lib: separate eval config file

Move the `homeManagerConfiguration` function into its own file to allow
importing without passing an unused `lib` argument.

lib/default.nix

@@ -2,38 +2,5 @@
 {
   inherit ((import ../modules/lib/stdlib-extended.nix lib)) hm;
 
-  homeManagerConfiguration =
-    {
-      check ? true,
-      extraSpecialArgs ? { },
-      lib ? pkgs.lib,
-      modules ? [ ],
-      pkgs,
-      minimal ? false,
-    }:
-    import ../modules {
-      inherit
-        check
-        extraSpecialArgs
-        lib
-        pkgs
-        minimal
-        ;
-      configuration = {
-        imports = modules ++ [
-          {
-            programs.home-manager.path = builtins.path {
-              path = ../.;
-              name = "source";
-            };
-          }
-        ];
-
-        nixpkgs = {
-          config = lib.mkDefault pkgs.config;
-
-          inherit (pkgs) overlays;
-        };
-      };
-    };
+  homeManagerConfiguration = import ./eval-config.nix;
 }

lib/eval-config.nix

@@ -0,0 +1,33 @@
+{
+  check ? true,
+  extraSpecialArgs ? { },
+  lib ? pkgs.lib,
+  modules ? [ ],
+  pkgs,
+  minimal ? false,
+}:
+import ../modules {
+  inherit
+    check
+    extraSpecialArgs
+    lib
+    pkgs
+    minimal
+    ;
+  configuration = {
+    imports = modules ++ [
+      {
+        programs.home-manager.path = builtins.path {
+          path = ../.;
+          name = "source";
+        };
+      }
+    ];
+
+    nixpkgs = {
+      config = lib.mkDefault pkgs.config;
+
+      inherit (pkgs) overlays;
+    };
+  };
+}