doc: render nixpkgs manual with nrd

also updates nixdoc to 2.3.0. the nixdoc update is not a separate commit
because that would leave the manual build broken for one commit,
potentially breaking bisects and rebases.

doc/Makefile

···
-MD_TARGETS=$(addsuffix .xml, $(basename $(shell find . -type f -regex '.*\.md$$' -not -name README.md)))
-
-PANDOC ?= pandoc
-
-pandoc_media_dir = media
-# NOTE: Keep in sync with conversion script (/maintainers/scripts/db-to-md.sh).
-# TODO: Remove raw-attribute when we can get rid of DocBook altogether.
-pandoc_commonmark_enabled_extensions = +attributes+fenced_divs+footnotes+bracketed_spans+definition_lists+pipe_tables+raw_attribute
-# Not needed:
-# - docbook-reader/citerefentry-to-rst-role.lua (only relevant for DocBook → MarkDown/rST/MyST)
-pandoc_flags = --extract-media=$(pandoc_media_dir) \
-	--lua-filter=$(PANDOC_LUA_FILTERS_DIR)/diagram-generator.lua \
-	--lua-filter=build-aux/pandoc-filters/myst-reader/roles.lua \
-	--lua-filter=$(PANDOC_LINK_MANPAGES_FILTER) \
-	--lua-filter=build-aux/pandoc-filters/docbook-writer/rst-roles.lua \
-	--lua-filter=build-aux/pandoc-filters/docbook-writer/labelless-link-is-xref.lua \
-	-f commonmark$(pandoc_commonmark_enabled_extensions)+smart
-
-.PHONY: all
-all: validate format out/html/index.html
-
-.PHONY: render-md
-render-md: ${MD_TARGETS}
-
-.PHONY: debug
-debug:
-	nix-shell --run "xmloscopy --docbook5 ./manual.xml ./manual-full.xml"
-
-.PHONY: format
-format: doc-support/result
-	find . -iname '*.xml' -type f | while read f; do \
-		echo $$f ;\
-		xmlformat --config-file "doc-support/result/xmlformat.conf" -i $$f ;\
-	done
-
-.PHONY: fix-misc-xml
-fix-misc-xml:
-	find . -iname '*.xml' -type f \
-		-exec ../nixos/doc/varlistentry-fixer.rb {} ';'
-
-.PHONY: clean
-clean:
-	rm -f ${MD_TARGETS} doc-support/result .version manual-full.xml functions/library/locations.xml functions/library/generated
-	rm -rf ./out/ ./highlightjs ./media
-
-.PHONY: validate
-validate: manual-full.xml doc-support/result
-	jing doc-support/result/docbook.rng manual-full.xml
-
-out/html/index.html: doc-support/result manual-full.xml style.css highlightjs
-	mkdir -p out/html
-	xsltproc \
-		--nonet --xinclude \
-		--output $@ \
-		doc-support/result/xhtml.xsl \
-		./manual-full.xml
-
-	mkdir -p out/html/highlightjs/
-	cp -r highlightjs out/html/
-
-	cp -r $(pandoc_media_dir) out/html/
-	cp ./overrides.css out/html/
-	cp ./style.css out/html/style.css
-
-	mkdir -p out/html/images/callouts
-	cp doc-support/result/xsl/docbook/images/callouts/*.svg out/html/images/callouts/
-	chmod u+w -R out/html/
-
-highlightjs: doc-support/result
-	mkdir -p highlightjs
-	cp -r doc-support/result/highlightjs/highlight.pack.js highlightjs/
-	cp -r doc-support/result/highlightjs/LICENSE highlightjs/
-	cp -r doc-support/result/highlightjs/mono-blue.css highlightjs/
-	cp -r doc-support/result/highlightjs/loader.js highlightjs/
-
-
-manual-full.xml: ${MD_TARGETS} .version functions/library/locations.xml functions/library/generated *.xml **/*.xml **/**/*.xml
-	xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
-
-.version: doc-support/result
-	ln -rfs ./doc-support/result/version .version
-
-doc-support/result: doc-support/default.nix
-	(cd doc-support; nix-build)
-
-functions/library/locations.xml: doc-support/result
-	ln -rfs ./doc-support/result/function-locations.xml functions/library/locations.xml
-
-functions/library/generated: doc-support/result
-	ln -rfs ./doc-support/result/function-docs functions/library/generated
-
-%.section.xml: %.section.md
-	$(PANDOC) $^ -t docbook \
-		$(pandoc_flags) \
-		-o $@
-
-%.chapter.xml: %.chapter.md
-	$(PANDOC) $^ -t docbook \
-		--top-level-division=chapter \
-		$(pandoc_flags) \
-		-o $@

doc/builders.md

···
+# Builders {#part-builders}
+
+```{=include=} chapters
+builders/fetchers.chapter.md
+builders/trivial-builders.chapter.md
+builders/testers.chapter.md
+builders/special.md
+builders/images.md
+hooks/index.md
+languages-frameworks/index.md
+builders/packages/index.md
+```

doc/builders/images.md

···
+# Images {#chap-images}
+
+This chapter describes tools for creating various types of images.
+
+```{=include=} sections
+images/appimagetools.section.md
+images/dockertools.section.md
+images/ocitools.section.md
+images/snaptools.section.md
+images/portableservice.section.md
+images/makediskimage.section.md
+images/binarycache.section.md
+```

