from spack import *
import os

class Julia(Package):
    """The Julia Language: A fresh approach to technical computing"""
    homepage = "http://julialang.org"
    url      = "https://github.com/JuliaLang/julia/releases/download/v0.4.3/julia-0.4.3-full.tar.gz"

    version('master',
            git='https://github.com/JuliaLang/julia.git', branch='master')
    version('0.4.5', '69141ff5aa6cee7c0ec8c85a34aa49a6')
    version('0.4.3', '8a4a59fd335b05090dd1ebefbbe5aaac')

    patch('gc.patch')
    patch('openblas.patch', when='@0.4:0.4.5')

    # Build-time dependencies:
    # depends_on("awk")
    # depends_on("m4")
    # depends_on("pkg-config")

    # Combined build-time and run-time dependencies:
    depends_on("binutils")
    depends_on("cmake @2.8:")
    depends_on("git")
    depends_on("openssl")
    depends_on("python @2.7:2.999")

    # I think that Julia requires the dependencies above, but it
    # builds fine (on my system) without these. We should enable them
    # as necessary.

    # Run-time dependencies:
    # depends_on("arpack")
    # depends_on("fftw +float")
    # depends_on("gmp")
    # depends_on("libgit")
    # depends_on("mpfr")
    # depends_on("openblas")
    # depends_on("pcre2")

    # ARPACK: Requires BLAS and LAPACK; needs to use the same version
    # as Julia.

    # BLAS and LAPACK: Julia prefers 64-bit versions on 64-bit
    # systems. OpenBLAS has an option for this; make it available as
    # variant.

    # FFTW: Something doesn't work when using a pre-installed FFTW
    # library; need to investigate.

    # GMP, MPFR: Something doesn't work when using a pre-installed
    # FFTW library; need to investigate.

    # LLVM: Julia works only with specific versions, and might require
    # patches. Thus we let Julia install its own LLVM.

    # Other possible dependencies:
    # USE_SYSTEM_OPENLIBM=0
    # USE_SYSTEM_OPENSPECFUN=0
    # USE_SYSTEM_DSFMT=0
    # USE_SYSTEM_SUITESPARSE=0
    # USE_SYSTEM_UTF8PROC=0
    # USE_SYSTEM_LIBGIT2=0

    # Run-time dependencies for Julia packages:
    depends_on("hdf5")
    depends_on("mpi")

    def install(self, spec, prefix):
        if '@master' in spec:
            # Julia needs to know the offset from a specific commit
            git = which('git')
            git('fetch', '--unshallow')

        # Explicitly setting CC, CXX, or FC breaks building libuv, one
        # of Julia's dependencies. This might be a Darwin-specific
        # problem. Given how Spack sets up compilers, Julia should
        # still use Spack's compilers, even if we don't specify them
        # explicitly.
        options = [#"CC=cc",
                   #"CXX=c++",
                   #"FC=fc",
                   #"USE_SYSTEM_ARPACK=1",
                   #"USE_SYSTEM_FFTW=1",
                   #"USE_SYSTEM_GMP=1",
                   #"USE_SYSTEM_MPFR=1",
                   #TODO "USE_SYSTEM_PCRE=1",
                   "prefix=%s" % prefix]
        with open('Make.user', 'w') as f:
            f.write('\n'.join(options) + '\n')
        make()
        make("install")