let
  pkgs = import <nixpkgs> { };

  ides = fetchGit {
    url = "https://git.atagen.co/atagen/ides";
  };

  # create an instance of ides to spawn shells from
  mkIdes = import ides {
    # all args here are optional

    # define the pkgs instance to work with
    inherit pkgs;

    # shell function to wrap -
    # could also use pkgs.mkShellNoCC, but override demonstrates
    # more clearly how to change any aspect of the shell
    shell = pkgs.mkShell.override {
      stdenv = pkgs.stdenvNoCC;
    };

    # input for extra modules that provide service options
    # see modules/redis.nix in ides source for example
    modules = [ ];
    # if you want to include a premade service def,
    # use `imports` in the shell instead
  };
in
mkIdes {
  # import a concrete service definition
  imports = [ ./caddy.nix ];
  # use the options provided by a module
  services.redis = {
    enable = true;
    port = 6889;
    logLevel = "verbose";
  };
  # use normal mkShell options
  nativeBuildInputs = [ pkgs.hello ];
  someEnv = "this";
}