nixos/doc/md-to-db.sh: handle Docbook inclues in CommonMark

You can do includes like this:

```{=docbook}
<xi:include href="rl-2111.section.xml" />
```

Changed files
+7 -3
nixos
doc
manual
+1 -1
nixos/doc/manual/from_md/development/writing-documentation.chapter.xml
···
-
<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-writing-documentation">
+
<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="sec-writing-documentation">
<title>Writing NixOS Documentation</title>
<para>
As NixOS grows, so too does the need for a catalogue and explanation
+6 -2
nixos/doc/manual/md-to-db.sh
···
for mf in ${MD_FILES[*]}; do
if [ "${mf: -11}" == ".section.md" ]; then
mkdir -p $(dirname "$OUT/$mf")
+
OUTFILE="$OUT/${mf%".section.md"}.section.xml"
pandoc "$mf" "${pandoc_flags[@]}" \
-
-o "$OUT/${mf%".section.md"}.section.xml"
+
-o "$OUTFILE"
+
grep -q -m 1 "xi:include" "$OUTFILE" && sed -i 's|xmlns:xlink="http://www.w3.org/1999/xlink"| xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude"|' "$OUTFILE"
fi
if [ "${mf: -11}" == ".chapter.md" ]; then
mkdir -p $(dirname "$OUT/$mf")
+
OUTFILE="$OUT/${mf%".chapter.md"}.chapter.xml"
pandoc "$mf" "${pandoc_flags[@]}" \
--top-level-division=chapter \
-
-o "$OUT/${mf%".chapter.md"}.chapter.xml"
+
-o "$OUTFILE"
+
grep -q -m 1 "xi:include" "$OUTFILE" && sed -i 's|xmlns:xlink="http://www.w3.org/1999/xlink"| xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude"|' "$OUTFILE"
fi
done