bash space safe cleanup hooks

libhook.sh

__cleanup_hook_i=0

__cleanup_hook () {
    for ((i=__cleanup_hook_i - 1; i >= 0; i--)); do
        eval "\"\${__cleanup_hook_action_${i}[@]}\""
    done
}

trap __cleanup_hook EXIT

register_cleanup () {
    eval "__cleanup_hook_action_$((__cleanup_hook_i++))=( \"\$@\" )"
}