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