Avoid top-level `with ...;` in pkgs/games/factorio/utils.nix

# This file provides a top-level function that will be used by both nixpkgs and nixos

# to generate mod directories for use at runtime by factorio.

{ lib, stdenv }:

with lib;

let

  inherit (lib)

    flatten

    head

    optionals

    optionalString

    removeSuffix

    replaceStrings

    splitString

    unique

    ;

in

{

  mkModDirDrv = mods: modsDatFile: # a list of mod derivations

    let

          # NB: there will only ever be a single zip file in each mod derivation's output dir

          ln -s $modDrv/*.zip $out

        done

      '' + (lib.optionalString (modsDatFile != null) ''

      '' + (optionalString (modsDatFile != null) ''

       cp ${modsDatFile} $out/mod-settings.dat

      '');

    };