modules: inject nixpkgs source as a special arg

docs/default.nix

@@ -1,6 +1,6 @@
 # Copyright (c) 2019-2023, see AUTHORS. Licensed under MIT License, see LICENSE.
 
-{ pkgs, home-manager, nmdSrc }:
+{ pkgs, nixpkgs, home-manager, nmdSrc }:
 
 let
   nmd = import nmdSrc { inherit pkgs; };
@@ -14,7 +14,7 @@ let
   };
 
   modules = import ../modules/module-list.nix {
-    inherit pkgs;
+    inherit pkgs nixpkgs;
     home-manager-path = home-manager.outPath;
     isFlake = true;
   };

flake.nix

@@ -25,7 +25,7 @@
     };
   };
 
-  outputs = { self, nixpkgs, nixpkgs-for-bootstrap, home-manager, nix-formatter-pack, nmd }:
+  outputs = { self, nixpkgs, nixpkgs-for-bootstrap, home-manager, nix-formatter-pack, nmd }@inputs:
     let
       forEachSystem = nixpkgs.lib.genAttrs [ "aarch64-linux" "x86_64-linux" ];
 
@@ -80,6 +80,7 @@
         { modules ? [ ]
         , extraSpecialArgs ? { }
         , pkgs ? pkgs'
+        , nixpkgs ? inputs.nixpkgs
         , home-manager-path ? home-manager.outPath
           # deprecated:
         , config ? null
@@ -103,7 +104,7 @@
               See the 22.11 release notes for more.
             ''
             (import ./modules {
-              inherit extraSpecialArgs home-manager-path pkgs;
+              inherit extraSpecialArgs home-manager-path nixpkgs pkgs;
               config.imports = modules;
               isFlake = true;
             });
@@ -118,7 +119,7 @@
           };
 
           docs = import ./docs {
-            inherit home-manager;
+            inherit nixpkgs home-manager;
             pkgs = nixpkgs.legacyPackages.${system};
             nmdSrc = nmd;
           };

modules/default.nix

@@ -3,6 +3,7 @@
 { config ? null
 , extraSpecialArgs ? { }
 , pkgs ? import <nixpkgs> { }
+, nixpkgs ? <nixpkgs>
 , home-manager-path ? <home-manager>
 , isFlake ? false
 }:
@@ -21,7 +22,7 @@ let
 
   rawModule = evalModules {
     modules = [ configModule ] ++ nodModules;
-    specialArgs = extraSpecialArgs;
+    specialArgs = { inherit nixpkgs; } // extraSpecialArgs;
   };
 
   failedAssertions = map (x: x.message) (filter (x: !x.assertion) rawModule.config.assertions);