doc/builders/images.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-images">
- <title>Images</title>
- <para>
-  This chapter describes tools for creating various types of images.
- </para>
- <xi:include href="images/appimagetools.section.xml" />
- <xi:include href="images/dockertools.section.xml" />
- <xi:include href="images/ocitools.section.xml" />
- <xi:include href="images/snaptools.section.xml" />
- <xi:include href="images/portableservice.section.xml" />
- <xi:include href="images/makediskimage.section.xml" />
- <xi:include href="images/binarycache.section.xml" />
-</chapter>

doc/builders/packages/dlib.section.md

···
 # DLib {#dlib}
 
-[DLib](http://dlib.net/) is a modern, C++-based toolkit which provides several machine learning algorithms.
+[DLib](http://dlib.net/) is a modern, C++\-based toolkit which provides several machine learning algorithms.
 
 ## Compiling without AVX support {#compiling-without-avx-support}
 

doc/builders/packages/index.md

···
+# Packages {#chap-packages}
+
+This chapter contains information about how to use and maintain the Nix expressions for a number of specific packages, such as the Linux kernel or X.org.
+
+```{=include=} sections
+citrix.section.md
+dlib.section.md
+eclipse.section.md
+elm.section.md
+emacs.section.md
+firefox.section.md
+fish.section.md
+fuse.section.md
+ibus.section.md
+kakoune.section.md
+linux.section.md
+locales.section.md
+etc-files.section.md
+nginx.section.md
+opengl.section.md
+shell-helpers.section.md
+steam.section.md
+cataclysm-dda.section.md
+urxvt.section.md
+weechat.section.md
+xorg.section.md
+```

doc/builders/packages/index.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-packages">
- <title>Packages</title>
- <para>
-  This chapter contains information about how to use and maintain the Nix expressions for a number of specific packages, such as the Linux kernel or X.org.
- </para>
- <xi:include href="citrix.section.xml" />
- <xi:include href="dlib.section.xml" />
- <xi:include href="eclipse.section.xml" />
- <xi:include href="elm.section.xml" />
- <xi:include href="emacs.section.xml" />
- <xi:include href="firefox.section.xml" />
- <xi:include href="fish.section.xml" />
- <xi:include href="fuse.section.xml" />
- <xi:include href="ibus.section.xml" />
- <xi:include href="kakoune.section.xml" />
- <xi:include href="linux.section.xml" />
- <xi:include href="locales.section.xml" />
- <xi:include href="etc-files.section.xml" />
- <xi:include href="nginx.section.xml" />
- <xi:include href="opengl.section.xml" />
- <xi:include href="shell-helpers.section.xml" />
- <xi:include href="steam.section.xml" />
- <xi:include href="cataclysm-dda.section.xml" />
- <xi:include href="urxvt.section.xml" />
- <xi:include href="weechat.section.xml" />
- <xi:include href="xorg.section.xml" />
-</chapter>

doc/builders/special.md

···
+# Special builders {#chap-special}
+
+This chapter describes several special builders.
+
+```{=include=} sections
+special/fhs-environments.section.md
+special/makesetuphook.section.md
+special/mkshell.section.md
+special/darwin-builder.section.md
+special/vm-tools.section.md
+```

doc/builders/special.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-special">
- <title>Special builders</title>
- <para>
-  This chapter describes several special builders.
- </para>
- <xi:include href="special/fhs-environments.section.xml" />
- <xi:include href="special/makesetuphook.section.xml" />
- <xi:include href="special/mkshell.section.xml" />
- <xi:include href="special/darwin-builder.section.xml" />
- <xi:include href="special/vm-tools.section.xml" />
-</chapter>

doc/contributing.md

···
+# Contributing to Nixpkgs {#part-contributing}
+
+```{=include=} chapters
+contributing/quick-start.chapter.md
+contributing/coding-conventions.chapter.md
+contributing/submitting-changes.chapter.md
+contributing/vulnerability-roundup.chapter.md
+contributing/reviewing-contributions.chapter.md
+contributing/contributing-to-documentation.chapter.md
+```

doc/contributing/staging-workflow.dot

···
+digraph {
+    "small changes" [shape=none]
+    "mass-rebuilds and other large changes" [shape=none]
+    "critical security fixes" [shape=none]
+    "broken staging-next fixes" [shape=none]
+
+    "small changes" -> master
+    "mass-rebuilds and other large changes" -> staging
+    "critical security fixes" -> master
+    "broken staging-next fixes" -> "staging-next"
+
+    "staging-next" -> master [color="#E85EB0"] [label="stabilization ends"] [fontcolor="#E85EB0"]
+    "staging" -> "staging-next" [color="#E85EB0"] [label="stabilization starts"] [fontcolor="#E85EB0"]
+
+    master -> "staging-next" -> staging [color="#5F5EE8"] [label="every six hours (GitHub Action)"] [fontcolor="#5F5EE8"]
+}

