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##############################################################################
# Copyright (c) 2013-2017, 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/spack/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 Ruby(Package):
    """A dynamic, open source programming language with a focus on
    simplicity and productivity."""

    homepage = "https://www.ruby-lang.org/"
    url      = "http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0.tar.gz"

    extendable = True

    version('2.2.0', 'cd03b28fd0b555970f5c4fd481700852')
    depends_on('libffi')
    depends_on('zlib')
    variant('openssl', default=False, description="Enable OpenSSL support")
    depends_on('openssl', when='+openssl')
    variant('readline', default=False, description="Enable Readline support")
    depends_on('readline', when='+readline')

    def install(self, spec, prefix):
        options = ["--prefix=%s" % prefix]
        if '+openssl' in spec:
            options.append("--with-openssl-dir=%s" % spec['openssl'].prefix)
        if '+readline' in spec:
            options.append("--with-readline-dir=%s" % spec['readline'].prefix)
        configure(*options)
        make()
        make("install")

    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
        # TODO: do this only for actual extensions.
        # Set GEM_PATH to include dependent gem directories
        ruby_paths = []
        for d in dependent_spec.traverse():
            if d.package.extends(self.spec):
                ruby_paths.append(d.prefix)

        spack_env.set_path('GEM_PATH', ruby_paths)

        # The actual installation path for this gem
        spack_env.set('GEM_HOME', dependent_spec.prefix)

    def setup_dependent_package(self, module, dependent_spec):
        """Called before ruby modules' install() methods.  Sets GEM_HOME
        and GEM_PATH to values appropriate for the package being built.

        In most cases, extensions will only need to have one line::

            gem('install', '<gem-name>.gem')
        """
        # Ruby extension builds have global ruby and gem functions
        module.ruby = Executable(join_path(self.spec.prefix.bin, 'ruby'))
        module.gem = Executable(join_path(self.spec.prefix.bin, 'gem'))