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#!/usr/bin/env bash
# vim: set sw=4 sts=4 et :

# Copyright (c) 2006, 2009, 2012 Ciaran McCreesh
# Copyright (c) 2015 David Leverton
#
# Based in part upon ebuild.sh from Portage, which is Copyright 1995-2005
# Gentoo Foundation and distributed under the terms of the GNU General
# Public License v2.
#
# This file is part of the Paludis package manager. Paludis is free software;
# you can redistribute it and/or modify it under the terms of the GNU General
# Public License, version 2, as published by the Free Software Foundation.
#
# Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307  USA

ebuild_load_module --older list_functions

useq()
{
    if [[ -n "${IUSE_EFFECTIVE:+x}" ]] ; then
        local i=( $IUSE_EFFECTIVE )
        if ! hasq ${1#!} "${i[@]#[+-]}" ; then
            die "Flag '${1#!}' is not included in IUSE_EFFECTIVE=\"${IUSE_EFFECTIVE}\""
        fi
    fi

    if [[ "${1:0:1}" == "!" ]] ; then
        ! hasq "${1#!}" "${USE}"
    else
        hasq "${1}" "${USE}"
    fi
}