nixos-lib/lib/config.nix

{ lib, myLib }:
with lib;
let
  mkListToString =
    {
      sep ? " ",
    }:
    list: concatStringsSep sep (forEach list (v: toString v));
in
rec {
  mkValueString =
    let
      gen = generators.mkValueStringDefault { };
      listToString = mkListToString { };
    in
    v: if isList v then listToString v else gen v;

  mkKeyValue =
    { sep }:
    with generators;
    toKeyValue {
      mkKeyValue = mkKeyValueDefault {
        mkValueString = mkValueString;
      } sep;
    };

  toSystemd = mkKeyValue {
    sep = "=";
  };
  toNix = mkKeyValue {
    sep = " = ";
  };
}