#! /bin/bash

# set -x

export tab='        '
export space=' '
export whitespace="${tab}${space}"
export pound='#'
export openparen='('
export backquote='`'

source '/etc/make.conf'

for use in ${USE} ; do
	export use
	echo "checking ${use}"
	if [[ "$(echo ${use} | sed 's/-//')" != "${use}" ]] ; then
		grep_opt=""
		use="$(echo ${use} | sed 's/-//')"
	else
		grep_opt="-v"
	fi
	echo $(
			set +x
			find '/usr/portage/' -name '*.ebuild' -print |
			xargs grep -H "^[^${pound}]*[${whitespace}${openparen}${backquote}]use[${whitespace}]-*${use}
^[^${pound}]*[${whitespace}${openparen}${backquote}]use_enable[${whitespace}]-*${use}
^[^${pound}]*[${whitespace}${openparen}${backquote}]use_with[${whitespace}]-*${use}" |
			grep -F $(echo "${use}" | sed 's/-//') |
			sed 's/-[0-9].*//g;s|/usr/portage/[^/]*/[^/]*/||g;s|^|/var/db/pkg/*/|;s|$|*/USE|' |
			uniq
		) |
	xargs grep -F -H -l ${grep_opt} ${use} 2>/dev/null |
	sed 's|/var/db/pkg/||;s|/USE||' |
	sort -u
done