{ callPackage }:

with builtins;
rec {
  listDirectory = action: dir:
    let
      list = readDir dir;
    in listToAttrs (map
      (name: {
        name = replaceStrings [".nix"] [""] name;
        value = action (dir + ("/" + name));
      })
      (attrNames list));

  pathDirectory = listDirectory (x: x);
  importDirectory = listDirectory import;
  callDirectory = listDirectory (p: callPackage p {});
}