Unpack .unitypackage files

unpack-unitypackage.sh

#!/bin/sh
set -e

if [ -z "$1" ]; then
	echo "Usage: $0 FILE.unitypackage" >&2
	exit 1
fi

tmp=$(mktemp -d)
tar -C "$tmp" -x -f "$1"

out=$(basename -s .unitypackage "$1")
mkdir "$out"

for a in "$tmp"/*; do
	[ -e "$a/pathname" -a -e "$a/asset" ] || continue
	p=$(cat "$a/pathname")
	mkdir -p "$out/$(dirname "$p")"
	mv "$a/asset" "$out/$p"
done

rm -r "$tmp"