doc/contributing/staging-workflow.svg

···
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 7.1.0 (0)
+ -->
+<!-- Pages: 1 -->
+<svg width="743pt" height="291pt"
+ viewBox="0.00 0.00 743.00 291.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 287)">
+<polygon fill="white" stroke="none" points="-4,4 -4,-287 739,-287 739,4 -4,4"/>
+<!-- small changes -->
+<g id="node1" class="node">
+<title>small changes</title>
+<text text-anchor="middle" x="59" y="-261.3" font-family="Times,serif" font-size="14.00">small changes</text>
+</g>
+<!-- master -->
+<g id="node5" class="node">
+<title>master</title>
+<ellipse fill="none" stroke="black" cx="139" cy="-192" rx="43.59" ry="18"/>
+<text text-anchor="middle" x="139" y="-188.3" font-family="Times,serif" font-size="14.00">master</text>
+</g>
+<!-- small changes&#45;&gt;master -->
+<g id="edge1" class="edge">
+<title>small changes&#45;&gt;master</title>
+<path fill="none" stroke="black" d="M77.96,-247.17C88.42,-237.89 101.55,-226.23 112.96,-216.11"/>
+<polygon fill="black" stroke="black" points="114.99,-218.99 120.14,-209.74 110.34,-213.76 114.99,-218.99"/>
+</g>
+<!-- mass&#45;rebuilds and other large changes -->
+<g id="node2" class="node">
+<title>mass&#45;rebuilds and other large changes</title>
+<text text-anchor="middle" x="588" y="-101.3" font-family="Times,serif" font-size="14.00">mass&#45;rebuilds and other large changes</text>
+</g>
+<!-- staging -->
+<g id="node6" class="node">
+<title>staging</title>
+<ellipse fill="none" stroke="black" cx="438" cy="-18" rx="45.49" ry="18"/>
+<text text-anchor="middle" x="438" y="-14.3" font-family="Times,serif" font-size="14.00">staging</text>
+</g>
+<!-- mass&#45;rebuilds and other large changes&#45;&gt;staging -->
+<g id="edge2" class="edge">
+<title>mass&#45;rebuilds and other large changes&#45;&gt;staging</title>
+<path fill="none" stroke="black" d="M587.48,-87.47C586.26,-76.55 582.89,-62.7 574,-54 553.19,-33.63 522.2,-24.65 495.05,-20.86"/>
+<polygon fill="black" stroke="black" points="495.53,-17.39 485.2,-19.71 494.72,-24.35 495.53,-17.39"/>
+</g>
+<!-- critical security fixes -->
+<g id="node3" class="node">
+<title>critical security fixes</title>
+<text text-anchor="middle" x="219" y="-261.3" font-family="Times,serif" font-size="14.00">critical security fixes</text>
+</g>
+<!-- critical security fixes&#45;&gt;master -->
+<g id="edge3" class="edge">
+<title>critical security fixes&#45;&gt;master</title>
+<path fill="none" stroke="black" d="M200.04,-247.17C189.58,-237.89 176.45,-226.23 165.04,-216.11"/>
+<polygon fill="black" stroke="black" points="167.66,-213.76 157.86,-209.74 163.01,-218.99 167.66,-213.76"/>
+</g>
+<!-- broken staging&#45;next fixes -->
+<g id="node4" class="node">
+<title>broken staging&#45;next fixes</title>
+<text text-anchor="middle" x="414" y="-188.3" font-family="Times,serif" font-size="14.00">broken staging&#45;next fixes</text>
+</g>
+<!-- staging&#45;next -->
+<g id="node7" class="node">
+<title>staging&#45;next</title>
+<ellipse fill="none" stroke="black" cx="272" cy="-105" rx="68.79" ry="18"/>
+<text text-anchor="middle" x="272" y="-101.3" font-family="Times,serif" font-size="14.00">staging&#45;next</text>
+</g>
+<!-- broken staging&#45;next fixes&#45;&gt;staging&#45;next -->
+<g id="edge4" class="edge">
+<title>broken staging&#45;next fixes&#45;&gt;staging&#45;next</title>
+<path fill="none" stroke="black" d="M410.2,-174.42C406.88,-163.48 400.98,-149.62 391,-141 377.77,-129.56 360.96,-121.86 344.17,-116.67"/>
+<polygon fill="black" stroke="black" points="345.21,-113.33 334.63,-114.02 343.33,-120.07 345.21,-113.33"/>
+</g>
+<!-- master&#45;&gt;staging&#45;next -->
+<g id="edge7" class="edge">
+<title>master&#45;&gt;staging&#45;next</title>
+<path fill="none" stroke="#5f5ee8" d="M96.55,-187.26C53.21,-181.83 -4.5,-169.14 20,-141 41.99,-115.74 126.36,-108.13 191.48,-106.11"/>
+<polygon fill="#5f5ee8" stroke="#5f5ee8" points="191.57,-109.61 201.47,-105.85 191.38,-102.62 191.57,-109.61"/>
+<text text-anchor="middle" x="133" y="-144.8" font-family="Times,serif" font-size="14.00" fill="#5f5ee8">every six hours (GitHub Action)</text>
+</g>
+<!-- staging&#45;&gt;staging&#45;next -->
+<g id="edge6" class="edge">
+<title>staging&#45;&gt;staging&#45;next</title>
+<path fill="none" stroke="#e85eb0" d="M434.55,-36.2C431.48,-47.12 425.89,-60.72 416,-69 397.61,-84.41 373.51,-93.23 350.31,-98.23"/>
+<polygon fill="#e85eb0" stroke="#e85eb0" points="349.67,-94.79 340.5,-100.1 350.98,-101.66 349.67,-94.79"/>
+<text text-anchor="middle" x="493.5" y="-57.8" font-family="Times,serif" font-size="14.00" fill="#e85eb0">stabilization starts</text>
+</g>
+<!-- staging&#45;next&#45;&gt;master -->
+<g id="edge5" class="edge">
+<title>staging&#45;next&#45;&gt;master</title>
+<path fill="none" stroke="#e85eb0" d="M268.22,-123.46C265.05,-134.22 259.46,-147.52 250,-156 233.94,-170.4 211.98,-178.87 191.83,-183.86"/>
+<polygon fill="#e85eb0" stroke="#e85eb0" points="191.35,-180.38 182.34,-185.96 192.86,-187.22 191.35,-180.38"/>
+<text text-anchor="middle" x="323.5" y="-144.8" font-family="Times,serif" font-size="14.00" fill="#e85eb0">stabilization ends</text>
+</g>
+<!-- staging&#45;next&#45;&gt;staging -->
+<g id="edge8" class="edge">
+<title>staging&#45;next&#45;&gt;staging</title>
+<path fill="none" stroke="#5f5ee8" d="M221.07,-92.46C194.72,-84.14 170.92,-71.32 186,-54 210.78,-25.54 314.74,-19.48 381.15,-18.6"/>
+<polygon fill="#5f5ee8" stroke="#5f5ee8" points="380.79,-22.1 390.76,-18.51 380.73,-15.1 380.79,-22.1"/>
+<text text-anchor="middle" x="299" y="-57.8" font-family="Times,serif" font-size="14.00" fill="#5f5ee8">every six hours (GitHub Action)</text>
+</g>
+</g>
+</svg>

