oizys/lib/find-modules.nix

{...}: let
  inherit (builtins) concatLists attrValues mapAttrs elemAt match readDir;
in rec {
  # https://github.com/balsoft/nixos-config/blob/73cc2c3a8bb62a9c3980a16ae70b2e97af6e1abd/flake.nix#L109-L120
  findModulesList = dir:
    concatLists (attrValues (mapAttrs
      (name: type:
        if type == "regular"
        then [
          {
            name = elemAt (match "(.*)\\.nix" name) 0;
            value = dir + "/${name}";
          }
        ]
        else if
          (readDir (dir + "/${name}"))
          ? "default.nix"
        then [
          {
            inherit name;
            value = dir + "/${name}";
          }
        ]
        else findModulesList (dir + "/${name}")) (readDir dir)));
}