{lib, ...}: let
  rootDirs = builtins.readDir ./.;
  removeFiles = lib.attrsets.filterAttrs (n: v: v == "directory") rootDirs;

  getPatches = name:
    builtins.map (value: ./${name}/${value}) (builtins.attrNames (
      lib.attrsets.filterAttrs (
        n: v:
          v == "regular" && lib.strings.hasSuffix ".patch" n
      ) (builtins.readDir ./${name})
    ));

  bigOverlay = final: prev:
    builtins.mapAttrs (
      name: _value:
        prev."${name}".overrideAttrs {
          version = prev."${name}".version + "-patched";
          patches = prev."${name}".patches ++ getPatches name;
        }
    )
    removeFiles;
in {
  nixpkgs.overlays = [
    (
      final: prev: {
        kdePackages = prev.kdePackages.overrideScope bigOverlay;
      }
    )
  ];
}