# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI=6

RESTRICT="test"

inherit llvm pax-utils toolchain-funcs

DESCRIPTION="High-performance programming language for technical computing"
HOMEPAGE="https://julialang.org/"
SRC_URI="
	https://github.com/JuliaLang/${PN}/releases/download/v${PV}/${P}.tar.gz
	https://dev.gentoo.org/~tamiko/distfiles/${P}-bundled.tar.gz
"

S="${WORKDIR}/julia"

LICENSE="MIT"
SLOT="0"
KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
IUSE=""

RDEPEND="
	>=sys-devel/llvm-4.0.0:=
	>=sys-devel/clang-4.0.0:="
LLVM_MAX_SLOT=5

RDEPEND+="
	dev-libs/double-conversion:0=
	dev-libs/gmp:0=
	dev-libs/libgit2:0=
	>=dev-libs/libpcre2-10.23:0=[jit]
	dev-libs/mpfr:0=
	dev-libs/openspecfun
	sci-libs/amd:0=
	sci-libs/arpack:0=
	sci-libs/camd:0=
	sci-libs/ccolamd:0=
	sci-libs/cholmod:0=
	sci-libs/colamd:0=
	sci-libs/fftw:3.0=[threads]
	sci-libs/openlibm:0=
	sci-libs/spqr:0=
	sci-libs/umfpack:0=
	sci-mathematics/glpk:0=
	>=sys-libs/libunwind-1.1:7=
	sys-libs/readline:0=
	sys-libs/zlib:0=
	>=virtual/blas-3.6
	virtual/lapack"

DEPEND="${RDEPEND}
	dev-vcs/git
	dev-util/patchelf
	virtual/pkgconfig"

PATCHES=(
	"${FILESDIR}"/${PN}-1.0.0-fix_build_system.patch
)

src_prepare() {
	mv "${WORKDIR}"/bundled/UnicodeData.txt doc || die
	mkdir deps/srccache || die
	mv "${WORKDIR}"/bundled/* deps/srccache || die
	rmdir "${WORKDIR}"/bundled || die

	default

	# Sledgehammer:
	# - prevent fetching of bundled stuff in compile and install phase
	# - respect CFLAGS
	# - respect EPREFIX and Gentoo specific paths
	# - fix BLAS and LAPACK link interface

	sed -i \
		-e 's|git submodule|${EPREFIX}/bin/true|g' \
		-e "s|GENTOOCFLAGS|${CFLAGS}|g" \
		-e "s|/usr/include|${EPREFIX%/}/usr/include|g" \
		deps/Makefile || die

	local libblas="$($(tc-getPKG_CONFIG) --libs-only-l blas)"
	libblas="${libblas%% *}"
	libblas="lib${libblas#-l}"
	local liblapack="$($(tc-getPKG_CONFIG) --libs-only-l lapack)"
	liblapack="${liblapack%% *}"
	liblapack="lib${liblapack#-l}"

	sed -i \
		-e "s|GENTOOCFLAGS|${CFLAGS}|g" \
		-e "s|GENTOOLIBDIR|$(get_libdir)|" \
		-e "s|^JULIA_COMMIT = .*|JULIA_COMMIT = v${PV}|" \
		-e "s|-lblas|$($(tc-getPKG_CONFIG) --libs blas)|" \
		-e "s|= libblas|= ${libblas}|" \
		-e "s|-llapack|$($(tc-getPKG_CONFIG) --libs lapack)|" \
		-e "s|= liblapack|= ${liblapack}|" \
		Make.inc || die

	sed -i \
		-e "s|,lib)|,$(get_libdir))|g" \
		-e "s|\$(BUILD)/lib|\$(BUILD)/$(get_libdir)|g" \
		Makefile || die

	sed -i \
		-e "s|ar -rcs|$(tc-getAR) -rcs|g" \
		src/Makefile || die

	# disable doc install starting  git fetching
	sed -i -e 's~install: $(build_depsbindir)/stringreplace $(BUILDROOT)/doc/_build/html/en/index.html~install: $(build_depsbindir)/stringreplace~' Makefile || die
}

src_configure() {
	# julia does not play well with the system versions of dsfmt, libuv,
	# and utf8proc

	# USE_SYSTEM_LIBM=0 implies using external openlibm
	cat <<-EOF > Make.user
		USE_SYSTEM_DSFMT=0
		USE_SYSTEM_LIBUV=0
		USE_SYSTEM_PCRE=1
		USE_SYSTEM_RMATH=0
		USE_SYSTEM_UTF8PROC=0
		USE_LLVM_SHLIB=0
		USE_SYSTEM_ARPACK=1
		USE_SYSTEM_BLAS=1
		USE_SYSTEM_FFTW=1
		USE_SYSTEM_GMP=1
		USE_SYSTEM_GRISU=1
		USE_SYSTEM_LAPACK=1
		USE_SYSTEM_LIBGIT2=1
		USE_SYSTEM_LIBM=0
		USE_SYSTEM_LIBUNWIND=1
		USE_SYSTEM_LLVM=1
		USE_SYSTEM_MPFR=1
		USE_SYSTEM_OPENLIBM=1
		USE_SYSTEM_OPENSPECFUN=1
		USE_SYSTEM_PATCHELF=1
		USE_SYSTEM_READLINE=1
		USE_SYSTEM_SUITESPARSE=1
		USE_SYSTEM_ZLIB=1
		VERBOSE=1
		libdir="${EROOT}/usr/$(get_libdir)"
	EOF

}

src_compile() {

	# Julia accesses /proc/self/mem on Linux
	addpredict /proc/self/mem

	emake cleanall

	# Create symlinks...
	local libblas="$($(tc-getPKG_CONFIG) --libs-only-l blas)"
	libblas="${libblas%% *}"
	libblas="lib${libblas#-l}"
	local liblapack="$($(tc-getPKG_CONFIG) --libs-only-l lapack)"
	liblapack="${liblapack%% *}"
	liblapack="lib${liblapack#-l}"
	mkdir -p "${S}"/usr/lib/julia || die "mkdir failed"
	for i in ${libblas}.so ${liblapack}.so libumfpack.so libspqr.so; do
		ln -s "${EROOT}/usr/$(get_libdir)/${i}" "${S}"/usr/lib/julia/ || die "ln failed"
	done

	emake VERBOSE=1 julia-release \
		prefix="${EPREFIX}/usr" DESTDIR="${D}" \
		CC="$(tc-getCC)" CXX="$(tc-getCXX)"
	pax-mark m $(file usr/bin/julia-* | awk -F : '/ELF/ {print $1}')
	emake
}

src_test() {
	emake test
}

src_install() {
	# Julia is special. It tries to find a valid git repository (that would
	# normally be cloned during compilation/installation). Just make it
	# happy...
	git init && \
		git config --local user.email "whatyoudoing@example.com" && \
		git config --local user.name "Whyyyyyy" && \
		git commit -a --allow-empty -m "initial" || die "git failed"

	emake install \
		prefix="${EPREFIX}/usr" DESTDIR="${D}" \
		CC="$(tc-getCC)" CXX="$(tc-getCXX)"
	cat > 99julia <<-EOF
		LDPATH=${EROOT%/}/usr/$(get_libdir)/julia
	EOF
	doenvd 99julia

	dodoc README.md

	mv "${ED}"/usr/etc/julia "${ED}"/etc || die
	rmdir "${ED}"/usr/etc || die
	mv "${ED}"/usr/share/doc/julia/{examples,html} \
		"${ED}"/usr/share/doc/${PF} || die
	rmdir "${ED}"/usr/share/doc/julia || die
}