doc/contributing/submitting-changes.chapter.md

···
 - Hydra builds for master and staging should not be used as testing platform, it’s a build farm for changes that have been already tested.
 - When changing the bootloader installation process, extra care must be taken. Grub installations cannot be rolled back, hence changes may break people’s installations forever. For any non-trivial change to the bootloader please file a PR asking for review, especially from \@edolstra.
 
-```{.graphviz caption="Staging workflow"}
-digraph {
-    "small changes" [shape=none]
-    "mass-rebuilds and other large changes" [shape=none]
-    "critical security fixes" [shape=none]
-    "broken staging-next fixes" [shape=none]
-
-    "small changes" -> master
-    "mass-rebuilds and other large changes" -> staging
-    "critical security fixes" -> master
-    "broken staging-next fixes" -> "staging-next"
-
-    "staging-next" -> master [color="#E85EB0"] [label="stabilization ends"] [fontcolor="#E85EB0"]
-    "staging" -> "staging-next" [color="#E85EB0"] [label="stabilization starts"] [fontcolor="#E85EB0"]
-
-    master -> "staging-next" -> staging [color="#5F5EE8"] [label="every six hours (GitHub Action)"] [fontcolor="#5F5EE8"]
-}
-```
+::: {.figure #fig-staging-workflow}
+# Staging workflow
+<!-- generated from ./staging-workflow.dot using: dot -Tsvg staging-workflow.dot > staging-workflow.svg -->
+![Staging workflow](./staging-workflow.svg)
+:::
 
 [This GitHub Action](https://github.com/NixOS/nixpkgs/blob/master/.github/workflows/periodic-merge-6h.yml) brings changes from `master` to `staging-next` and from `staging-next` to `staging` every 6 hours; these are the blue arrows in the diagram above.  The purple arrows in the diagram above are done manually and much less frequently.  You can get an idea of how often these merges occur by looking at the git history.
 

doc/default.nix

···
   name = "nixpkgs-manual";
 
   nativeBuildInputs = with pkgs; [
-    pandoc
-    graphviz
-    libxml2
-    libxslt
-    zip
-    jing
-    xmlformat
+    nixos-render-docs
   ];
 
   src = pkgs.nix-gitignore.gitignoreSource [] ./.;
···
     ln -s ${doc-support} ./doc-support/result
   '';
 
-  preBuild = ''
-    make -j$NIX_BUILD_CORES render-md
+  buildPhase = ''
+    cat \
+      ./functions/library.md.in \
+      ./doc-support/result/function-docs/index.md \
+      > ./functions/library.md
+    substitute ./manual.md.in ./manual.md \
+      --replace '@MANUAL_VERSION@' '${pkgs.lib.version}'
+
+    mkdir -p out/media
+
+    mkdir -p out/highlightjs
+    cp -t out/highlightjs \
+      ${pkgs.documentation-highlighter}/highlight.pack.js \
+      ${pkgs.documentation-highlighter}/LICENSE \
+      ${pkgs.documentation-highlighter}/mono-blue.css \
+      ${pkgs.documentation-highlighter}/loader.js
+
+    cp -t out ./overrides.css ./style.css
+
+    nixos-render-docs manual html \
+      --manpage-urls ./manpage-urls.json \
+      --revision ${pkgs.lib.trivial.revisionWithDefault (pkgs.rev or "master")} \
+      --stylesheet style.css \
+      --stylesheet overrides.css \
+      --stylesheet highlightjs/mono-blue.css \
+      --script ./highlightjs/highlight.pack.js \
+      --script ./highlightjs/loader.js \
+      --toc-depth 1 \
+      --section-toc-depth 1 \
+      manual.md \
+      out/index.html
   '';
 
