nixpkgs/pkgs/build-support/setup-hooks/move-docs.sh

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# This setup hook automatically moves $out/{man,doc,info} to
# $out/share.
preFixupHooks+=(_moveDocs)
_moveDocs() {
forceShare=${forceShare:=man doc info}
if [ -z "$forceShare" ]; then return; fi
for d in $forceShare; do
if [ -d "$prefix/$d" ]; then
if [ -d "$prefix/share/$d" ]; then
echo "both $d/ and share/$d/ exist!"
else
echo "moving $prefix/$d to $prefix/share/$d"
mkdir -p $prefix/share
if [ -w $prefix/share ]; then
mv $prefix/$d $prefix/share
ln -s share/$d $prefix
fi
fi
fi
done
}