nixpkgs/pkgs/build-support/setup-hooks/compress-man-pages.sh

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fixupOutputHooks+=('if [ -z "${dontGzipMan-}" ]; then compressManPages "$prefix"; fi')
compressManPages() {
local dir="$1"
if [ -L "$dir"/share ] || [ -L "$dir"/share/man ] || [ ! -d "$dir/share/man" ]
then return
fi
echo "gzipping man pages under $dir/share/man/"
# Compress all uncompressed manpages. Don't follow symlinks, etc.
find "$dir"/share/man/ -type f -a '!' -regex '.*\.\(bz2\|gz\)$' -print0 \
| while IFS= read -r -d $'\0' f
do
if gzip -c -n "$f" > "$f".gz; then
rm "$f"
else
rm "$f".gz
fi
done
# Point symlinks to compressed manpages.
find "$dir"/share/man/ -type l -a '!' -regex '.*\.\(bz2\|gz\)$' -print0 \
| sort -z \
| while IFS= read -r -d $'\0' f
do
local target
target="$(readlink -f "$f")"
if [ -f "$target".gz ]; then
ln -sf "$target".gz "$f".gz && rm "$f"
fi
done
}