wrappers: migrate to nilla

wrappers/default.nix

@@ -1,25 +1,32 @@
-{ inputs, ... }:
+{ lib, config }:
+let
+  systems = [
+    "x86_64-linux"
+    "aarch64-linux"
+    "aarch64-darwin"
+  ];
+  wrappedPerSystem = lib.attrs.generate systems (
+    system:
+    config.inputs.wrapper-manager-hm-compat.result.lib {
+      pkgs = config.inputs.nixpkgs.result.legacyPackages.${system};
+      modules = [
+        ./starship
+        ./helix
+        # TODO: Enable again
+        # ./rash
+        ./fish
+        ./wezterm
+      ];
+      specialArgs.inputs = builtins.mapAttrs (_: input: input.result) config.inputs;
+    }
+  );
+  wrappedPerSystem' = builtins.mapAttrs (_: wrapped: wrapped.config.build.packages) wrappedPerSystem;
+  wrapperNames = builtins.attrNames wrappedPerSystem'."x86_64-linux";
+in
 {
-  perSystem =
-    { pkgs, inputs', ... }:
-    let
-      wrapped = inputs.wrapper-manager-hm-compat.lib {
-        inherit pkgs;
-        modules = [
-          ./starship
-          ./helix
-          # TODO: Enable again
-          # ./rash
-          ./fish
-          ./wezterm
-        ];
-        specialArgs = {
-          inherit inputs inputs';
-        };
-      };
-      all-packages = wrapped.config.build.packages;
-    in
-    {
-      packages = all-packages;
-    };
+  config.packages = lib.attrs.generate wrapperNames (wrapper: {
+    inherit systems;
+    builder = "custom-load";
+    package = { system }: wrappedPerSystem'.${system}.${wrapper};
+  });
 }