Split documentation into each file

docs/default.nix

@@ -1,32 +1,41 @@
 # with friendly help by stylix: https://github.com/danth/stylix/blob/master/docs/default.nix
-{ pkgs, build_systems, ... }:
-
+{
+  pkgs,
+  build_systems,
+  lib,
+  ...
+}:
 let
-  makeOptionsDoc =
-    configuration:
-    pkgs.nixosOptionsDoc {
-      inherit (configuration) options;
-
-      # Filter out any options not beginning with `stylix`
-      transformOptions =
-        option:
-        option
-        // {
-          visible =
-            builtins.elemAt option.loc 0 != "kernel"
-            && option.visible
-            && (builtins.elemAt option.loc 0 == "conf" || builtins.elemAt option.loc 0 == "mods");
-        };
-    };
-  example = makeOptionsDoc (build_systems [ "example" ] ../example/.)."example";
+  makeOptionsDoc = configuration: pkgs.nixosOptionsDoc { options = configuration; };
+  generateDocs = obj: ''
+    touch src/${obj.fst}.md
+    sed '/*Declared by:*/,/^$/d' <${obj.snd.optionsCommonMark} >> src/${obj.fst}.md
+  '';
+  summaryAppend = name: ''
+    echo "- [${name}](${name}.md)" >> src/SUMMARY.md
+  '';
+  system = (build_systems [ "example" ] ../example/.)."example".options;
+  makeOptionsDocPrograms = name: pkgs.nixosOptionsDoc { options = system.mods.${name}; };
+  conf = makeOptionsDoc system.conf;
+  paths = builtins.readDir ../modules/programs;
+  names = lib.lists.remove "default" (
+    map (name: lib.strings.removeSuffix ".nix" name) (lib.attrsets.mapAttrsToList (name: _: name) paths)
+  );
+  mods = map makeOptionsDocPrograms names;
+  docs = lib.strings.concatLines (map generateDocs (lib.lists.zipLists names mods));
+  summary = lib.strings.concatStringsSep " " (map summaryAppend names);
 in
 pkgs.stdenvNoCC.mkDerivation {
   name = "dashNix-book";
   src = ./.;
 
   patchPhase = ''
-    sed '/*Declared by:*/,/^$/d' <${example.optionsCommonMark} >> src/dashNix.md
+    sed '/*Declared by:*/,/^$/d' <${conf.optionsCommonMark} >> src/conf.md
+    ${docs}
+    echo "[README](README.md)\n # Options\n - [Base Config](conf.md)" >> src/SUMMARY.md
+    ${summary}
   '';
+
   buildPhase = ''
     ${pkgs.mdbook}/bin/mdbook build --dest-dir $out
   '';