new flake

pkgs/default.nix

@@ -1,6 +1,12 @@
-# Custom packages, that can be defined similarly to ones from nixpkgs
-# You can build them using 'nix build .#example' or (legacy) 'nix-build -A example'
-{pkgs ? (import ../nixpkgs.nix) {}}: {
-  # example = pkgs.callPackage ./example { };
-  npiperelay = pkgs.callPackage ./npiperelay {};
-}
+rec{
+  overlay = final: prev:
+    let
+      dirContents = builtins.readDir ../pkgs;
+      genPackage = name: {
+        inherit name;
+        value = final.callPackage (../pkgs + "/${name}") { };
+      };
+      names = builtins.attrNames dirContents;
+    in
+    builtins.listToAttrs (map genPackage names);
+}