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

let
  direnv_zsh_hook = pkgs.writeTextFile {
    name = "direnv_zsh_hook.zsh";
    text = ''
      eval "$(direnv hook zsh)"
    '';
  };
in
{
  imports = [ ];

  options.me = {
    direnv.enable = lib.mkOption {
      type = lib.types.bool;
      default = false;
      example = true;
      description = "Whether we want to install direnv.";
    };
  };

  config = lib.mkIf config.me.direnv.enable (
    lib.mkMerge [
      {
        environment.systemPackages = with pkgs; [
          direnv
          nix-direnv
        ];

        me.zsh.includes = [ direnv_zsh_hook ];

        environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
          hideMounts = true;
          users.talexander = {
            directories = [
              {
                # List of allowed directories from `direnv allow`.
                directory = ".local/share/direnv";
                user = "talexander";
                group = "talexander";
                mode = "0755";
              }
            ];
          };
        };
      }
    ]
  );
}