# Copyright 2013-2024 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.package import *


class Clapack(MakefilePackage):
    """CLAPACK is a f2c'ed version of LAPACK.

       The CLAPACK library was built using a Fortran to C conversion utility
    called f2c.  The entire Fortran 77 LAPACK library is run through f2c to
    obtain C code, and then modified to improve readability.  CLAPACK's goal
    is to provide LAPACK for someone who does not have access to a Fortran
    compiler."""

    homepage = "https://www.netlib.org/clapack/"
    url = "https://www.netlib.org/clapack/clapack.tgz"

    license("BSD-3-Clause")

    version("3.2.1", sha256="6dc4c382164beec8aaed8fd2acc36ad24232c406eda6db462bd4c41d5e455fac")

    variant("external-blas", default=True, description="Build with external BLAS (ATLAS here).")

    depends_on("atlas", when="+external-blas")

    def edit(self, spec, prefix):
        copy("make.inc.example", "make.inc")
        if "+external-blas" in spec:
            make_inc = FileFilter("make.inc")
            make_inc.filter(r"^BLASLIB.*", "BLASLIB = ../../libcblaswr.a -lcblas -latlas")
            makefile = FileFilter("Makefile")
            makefile.filter(r"^lib.*", "lib: variants lapacklib tmglib")

    def build(self, spec, prefix):
        make("f2clib")
        make("cblaswrap" if "+external-blas" in spec else "blaslib")
        make("lib")

    def install(self, spec, prefix):
        install_tree(".", prefix)