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