   installPhase = ''
     dest="$out/share/doc/nixpkgs"
     mkdir -p "$(dirname "$dest")"
-    mv out/html "$dest"
+    mv out "$dest"
     mv "$dest/index.html" "$dest/manual.html"
 
     cp ${epub} "$dest/nixpkgs-manual.epub"
···
     echo "doc manual $dest manual.html" >> $out/nix-support/hydra-build-products
     echo "doc manual $dest nixpkgs-manual.epub" >> $out/nix-support/hydra-build-products
   '';
-
-  # Environment variables
-  PANDOC_LUA_FILTERS_DIR = "${pkgs.pandoc-lua-filters}/share/pandoc/filters";
-  PANDOC_LINK_MANPAGES_FILTER = import build-aux/pandoc-filters/link-manpages.nix { inherit pkgs; };
 }

doc/doc-support/default.nix

···
   (
     cd result
     ln -s ${functionDocs} ./function-docs
-    ln -s ${optionsDoc.optionsDocBook} ./config-options.docbook.xml
+    ln -s ${optionsDoc.optionsJSON} ./config-options.json
 
     ln -s ${pkgs.docbook5}/xml/rng/docbook/docbook.rng ./docbook.rng
     ln -s ${pkgs.docbook_xsl_ns}/xml/xsl ./xsl
···
     ln -s ${xhtml-xsl} ./xhtml.xsl
 
     ln -s ${./xmlformat.conf} ./xmlformat.conf
-    ln -s ${pkgs.documentation-highlighter} ./highlightjs
-
-    echo -n "${version}" > ./version
   )
   mv result $out
 ''

doc/doc-support/lib-function-docs.nix

···
 with pkgs;
 
 let
-  locationsXml = import ./lib-function-locations.nix { inherit pkgs nixpkgs libsets; };
+  locationsJSON = import ./lib-function-locations.nix { inherit pkgs nixpkgs libsets; };
 in
 stdenv.mkDerivation {
   name = "nixpkgs-lib-docs";
···
     function docgen {
       # TODO: wrap lib.$1 in <literal>, make nixdoc not escape it
       if [[ -e "../lib/$1.nix" ]]; then
-        nixdoc -c "$1" -d "lib.$1: $2" -f "$1.nix" > "$out/$1.xml"
+        nixdoc -c "$1" -d "lib.$1: $2" -l ${locationsJSON} -f "$1.nix" > "$out/$1.md"
       else
-        nixdoc -c "$1" -d "lib.$1: $2" -f "$1/default.nix" > "$out/$1.xml"
+        nixdoc -c "$1" -d "lib.$1: $2" -l ${locationsJSON} -f "$1/default.nix" > "$out/$1.md"
       fi
-      echo "<xi:include href='$1.xml' />" >> "$out/index.xml"
+      echo "$out/$1.md" >> "$out/index.md"
     }
 
     mkdir -p "$out"
 
