#!/bin/sh
#
# Copyright (c) 2011  Peter Pentchev
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

set -e

usage()
{
	cat <<EOUSAGE
Usage:	recremove [-v] pkgname...
	recremove [-hV]

	-h	display program usage information and exit
	-V	display program version information and exit
	-v	verbose operation; display diagnostic output
EOUSAGE
}

version()
{
	echo 'recremove 0.01'
}

unset opt_h opt_V
vecho='true'

while getopts 'hVv' o; do
	case "$o" in
		h)
			opt_h=1
			;;

		V)
			opt_V=1
			;;

		v)
			vecho='echo'
			;;

		*)
			usage 1>&2
			exit 1
			;;
	esac
done
[ -z "$opt_V" ] || version
[ -z "$opt_h" ] || usage
[ -z "$opt_h$opt_V" ] || exit 0

if [ "$#" = 0 ]; then
	echo 'Usage: recremove pkgname...' 1>&2
	exit 1
fi

list="$@"
while true; do
	$vecho "Trying for $list"
	newlist=`LANG=C dpkg -r --dry-run $list 2>&1 | awk '/ depends on / {print $1}' | LANG=C sort -u | xargs -r`
	if [ -z "$newlist" ] || [ "$list" = "$newlist" ]; then
		$vecho "No more!"
		break
	fi
	$vecho "Got $newlist"
	list=`echo "$list $newlist" | xargs -rn1 | LANG=C sort -u | xargs -r`
	$vecho "List is now $list"
done

echo "$list"