dotfiles.nix/modules/mk-primary-user-module.nix

optionName:
{ config, lib, pkgs, ... }:

let
  inherit (lib) mkOption types;
  inherit (pkgs.stdenv) isDarwin;
  cfg = config.${optionName}.primaryUser;

in {
  options.${optionName}.primaryUser = {
    username = mkOption { type = types.str; };
    fullName = mkOption { type = types.str; };
    email = mkOption { type = types.str; };
    homeDirectory = mkOption {
      type = types.str;
      default = let prefix = if isDarwin then "/Users" else "/home";
      in "${prefix}/${cfg.username}";
    };
    nixConfigDirectory = mkOption {
      type = types.str;
      default = "${cfg.homeDirectory}/dotfiles.nix";
    };
  };
}