-    cat > "$out/index.xml" << 'EOF'
-    <?xml version="1.0" encoding="utf-8"?>
-    <root xmlns:xi="http://www.w3.org/2001/XInclude">
+    cat > "$out/index.md" << 'EOF'
+    ```{=include=} sections
     EOF
 
     ${lib.concatMapStrings ({ name, description }: ''
       docgen ${name} ${lib.escapeShellArg description}
     '') libsets}
 
-    echo "</root>" >> "$out/index.xml"
-
-    ln -s ${locationsXml} $out/locations.xml
+    echo '```' >> "$out/index.md"
   '';
 }

doc/doc-support/lib-function-locations.nix

···
     [ "-prime" ];
 
   urlPrefix = "https://github.com/NixOS/nixpkgs/blob/${revision}";
-  xmlstrings = (nixpkgsLib.strings.concatMapStrings
-      ({ name, value }:
-      ''
-      <section><title>${name}</title>
-        <para xml:id="${sanitizeId name}">
-        Located at
-        <link
-          xlink:href="${urlPrefix}/${value.file}#L${builtins.toString value.line}">${value.file}:${builtins.toString value.line}</link>
-        in  <literal>&lt;nixpkgs&gt;</literal>.
-        </para>
-        </section>
-      '')
-      relativeLocs);
+  jsonLocs = builtins.listToAttrs
+    (builtins.map
+      ({ name, value }: {
+        name = sanitizeId name;
+        value =
+          let
+            text = "${value.file}:${builtins.toString value.line}";
+            target = "${urlPrefix}/${value.file}#L${builtins.toString value.line}";
+          in
+            "[${text}](${target}) in `<nixpkgs>`";
+      })
+    relativeLocs);
 
-in pkgs.writeText
-    "locations.xml"
-    ''
-    <section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         version="5">
-         <title>All the locations for every lib function</title>
-         <para>This file is only for inclusion by other files.</para>
-         ${xmlstrings}
-    </section>
-    ''
+in
+pkgs.writeText "locations.json" (builtins.toJSON jsonLocs)

doc/functions.md

···
+# Functions reference {#chap-functions}
+
+The nixpkgs repository has several utility functions to manipulate Nix expressions.
+
+```{=include=} sections
+functions/library.md
+functions/generators.section.md
+functions/debug.section.md
+functions/prefer-remote-fetch.section.md
+functions/nix-gitignore.section.md
+```

doc/functions.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-functions">
- <title>Functions reference</title>
- <para>
-  The nixpkgs repository has several utility functions to manipulate Nix expressions.
- </para>
- <xi:include href="functions/library.xml" />
- <xi:include href="functions/generators.section.xml" />
- <xi:include href="functions/debug.section.xml" />
- <xi:include href="functions/prefer-remote-fetch.section.xml" />
- <xi:include href="functions/nix-gitignore.section.xml" />
-</chapter>

doc/functions/library.md.in

···
+# Nixpkgs Library Functions {#sec-functions-library}
+
+Nixpkgs provides a standard library at `pkgs.lib`, or through `import <nixpkgs/lib>`.
+
+<!-- nixdoc-generated documentation must be appended here during build! -->

doc/functions/library.xml

···
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-functions-library">
- <title>Nixpkgs Library Functions</title>
-
- <para>
-  Nixpkgs provides a standard library at <varname>pkgs.lib</varname>, or through <code>import &lt;nixpkgs/lib&gt;</code>.
- </para>
-
- <!-- The index must have a root element to declare namespaces, but we
-      don't want to include it, so we select all of its children. -->
- <xi:include href="./library/generated/index.xml" xpointer="xpointer(/root/*)" />
-</section>

doc/hooks/index.md

···
+# Hooks reference {#chap-hooks}
+
+Nixpkgs has several hook packages that augment the stdenv phases.
+
+The stdenv built-in hooks are documented in [](#ssec-setup-hooks).
+
+```{=include=} sections
+autoconf.section.md
+automake.section.md
+autopatchelf.section.md
+breakpoint.section.md
+cmake.section.md
+gdk-pixbuf.section.md
+ghc.section.md
+gnome.section.md
+installShellFiles.section.md
+libiconv.section.md
+libxml2.section.md
+meson.section.md
+ninja.section.md
+patch-rc-path-hooks.section.md
+perl.section.md
+pkg-config.section.md
+postgresql-test-hook.section.md
+python.section.md
+qt-4.section.md
+scons.section.md
+tetex-tex-live.section.md
+unzip.section.md
+validatePkgConfig.section.md
+waf.section.md
+xcbuild.section.md
+```

doc/hooks/index.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-hooks">
- <title>Hooks reference</title>
- <para>
-  Nixpkgs has several hook packages that augment the stdenv phases.
- </para>
- <para>
-  The stdenv built-in hooks are documented in <xref linkend="ssec-setup-hooks"/>.
- </para>
- <xi:include href="./autoconf.section.xml" />
- <xi:include href="./automake.section.xml" />
- <xi:include href="./autopatchelf.section.xml" />
- <xi:include href="./breakpoint.section.xml" />
- <xi:include href="./cmake.section.xml" />
- <xi:include href="./gdk-pixbuf.section.xml" />
- <xi:include href="./ghc.section.xml" />
- <xi:include href="./gnome.section.xml" />
- <xi:include href="./installShellFiles.section.xml" />
- <xi:include href="./libiconv.section.xml" />
- <xi:include href="./libxml2.section.xml" />
- <xi:include href="./meson.section.xml" />
- <xi:include href="./ninja.section.xml" />
- <xi:include href="./patch-rc-path-hooks.section.xml" />
- <xi:include href="./perl.section.xml" />
- <xi:include href="./pkg-config.section.xml" />
- <xi:include href="./postgresql-test-hook.section.xml" />
- <xi:include href="./python.section.xml" />
- <xi:include href="./qt-4.section.xml" />
- <xi:include href="./scons.section.xml" />
- <xi:include href="./tetex-tex-live.section.xml" />
- <xi:include href="./unzip.section.xml" />
- <xi:include href="./validatePkgConfig.section.xml" />
- <xi:include href="./waf.section.xml" />
- <xi:include href="./xcbuild.section.xml" />
-</chapter>

doc/languages-frameworks/index.md

···
+# Languages and frameworks {#chap-language-support}
+
+The [standard build environment](#chap-stdenv) makes it easy to build typical Autotools-based packages with very little code. Any other kind of package can be accommodated by overriding the appropriate phases of `stdenv`. However, there are specialised functions in Nixpkgs to easily build packages for other programming languages, such as Perl or Haskell. These are described in this chapter.
