turboprop/lib/rake.nix

let
  ls = dir: with builtins; attrNames (readDir dir);

  mkNamespace = (import ./resources.nix).mkNamespace;
in {
  namespaces = {
    roots,
    extraMetadata ? {},
  }:
    with builtins;
      map
      (name: let
        metadata =
          # Can't use `set?name` or `set.name`
          # because "name" is taken literally.
          if hasAttr name extraMetadata
          then getAttr name extraMetadata
          else extraMetadata.DEFAULT;
      in
        mkNamespace name metadata)
      (concatLists (map ls roots));
}