refactor(flake): only use lib, reduce imports

flake.nix

@@ -11,40 +11,19 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
-  outputs = inputs: let
+  outputs = inputs:
-    lib = inputs.nixpkgs.lib.extend (import ./lib.nix);
-  in
     inputs.parts.lib.mkFlake {
       inherit inputs;
-      specialArgs.lib = lib;
     } {
       systems = [
         "x86_64-linux"
       ];
 
-      perSystem = {
+      imports = [
-        pkgs,
+        ./lib.nix
-        self',
-        config,
-        system,
-        ...
-      }: {
-        _module.args.pkgs = import inputs.nixpkgs {
-          inherit system;
-          overlays = [
-            (import inputs.emacs)
       ];
-        };
-
-        packages = builtins.mapAttrs (_: v:
-          lib.mkEmacs {
-            inherit pkgs;
-            emacs = v;
-          }) {
-          pankomacs = pkgs.emacs30-pgtk;
-          pankomacs-x11 = pkgs.emacs30-gtk3;
-        };
 
+      perSystem = {pkgs, ...}: {
         formatter = pkgs.alejandra;
       };
     };

lib.nix

@@ -1,8 +1,5 @@
-final: prev: {
+{inputs, ...}: {
-  mkEmacs = {
+  flake.lib = inputs.nixpkgs.lib.extend (_: _: let
-    pkgs,
-    emacs,
-  }: let
     mkEmacsPackage = {
       epkgs,
       pname,
@@ -18,8 +15,12 @@ final: prev: {
             propagatedUserEnvPkgs = deps;
           }
       ) {inherit (epkgs) trivialBuild;};
-  in
+
-    pkgs.emacsWithPackagesFromUsePackage {
+    mkEmacs = {
+      pkgs,
+      emacs,
+    }:
+      (pkgs.appendOverlays [inputs.emacs.overlays.default]).emacsWithPackagesFromUsePackage {
         package = emacs;
         defaultInitFile = true;
         config = ./config.el;
@@ -46,4 +47,7 @@ final: prev: {
           savehist = prev.emacs;
         };
       };
+  in {
+    inherit mkEmacs mkEmacsPackage;
+  });
 }