switch formatting to nixpkgs-fmt

docs/default.nix

@@ -1,14 +1,10 @@
 # adapted from: https://discourse.nixos.org/t/franken-script-to-generate-nixos-options-docs-with-custom-modules/1674/4
-{
-  pkgs,
-  options,
-}: let
-  extraSources = [];
+{ pkgs, options }:
+let
+  extraSources = [ ];
   lib = pkgs.lib;
 
-  optionsListVisible =
-    lib.filter (opt: opt.visible && !opt.internal)
-    (lib.optionAttrSetToDocList options);
+  optionsListVisible = lib.filter (opt: opt.visible && !opt.internal) (lib.optionAttrSetToDocList options);
 
   # Replace functions by the string <function>
   substFunction = x:
@@ -24,78 +20,75 @@
 
   isPath = x: (builtins.typeOf x) == "path";
 
-  optionsListDesc = lib.flip map optionsListVisible (
-    opt:
-      opt
-      // {
-        description = let
+  optionsListDesc = lib.flip map optionsListVisible (opt:
+    opt // {
+      description =
+        let
           attempt = builtins.tryEval opt.description;
         in
-          if attempt.success
-          then attempt.value
-          else "N/A";
-        declarations = map stripAnyPrefixes opt.declarations;
-      }
-      // lib.optionalAttrs (opt ? example) {
-        example = substFunction opt.example;
-      }
-      // lib.optionalAttrs (opt ? default) {
-        default = substFunction opt.default;
-      }
-      // lib.optionalAttrs (opt ? type) {
-        type = substFunction opt.type;
-      }
-      // lib.optionalAttrs
-      (opt ? relatedPackages && opt.relatedPackages != [])
-      {
-        relatedPackages = genRelatedPackages opt.relatedPackages;
-      }
+        if attempt.success
+        then attempt.value
+        else "N/A";
+      declarations = map stripAnyPrefixes opt.declarations;
+    } // lib.optionalAttrs (opt ? example) {
+      example = substFunction opt.example;
+    } // lib.optionalAttrs (opt ? default) {
+      default = substFunction opt.default;
+    } // lib.optionalAttrs (opt ? type) {
+      type = substFunction opt.type;
+    } // lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != [ ]) {
+      relatedPackages = genRelatedPackages opt.relatedPackages;
+    }
   );
 
-  genRelatedPackages = packages: let
-    unpack = p:
-      if lib.isString p
-      then {name = p;}
-      else if lib.isList p
-      then {path = p;}
-      else p;
-    describe = args: let
-      title = args.title or null;
-      name = args.name or (lib.concatStringsSep "." args.path);
-      path = args.path or [args.name];
-      package =
-        args.package
-        or (lib.attrByPath path
-          (throw
-            "Invalid package attribute path '${toString path}'")
-          pkgs);
-    in
-      "<listitem>"
-      + "<para><literal>${lib.optionalString (title != null)
+  genRelatedPackages = packages:
+    let
+      unpack = p:
+        if lib.isString p
+        then { name = p; }
+        else if lib.isList p
+        then { path = p; }
+        else p;
+      describe = args:
+        let
+          title = args.title or null;
+          name = args.name or (lib.concatStringsSep "." args.path);
+          path = args.path or [ args.name ];
+          package =
+            args.package
+              or (lib.attrByPath path
+              (throw
+                "Invalid package attribute path '${toString path}'")
+              pkgs);
+        in
+        "<listitem>"
+        + "<para><literal>${lib.optionalString (title != null)
         "${title} aka "}pkgs.${name} (${package.meta.name})</literal>"
-      + lib.optionalString (!package.meta.available)
-      " <emphasis>[UNAVAILABLE]</emphasis>"
-      + ": ${package.meta.description or "???"}.</para>"
-      + lib.optionalString (args ? comment)
-      "\n<para>${args.comment}</para>"
-      + lib.optionalString (package.meta ? longDescription)
-      "\n<programlisting>${package.meta.longDescription}"
-      + "</programlisting>"
-      + "</listitem>";
-  in "<itemizedlist>${lib.concatStringsSep "\n" (map (p:
+        + lib.optionalString (!package.meta.available)
+          " <emphasis>[UNAVAILABLE]</emphasis>"
+        + ": ${package.meta.description or "???"}.</para>"
+        + lib.optionalString (args ? comment)
+          "\n<para>${args.comment}</para>"
+        + lib.optionalString (package.meta ? longDescription)
+          "\n<programlisting>${package.meta.longDescription}"
+        + "</programlisting>"
+        + "</listitem>";
+    in
+    "<itemizedlist>${lib.concatStringsSep "\n" (map (p:
     describe (unpack p))
   packages)}</itemizedlist>";
 
-  optionLess = a: b: let
-    ise = lib.hasPrefix "enable";
-    isp = lib.hasPrefix "package";
-    cmp =
-      lib.splitByAndCompare ise lib.compare
-      (lib.splitByAndCompare isp lib.compare lib.compare);
-  in
+  optionLess = a: b:
+    let
+      ise = lib.hasPrefix "enable";
+      isp = lib.hasPrefix "package";
+      cmp =
+        lib.splitByAndCompare ise lib.compare
+          (lib.splitByAndCompare isp lib.compare lib.compare);
+    in
     lib.compareLists cmp a.loc b.loc < 0;
 
-  prefixesToStrip = map (p: "${toString p}/") ([../../..] ++ extraSources);
+  prefixesToStrip = map (p: "${toString p}/") ([ ../../.. ] ++ extraSources);
   stripAnyPrefixes = lib.flip (lib.fold lib.removePrefix) prefixesToStrip;
 
   ###############################################################################
@@ -119,4 +112,4 @@
       })
       optionsList)));
 in
-  pkgs.writeText "options.json" optionsJSON
+pkgs.writeText "options.json" optionsJSON