##############################################################################
# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program 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 terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser 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
##############################################################################
from spack import *


class Expat(AutotoolsPackage):
    """Expat is an XML parser library written in C."""

    homepage = "http://expat.sourceforge.net/"
    url      = "https://sourceforge.net/projects/expat/files/expat/2.2.2/expat-2.2.2.tar.bz2"

    # Version 2.2.2 introduced a requirement for a high quality
    # entropy source.  "Older" linux systems (aka CentOS 7) do not
    # support get_random so we'll provide a high quality source via
    # libbsd.
    # There's no need for it in earlier versions, so 'conflict' if
    # someone's asking for an older version and also libbsd.
    # In order to install an older version, you'll need to add
    # `~libbsd`.
    variant('libbsd', default=True,
            description="Use libbsd (for high quality randomness)")
    depends_on('libbsd', when="@2.2.1:+libbsd")

    version('2.2.2', '1ede9a41223c78528b8c5d23e69a2667')
    version('2.2.0', '2f47841c829facb346eb6e3fab5212e2')

    def configure_args(self):
        spec = self.spec
        args = []
        if '+libbsd' in spec and '@2.2.1:' in spec:
            args = ['--with-libbsd']
        return args