nixos/doc: convert "Contributing to this manual" to CommonMark

Also updates it to mention running md-to-db.sh.

+13
nixos/doc/manual/contributing-to-this-manual.chapter.md
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# Contributing to this manual {#chap-contributing}
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The DocBook and CommonMark sources of NixOS' manual are in the [nixos/doc/manual](https://github.com/NixOS/nixpkgs/tree/master/nixos/doc/manual) subdirectory of the [Nixpkgs](https://github.com/NixOS/nixpkgs) repository.
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You can quickly check your edits with the following:
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```ShellSession
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$ cd /path/to/nixpkgs
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$ ./nixos/doc/manual/md-to-db.sh
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$ nix-build nixos/release.nix -A manual.x86_64-linux
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```
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If the build succeeds, the manual will be in `./result/share/doc/nixos/index.html`.
-22
nixos/doc/manual/contributing-to-this-manual.xml
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="chap-contributing">
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<title>Contributing to this manual</title>
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<para>
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The DocBook sources of NixOS' manual are in the <filename
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xlink:href="https://github.com/NixOS/nixpkgs/tree/master/nixos/doc/manual">
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nixos/doc/manual</filename> subdirectory of the <link
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xlink:href="https://github.com/NixOS/nixpkgs">Nixpkgs</link> repository.
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</para>
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<para>
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You can quickly check your edits with the following:
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</para>
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<screen>
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<prompt>$ </prompt>cd /path/to/nixpkgs
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<prompt>$ </prompt>nix-build nixos/release.nix -A manual.x86_64-linux
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</screen>
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<para>
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If the build succeeds, the manual will be in
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<filename>./result/share/doc/nixos/index.html</filename>.
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</para>
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</chapter>
+22
nixos/doc/manual/from_md/contributing-to-this-manual.chapter.xml
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<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="chap-contributing">
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<title>Contributing to this manual</title>
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<para>
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The DocBook and CommonMark sources of NixOS’ manual are in the
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<link xlink:href="https://github.com/NixOS/nixpkgs/tree/master/nixos/doc/manual">nixos/doc/manual</link>
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subdirectory of the
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<link xlink:href="https://github.com/NixOS/nixpkgs">Nixpkgs</link>
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repository.
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</para>
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<para>
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You can quickly check your edits with the following:
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</para>
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<programlisting>
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$ cd /path/to/nixpkgs
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$ ./nixos/doc/manual/md-to-db.sh
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$ nix-build nixos/release.nix -A manual.x86_64-linux
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</programlisting>
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<para>
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If the build succeeds, the manual will be in
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<literal>./result/share/doc/nixos/index.html</literal>.
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</para>
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</chapter>
+1 -1
nixos/doc/manual/manual.xml
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<xi:include href="./generated/options-db.xml"
xpointer="configuration-variable-list" />
</appendix>
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<xi:include href="contributing-to-this-manual.xml" />
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<xi:include href="./from_md/contributing-to-this-manual.chapter.xml" />
<xi:include href="release-notes/release-notes.xml" />
</book>
+2 -1
nixos/doc/manual/md-to-db.sh
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mapfile -t MD_FILES < <(find . -type f -regex '.*\.md$')
for mf in ${MD_FILES[*]}; do
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mkdir -p $(dirname "$OUT/$mf")
if [ "${mf: -11}" == ".section.md" ]; then
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mkdir -p $(dirname "$OUT/$mf")
pandoc "$mf" -t docbook \
--extract-media=media \
-f markdown+smart \
···
fi
if [ "${mf: -11}" == ".chapter.md" ]; then
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mkdir -p $(dirname "$OUT/$mf")
pandoc "$mf" -t docbook \
--top-level-division=chapter \
--extract-media=media \