+
+```{=include=} sections
+agda.section.md
+android.section.md
+beam.section.md
+bower.section.md
+chicken.section.md
+coq.section.md
+crystal.section.md
+cuda.section.md
+cuelang.section.md
+dart.section.md
+dhall.section.md
+dotnet.section.md
+emscripten.section.md
+gnome.section.md
+go.section.md
+haskell.section.md
+hy.section.md
+idris.section.md
+ios.section.md
+java.section.md
+javascript.section.md
+lisp.section.md
+lua.section.md
+maven.section.md
+nim.section.md
+ocaml.section.md
+octave.section.md
+perl.section.md
+php.section.md
+pkg-config.section.md
+python.section.md
+qt.section.md
+r.section.md
+ruby.section.md
+rust.section.md
+swift.section.md
+texlive.section.md
+titanium.section.md
+vim.section.md
+```

doc/languages-frameworks/index.xml

···
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-language-support">
- <title>Languages and frameworks</title>
- <para>
-  The <link linkend="chap-stdenv">standard build environment</link> makes it easy to build typical Autotools-based packages with very little code. Any other kind of package can be accommodated by overriding the appropriate phases of <literal>stdenv</literal>. However, there are specialised functions in Nixpkgs to easily build packages for other programming languages, such as Perl or Haskell. These are described in this chapter.
- </para>
- <xi:include href="agda.section.xml" />
- <xi:include href="android.section.xml" />
- <xi:include href="beam.section.xml" />
- <xi:include href="bower.section.xml" />
- <xi:include href="chicken.section.xml" />
- <xi:include href="coq.section.xml" />
- <xi:include href="crystal.section.xml" />
- <xi:include href="cuda.section.xml" />
- <xi:include href="cuelang.section.xml" />
- <xi:include href="dart.section.xml" />
- <xi:include href="dhall.section.xml" />
- <xi:include href="dotnet.section.xml" />
- <xi:include href="emscripten.section.xml" />
- <xi:include href="gnome.section.xml" />
- <xi:include href="go.section.xml" />
- <xi:include href="haskell.section.xml" />
- <xi:include href="hy.section.xml" />
- <xi:include href="idris.section.xml" />
- <xi:include href="ios.section.xml" />
- <xi:include href="java.section.xml" />
- <xi:include href="javascript.section.xml" />
- <xi:include href="lisp.section.xml" />
- <xi:include href="lua.section.xml" />
- <xi:include href="maven.section.xml" />
- <xi:include href="nim.section.xml" />
- <xi:include href="ocaml.section.xml" />
- <xi:include href="octave.section.xml" />
- <xi:include href="perl.section.xml" />
- <xi:include href="php.section.xml" />
- <xi:include href="pkg-config.section.xml" />
- <xi:include href="python.section.xml" />
- <xi:include href="qt.section.xml" />
- <xi:include href="r.section.xml" />
- <xi:include href="ruby.section.xml" />
- <xi:include href="rust.section.xml" />
- <xi:include href="swift.section.xml" />
- <xi:include href="texlive.section.xml" />
- <xi:include href="titanium.section.xml" />
- <xi:include href="vim.section.xml" />
-</chapter>

doc/lib.md

···
+# Nixpkgs `lib` {#id-1.4}
+
+```{=include=} chapters
+functions.md
+module-system/module-system.chapter.md
+```

doc/manual.md.in

···
+# Nixpkgs Manual {#nixpkgs-manual}
+## Version @MANUAL_VERSION@
+
+```{=include=} chapters
+preface.chapter.md
+```
+
+```{=include=} parts
+using-nixpkgs.md
+lib.md
+stdenv.md
+builders.md
+contributing.md
+```

doc/manual.xml

···
-<book xmlns="http://docbook.org/ns/docbook"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      xml:id="nixpkgs-manual">
- <info>
-  <title>Nixpkgs Manual</title>
-  <subtitle>Version <xi:include href=".version" parse="text" />
-  </subtitle>
- </info>
- <xi:include href="preface.chapter.xml" />
- <part xml:id="part-using">
-  <title>Using Nixpkgs</title>
-  <xi:include href="using/configuration.chapter.xml" />
-  <xi:include href="using/overlays.chapter.xml" />
-  <xi:include href="using/overrides.chapter.xml" />
- </part>
- <part>
-  <title>Nixpkgs <code>lib</code></title>
-  <xi:include href="functions.xml" />
-  <xi:include href="module-system/module-system.chapter.xml" />
- </part>
- <part xml:id="part-stdenv">
-  <title>Standard environment</title>
-  <xi:include href="stdenv/stdenv.chapter.xml" />
-  <xi:include href="stdenv/meta.chapter.xml" />
-  <xi:include href="stdenv/multiple-output.chapter.xml" />
-  <xi:include href="stdenv/cross-compilation.chapter.xml" />
-  <xi:include href="stdenv/platform-notes.chapter.xml" />
- </part>
- <part xml:id="part-builders">
-  <title>Builders</title>
-  <xi:include href="builders/fetchers.chapter.xml" />
-  <xi:include href="builders/trivial-builders.chapter.xml" />
-  <xi:include href="builders/testers.chapter.xml" />
-  <xi:include href="builders/special.xml" />
-  <xi:include href="builders/images.xml" />
-  <xi:include href="hooks/index.xml" />
-  <xi:include href="languages-frameworks/index.xml" />
-  <xi:include href="builders/packages/index.xml" />
- </part>
- <part xml:id="part-contributing">
-  <title>Contributing to Nixpkgs</title>
-  <xi:include href="contributing/quick-start.chapter.xml" />
-  <xi:include href="contributing/coding-conventions.chapter.xml" />
-  <xi:include href="contributing/submitting-changes.chapter.xml" />
-  <xi:include href="contributing/vulnerability-roundup.chapter.xml" />
-  <xi:include href="contributing/reviewing-contributions.chapter.xml" />
-  <xi:include href="contributing/contributing-to-documentation.chapter.xml" />
- </part>
-</book>

doc/stdenv.md

···
+# Standard environment {#part-stdenv}
+
+```{=include=} chapters
+stdenv/stdenv.chapter.md
+stdenv/meta.chapter.md
+stdenv/multiple-output.chapter.md
+stdenv/cross-compilation.chapter.md
+stdenv/platform-notes.chapter.md
+```

doc/stdenv/stdenv.chapter.md

···
 
 If the returned array contains exactly one object (e.g. `[{}]`), all values are optional and will be determined automatically.
 
-```{=docbook}
-<example>
-<title>Standard output of an update script using commit feature</title>
-```
+::: {.example #var-passthru-updateScript-example-commit}
+# Standard output of an update script using commit feature
 
