# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

from spack import *


class Ldc(CMakePackage):
    """The LDC project aims to provide a portable D programming language
    compiler with modern optimization and code generation capabilities.

    LDC is fully Open Source; the parts of the code not taken/adapted from
    other projects are BSD-licensed (see the LICENSE file for details).

    Consult the D wiki for further information: http://wiki.dlang.org/LDC
    """

    homepage = "https://dlang.org/"
    url      = "https://github.com/ldc-developers/ldc/releases/download/v1.3.0/ldc-1.3.0-src.tar.gz"

    version('1.3.0', sha256='efe31a639bcb44e1f5b752da21713376d9410a01279fecc8aab8572065a3050b')

    variant(
        'shared',
        default=True,
        description='Build runtime and tooling as shared libs'
    )

    depends_on('llvm@3.9:')
    depends_on('zlib')
    depends_on('libconfig')
    depends_on('curl')
    depends_on('libedit')
    depends_on('binutils', type=('build', 'link', 'run'))
    depends_on('ldc-bootstrap', type=('build', 'link'))

    provides('D@2')

    def cmake_args(self):
        ldmd2 = self.spec['ldc-bootstrap'].prefix.bin.ldmd2

        args = [
            '-DD_COMPILER:STRING={0}'.format(ldmd2),
            '-DBUILD_SHARED_LIBS:BOOL={0}'.format(
                'ON' if '+shared' in self.spec else 'OFF'
            ),
            '-DLDC_INSTALL_LTOPLUGIN:BOOL=ON',
            '-DLDC_BUILD_WITH_LTO:BOOL=OFF'
        ]

        return args

    @run_after('install')
    def add_rpath_to_conf(self):

        # Here we modify the configuration file for ldc2 to inject flags
        # that will rpath the standard library location

        config_file = join_path(self.prefix.etc, 'ldc2.conf')

        search_for = r'switches = \['
        substitute_with = 'switches = [\n' + \
                          '        "-L-rpath={0}",'.format(self.prefix.lib)

        filter_file(search_for, substitute_with, config_file)
