doc: pull option docs out of doc-support

this leaves doc-support as a simple wrapper around function docs. this
wrapper will go away very soon as well.

doc/default.nix

@@ -1,5 +1,8 @@
 { pkgs ? (import ./.. { }), nixpkgs ? { }}:
 let
+  inherit (pkgs) lib;
+  inherit (lib) hasPrefix removePrefix;
+
   doc-support = import ./doc-support { inherit pkgs nixpkgs; };
 
   epub = pkgs.runCommand "manual.epub" {
@@ -43,6 +46,28 @@ let
     zip -0Xq "$out" mimetype
     cd scratch && zip -Xr9D "$out" *
   '';
+
+  # NB: This file describes the Nixpkgs manual, which happens to use module
+  #     docs infra originally developed for NixOS.
+  optionsDoc = pkgs.nixosOptionsDoc {
+    inherit (pkgs.lib.evalModules {
+      modules = [ ../pkgs/top-level/config.nix ];
+      class = "nixpkgsConfig";
+    }) options;
+    documentType = "none";
+    transformOptions = opt:
+      opt // {
+        declarations =
+          map
+            (decl:
+              if hasPrefix (toString ../..) (toString decl)
+              then
+                let subpath = removePrefix "/" (removePrefix (toString ../.) (toString decl));
+                in { url = "https://github.com/NixOS/nixpkgs/blob/master/${subpath}"; name = subpath; }
+              else decl)
+            opt.declarations;
+        };
+  };
 in pkgs.stdenv.mkDerivation {
   name = "nixpkgs-manual";
 
@@ -54,6 +79,7 @@ in pkgs.stdenv.mkDerivation {
 
   postPatch = ''
     ln -s ${doc-support} ./doc-support/result
+    ln -s ${optionsDoc.optionsJSON}/share/doc/nixos/options.json ./config-options.json
   '';
 
   buildPhase = ''

doc/doc-support/default.nix

@@ -1,8 +1,5 @@
 { pkgs ? (import ../.. {}), nixpkgs ? { }}:
 let
-  inherit (pkgs) lib;
-  inherit (lib) hasPrefix removePrefix;
-
   libsets = [
     { name = "asserts"; description = "assertion functions"; }
     { name = "attrsets"; description = "attribute set functions"; }
@@ -19,29 +16,6 @@ let
   ];
 
   functionDocs = import ./lib-function-docs.nix { inherit pkgs nixpkgs libsets; };
-  version = pkgs.lib.version;
-
-  # NB: This file describes the Nixpkgs manual, which happens to use module
-  #     docs infra originally developed for NixOS.
-  optionsDoc = pkgs.nixosOptionsDoc {
-    inherit (pkgs.lib.evalModules {
-      modules = [ ../../pkgs/top-level/config.nix ];
-      class = "nixpkgsConfig";
-    }) options;
-    documentType = "none";
-    transformOptions = opt:
-      opt // {
-        declarations =
-          map
-            (decl:
-              if hasPrefix (toString ../..) (toString decl)
-              then
-                let subpath = removePrefix "/" (removePrefix (toString ../..) (toString decl));
-                in { url = "https://github.com/NixOS/nixpkgs/blob/master/${subpath}"; name = subpath; }
-              else decl)
-            opt.declarations;
-        };
-  };
 
 in pkgs.runCommand "doc-support" {}
 ''
@@ -49,7 +23,6 @@ in pkgs.runCommand "doc-support" {}
   (
     cd result
     ln -s ${functionDocs} ./function-docs
-    ln -s ${optionsDoc.optionsJSON} ./config-options.json
   )
   mv result $out
 ''

doc/using/configuration.chapter.md

@@ -188,7 +188,7 @@ The following attributes can be passed in [`config`](#chap-packageconfig).
 ```{=include=} options
 id-prefix: opt-
 list-id: configuration-variable-list
-source: ../doc-support/result/config-options.json/share/doc/nixos/options.json
+source: ../config-options.json
 ```