#!/bin/bash

package_list=$(apt-cache policy "php-horde-*" | grep "^[a-z]" | cut -d: -f1)
seen_file=$(mktemp)
level=0

while [ -n "${package_list}" ]; do
    echo "### Dependency Level ${level} ###"
    remaining_packages=
    for pkg in ${package_list}; do
	depends=$(apt-cache rdepends "${pkg}" \
		      --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances \
		      | grep "^  php-horde-" | sort | uniq \
		      | grep -vwFf "${seen_file}")
	if [ -z "${depends}" ]; then
	    echo "${pkg}"
	    echo "${pkg}" >> "${seen_file}"
	else
	    remaining_packages="${remaining_packages} ${pkg}"
	fi

    done
    if [ "${package_list}" = "${remaining_packages}" ]; then
	echo
	echo "### Error - Could not untangle dependencies: ###"
	echo "${remaining_packages}"
	exit 1
    fi
    package_list="${remaining_packages}"
    level=$(( level + 1 ))
    echo
    echo
done