{
  lib,
  ...
}:
let
  applications = [
    "mastodon"
  ];
in
{
  options = lib.genAttrs applications (
    k:
    # TODO: how to type entries here to conform to some common structure?
    lib.mkOption {
      description = "configuration options for ${k}";
      type = lib.types.submodule ./${k};
    }
  );
}