refactor(flake): only use lib, reduce imports

flake.nix

@@ -11,40 +11,19 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
-  outputs = inputs: let
-    lib = inputs.nixpkgs.lib.extend (import ./lib.nix);
-  in
+  outputs = inputs:
     inputs.parts.lib.mkFlake {
       inherit inputs;
-      specialArgs.lib = lib;
     } {
       systems = [
         "x86_64-linux"
       ];
 
-      perSystem = {
-        pkgs,
-        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;
-        };
+      imports = [
+        ./lib.nix
+      ];
 
+      perSystem = {pkgs, ...}: {
         formatter = pkgs.alejandra;
       };
     };

lib.nix

@@ -1,8 +1,5 @@
-final: prev: {
-  mkEmacs = {
-    pkgs,
-    emacs,
-  }: let
+{inputs, ...}: {
+  flake.lib = inputs.nixpkgs.lib.extend (_: _: let
     mkEmacsPackage = {
       epkgs,
       pname,
@@ -18,32 +15,39 @@ final: prev: {
             propagatedUserEnvPkgs = deps;
           }
       ) {inherit (epkgs) trivialBuild;};
-  in
-    pkgs.emacsWithPackagesFromUsePackage {
-      package = emacs;
-      defaultInitFile = true;
-      config = ./config.el;
-      extraEmacsPackages = epkgs:
-        builtins.attrValues {
-          inherit
-            (epkgs)
-            spacious-padding
-            mood-line
-            which-key
-            helm
-            base16-theme
-            nix-mode
-            rust-mode
-            haskell-mode
-            envrc
-            eat
-            vterm
-            ;
-          treesit-grammars = epkgs.treesit-grammars.with-all-grammars;
+
+    mkEmacs = {
+      pkgs,
+      emacs,
+    }:
+      (pkgs.appendOverlays [inputs.emacs.overlays.default]).emacsWithPackagesFromUsePackage {
+        package = emacs;
+        defaultInitFile = true;
+        config = ./config.el;
+        extraEmacsPackages = epkgs:
+          builtins.attrValues {
+            inherit
+              (epkgs)
+              spacious-padding
+              mood-line
+              which-key
+              helm
+              base16-theme
+              nix-mode
+              rust-mode
+              haskell-mode
+              envrc
+              eat
+              vterm
+              ;
+            treesit-grammars = epkgs.treesit-grammars.with-all-grammars;
+          };
+        override = _: prev: {
+          use-package = prev.emacs;
+          savehist = prev.emacs;
         };
-      override = _: prev: {
-        use-package = prev.emacs;
-        savehist = prev.emacs;
       };
-    };
+  in {
+    inherit mkEmacs mkEmacsPackage;
+  });
 }