#!/bin/bash

declare -a atoms
if [[ x$1 == x ]] ; then
	atoms=( '@world' )
else
	atoms=( "$@" )
fi

emerge_result=$( emerge --ignore-default-opts -epqD --backtrack=999 --with-bdeps=y "${atoms[@]}" 2>/dev/null ) 

trouble=$?

echo "${emerge_result}" |grep -v ^.uninstall | grep -v ^.blocks | sed 's/^.[^]]*] /=/;s/ \[[^]]*].*$//'

if [[ ${trouble} != 0 ]] ; then
	echo "WARNING: results not reliable due to portage failure." >&2
	echo "since portage stderr is ignored by this script, this" >&2
	echo "could mean anything, perhaps depsolving trouble?" >&2
	exit ${trouble}
fi

exit 0