{ pkgs, ... }:
let
  inherit (pkgs.lib)
    attrNames
    filterAttrs
    filter
    pathExists
    path
    ;
  isFolderWithFile =
    fileName: basePath: folderName:
    (pathExists (path.append basePath "./${folderName}/${fileName}.nix"));
  getSubDirs = base: attrNames (filterAttrs (n: t: t == "directory") (builtins.readDir base));
  foldersWithNix = base: filter (isFolderWithFile "default.nix") (getSubDirs base);

in
{
  inherit isFolderWithFile foldersWithNix;

  loadSubmodulesFrom =
    basePath: map (folder: path.append basePath "./${folder}/default.nix") (foldersWithNix basePath);
}