#!/bin/bash
# count_zero 2006
# distributed under the GPLv2
# Bash Script to unmerge all packages that contain a given keyword

mkdir -p /tmp/massunmerge
packages=/tmp/massunmerge/packages
keyword=$1
list=/tmp/massunmerge/list
list2=/tmp/massunmerge/list2
rm -f $packages $list $list2
if [[ $1 = "" ]]
	then echo "Please input the keyword to be mass unmerged:" 
   	read keyword
	else :
fi

if [[ $keyword = "" ]]
	then
        echo "You need to enter a keyword next time"
        exit
	else :
fi

ls -R /var/db/pkg/ | grep $keyword | sed 's/\/var\/db\/pkg\///g' | sed 's/://g' | sed 's/-r[0-9]$//g' | sed 's/\.//g' | sed 's/-[0-9]*$//g' | grep \/ | xargs emerge -pC | sed '/^>/d' > $packages
list=$packages
input=1
until [[ -z $input ]]
	do
	cat $list | sed '/./,/^$/!d' | sed 's/[0-9]*)\ //' > $list
	number=1
	cat $list | while read each
		do
		if [ -z `echo $each | grep /` ]
			then echo $each >> $list2
			else echo $each | sed "s/.*/$number) &/" >> $list2
			number=$(( number + 1 ))
		fi
		done
	cat $list2
	echo -n "Enter the numbers of the packages, separated by a comma, 
that you want to remove from this list. Else, hit enter to continue: "
	read input
	input=`echo $input | sed 's/\,/ /g' | sed 's/\ \ / /g' | sed 's/^\ //'`
	for each in `echo $input`
		do
		cat $list2 | sed "/^$each)/,/^$/ s/.*//" > $list
		cat $list > $list2
		done
	rm -rf $list2
	done

cat $list | grep / > $packages

echo -n "These are the packages that I will unmerge. Are you sure you want
to go through with this? [y/n]: "

read var

if [ $var = "y" ]
	then
	cat $packages | xargs emerge -C
	else 
        echo "Sorry to hear that, maybe you should revise your keyword"
        exit
fi
echo Done!