    with pkgs;
    [
      agenix # from agenix repo
      npins # from npins repo
      disko # from disko flake
      stow
      manage
      nixos-anywhere # comes from nixpkgs
    ]
    ++ lib.optionals withGHC [
      (haskellPackages.ghcWithPackages (self: [
        self.xmonad-contrib
        self.xmonad-extras
        self.xmobar
      ]))
      cabal-install
    ];
}