{ config, pkgs, inputs, ... }: let
in
  {
    imports = [
      ./app-fix.nix
    ];
    nix.registry.nixpkgs.flake = inputs.nixpkgs;
    nixpkgs.config.allowUnfree = true;
    # Auto upgrade nix package and the daemon service.
    services.nix-daemon.enable = true;
    nix.package = pkgs.nixUnstable;
    nix.settings.auto-optimise-store = false;

    home-manager = {
      useGlobalPkgs = true;
      useUserPackages = true;
      users.users.universelaptop = {
        name = "universelaptop";
        home = "/Users/universelaptop";
      };
      users.universelaptop = { pkgs, ... }: {
        programs.direnv.enable = true;
        programs.direnv.nix-direnv.enable = true;
        programs.bash.enable = true;
        programs.zsh = {
          enable = true;
          shellAliases = {
            ssh = "kitty +kitten ssh";
            sshu = "ssh universe";
          };
        };
        home.stateVersion = "22.05";
      };
    };

    environment.variables = {
      EDITOR = "emacs";
    };

    environment.systemPackages = (with pkgs; [
      mac-emacs
      (aspellWithDicts (p: with p;[
        en
        en-computers
        en-science
      ]))
      pandoc
      texlive.combined.scheme-full
      wget

      kitty
      
      btop

      cbqn-replxx
    ]);    

    # Create /etc/zshrc that loads the nix-darwin environment.
    programs.bash.enable = true;  # default shell on catalina
    programs.zsh.enable = true;  # default shell on catalina

    # Used for backwards compatibility, please read the changelog before changing.
    # $ darwin-rebuild changelog
    system.stateVersion = 4;
  }