#!/bin/bash

CLEANUP=
CLEANUP_INDEX=1
CLEANUP_LEVEL=0

push_cleanup()
{
	CLEANUP="$1 $CLEANUP"
	shift

	local i=1
	local arg
	for arg
	do
		eval CLEANUP_${CLEANUP_INDEX}_ARG$i=\"\$arg\"
		i=$((i+1))
	done
	eval CLEANUP_${CLEANUP_INDEX}_ARGNUM=$(($i-1))
	CLEANUP_INDEX=$((CLEANUP_INDEX+1))
}

pop_cleanup()
{
	cleanup=$(echo "$CLEANUP" | $SED -e "s/^\([^[:space:]]*\).*/\1/")
	CLEANUP=$(echo "$CLEANUP" | $SED -e "s/^[^[:space:]]*[[:space:]]*\(.*\)/\1/")
	CLEANUP_INDEX=$((CLEANUP_INDEX-1))

	if [ -n "$1" ]
	then
		local args=
		eval local argnum=\$CLEANUP_${CLEANUP_INDEX}_ARGNUM
		local i
		for i in $(seq 1 $argnum)
		do
			eval local arg=\$CLEANUP_${CLEANUP_INDEX}_ARG$i
			args+="\"$arg\" "
		done

		CLEANUP_LEVEL=$((CLEANUP_LEVEL+1))
		eval $cleanup $args
		CLEANUP_LEVEL=$((CLEANUP_LEVEL-1))
	fi
}

run_cleanups()
{
	while [ -n "$CLEANUP" ]
	do
		pop_cleanup 1
	done
}

trap run_cleanups EXIT