nixpkgs/modules/services/x11/desktop-managers/xterm.nix

{pkgs, config, ...}:

let

  inherit (pkgs.lib) mkOption mkIf;
  cfg = config.services.xserver.desktopManager.xterm;

  options = {

    services.xserver.desktopManager.xterm.enable = mkOption {
      default = true;
      example = false;
      description = "Enable a xterm terminal as a desktop manager.";
    };

  };

in

mkIf cfg.enable {
  require = options;

  services = {
    xserver = {

      desktopManager = {
        session = [{
          name = "xterm";
          start = ''
            ${pkgs.xterm}/bin/xterm -ls &
            waitPID=$!
          '';
        }];
      };

    };
  };

  environment = {
    x11Packages = [
      pkgs.xterm
    ];
  };
}