 ```json
 [
···
   }
 ]
 ```
-
-```{=docbook}
-</example>
-```
+:::
 
 ### Recursive attributes in `mkDerivation` {#mkderivation-recursive-attributes}
 

doc/using-nixpkgs.md

···
+# Using Nixpkgs {#part-using}
+
+```{=include=} chapters
+using/configuration.chapter.md
+using/overlays.chapter.md
+using/overrides.chapter.md
+```

doc/using/configuration.chapter.md

···
 
 The following attributes can be passed in [`config`](#chap-packageconfig).
 
-```{=docbook}
-<include xmlns="http://www.w3.org/2001/XInclude" href="../doc-support/result/config-options.docbook.xml"/>
+```{=include=} options
+id-prefix: opt-
+list-id: configuration-variable-list
+source: ../doc-support/result/config-options.json/share/doc/nixos/options.json
 ```
 
 

pkgs/tools/nix/nixdoc/Cargo.lock

···
-[[package]]
-name = "ansi_term"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "arenatree"
-version = "0.1.1"
-source = "git+https://gitlab.com/jD91mZM2/arenatree#f9bf7efa9a5ef4c2dd9e2acc5a4cc79a987cb648"
-
-[[package]]
-name = "arrayvec"
-version = "0.4.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "atty"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "backtrace"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "backtrace-sys"
-version = "0.1.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "bitflags"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "cc"
-version = "1.0.25"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "cfg-if"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "clap"
-version = "2.32.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "failure"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "failure_derive"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libc"
-version = "0.2.43"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "nixdoc"
-version = "1.0.1"
-dependencies = [
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rnix 0.4.1 (git+https://gitlab.com/jD91mZM2/rnix.git?rev=10b86c94291b4864470158ef8750de85ddd8d4ba)",
- "structopt 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "nodrop"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "proc-macro2"
-version = "0.4.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "quote"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "redox_syscall"
-version = "0.1.40"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "redox_termios"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "rnix"
-version = "0.4.1"
-source = "git+https://gitlab.com/jD91mZM2/rnix.git?rev=10b86c94291b4864470158ef8750de85ddd8d4ba#10b86c94291b4864470158ef8750de85ddd8d4ba"
-dependencies = [
- "arenatree 0.1.1 (git+https://gitlab.com/jD91mZM2/arenatree)",
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smol_str 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "rustc-demangle"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "smol_str"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "strsim"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "structopt"
-version = "0.2.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "structopt-derive 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
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pkgs/tools/nix/nixdoc/default.nix

···
 
 rustPlatform.buildRustPackage rec {
   pname = "nixdoc";
-  version = "1.0.1";
+  version = "2.3.0";
 
   src = fetchFromGitHub {
-    owner = "tazjin";
+    owner = "nix-community";
     repo  = "nixdoc";
     rev = "v${version}";
-    sha256 = "14d4dq06jdqazxvv7fq5872zy0capxyb0fdkp8qg06gxl1iw201s";
+    sha256 = "sha256-8pp6xlmdb3kZ6unTiO4yRruyEZ//GIHZF1k8f4kQr9Q=";
   };
 
-  patches = [
-    # Support nested identifiers https://github.com/nix-community/nixdoc/pull/27
-    (fetchpatch {
-      url = "https://github.com/nix-community/nixdoc/pull/27/commits/ea542735bf675fe2ccd37edaffb9138d1a8c1b7e.patch";
-      sha256 = "1fmz44jv2r9qsnjxvkkjfb0safy69l4x4vx1g5gisrp8nwdn94rj";
-    })
-  ];
+  cargoSha256 = "sha256-k8/+BBMjQCsrgCi33fTdiSukaAZlg6XU3NwXaJdGYVw=";
 
   buildInputs =  lib.optionals stdenv.isDarwin [ darwin.Security ];
 
-  cargoLock = {
-    lockFile = ./Cargo.lock;
-    outputHashes = {
-      "arenatree-0.1.1" = "sha256-b3VVbYnWsjSjFMxvkfpJt13u+VC6baOIWD4qm1Gco4Q=";
-      "rnix-0.4.1" = "sha256-C1L/qXk6AimH7COrBlqpUA3giftaOYm/qNxs7rQgETA=";
-    };
-  };
-
   meta = with lib; {
     description = "Generate documentation for Nix functions";
-    homepage    = "https://github.com/tazjin/nixdoc";
+    homepage    = "https://github.com/nix-community/nixdoc";
     license     = [ licenses.gpl3 ];
-    maintainers = [ maintainers.tazjin ];
+    maintainers = [ maintainers.asymmetric ];
     platforms   = platforms.unix;
   };
 }