servers/lib/packages.nix

pkgs:
let
  getPackages =
    dir:
    let
      entries = builtins.readDir dir;

      procEntry =
        name: type:
        let
          path = dir + "/${name}";
        in
        if type == "directory" then
          (if builtins.pathExists (path + "/default.nix") then [ path ] else [ ])
        else
          [ ];
    in
    builtins.concatLists (builtins.attrValues (builtins.mapAttrs procEntry entries));

  buildPackage = path: {
    name = builtins.baseNameOf (toString path);
    value = pkgs.callPackage (path + "/default.nix") { };
  };
in
builtins.listToAttrs (builtins.map buildPackage (getPackages ../packages))