nix-configs/nixos-modules/default.nix

{ lib, ... }:
{
  imports = builtins.map (n: ./common/${n}) (
    builtins.attrNames (
      lib.filterAttrs (k: v: v == "regular" && lib.hasSuffix ".nix" k) (builtins.readDir ./common)
    )
  );
}