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

# Copyright (c) 2006 Ciaran McCreesh <ciaranm@ciaranm.org>
#
# 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

use()
{
    useq "${1}"
}

usev()
{
    if useq "${1}" ; then
        echo "${1#!}"
        return 0
    else
        return 1
    fi
}

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

has()
{
    hasq "${@}"
}

hasv()
{
    if hasq "${@}" ; then
        echo "${1}"
        return 0
    else
        return 1
    fi
}

hasq()
{
    local x= want="$1"
    shift
    for x in $@ ; do
        [[ "${x}" == "${want}" ]] && return 0
    done
    return 1
}