# $Id$

PNAME="rust"
PVER="1.28.0"
PBUILD="r1"

PCAT="dev-lang"

DESCRIPTION="Systems programming language focused on safety, speed and concurrency."
HOMEPAGE="https://www.rust-lang.org/"

# enable bootstrap of rust with prebuild binary rust
# 0=no, 1=yes
BOOTSTRAP=1

DEPEND=">= sys-libs/llvm-libs-6.0"

SDEPEND=">= sys-dev/llvm-6.0
	>= dev-lang/perl-5.26
	>= dev-lang/python-2.7
	>= dev-libs/libffi-3.2
	>= dev-libs/jemalloc-5.1
	>= net-misc/curl-7
	>= dev-util/cmake-3.12
	>= net-misc/curl-dev-7
	>= app-arch/xz-utils-5
	>= dev-libs/libffi-dev-3.2
	>= dev-libs/jemalloc-dev-5.1"

if [[ ${BOOTSTRAP} = 0 ]]
then
	SDEPEND+="
		>= dev-lang/rust-1.27"
fi

SRCFILE="${PNAME}c-${PVER}-src.tar.gz"
SRCDIR="${BUILDDIR}/${PNAME}c-${PVER}-src"

msetfeature "!check"
sminclude mbuild mtools

SRC_URI=(
	https://static.rust-lang.org/dist/${SRCFILE}
	mirror://${PNAME}/${SRCFILE}
)

UP2DATE="updatecmd https://www.rust-lang.org/en-US/other-installers.html | grep 'rustc-.*-src.*' | sed 's:-src::g' | highesttarball gz"

if [[ ${BOOTSTRAP} = 1 ]]
then
	# see src/stage0.txt
	RUSTBIN_PVER="1.27.2"
	RUSTBIN_DATE="2018-07-20"
	RUSTBIN_SRCFILE_x86_64="rustc-${RUSTBIN_PVER}-x86_64-unknown-linux-gnu.tar.gz"
	RUSTBIN_SRCFILE_x86="rustc-${RUSTBIN_PVER}-i686-unknown-linux-gnu.tar.gz"
	RUSTBIN_SRCFILE="$(marchsrcfile RUSTBIN_SRCFILE)"
	RUSTSTD_SRCFILE_x86_64="rust-std-${RUSTBIN_PVER}-x86_64-unknown-linux-gnu.tar.gz"
	RUSTSTD_SRCFILE_x86="rust-std-${RUSTBIN_PVER}-i686-unknown-linux-gnu.tar.gz"
	RUSTSTD_SRCFILE="$(marchsrcfile RUSTSTD_SRCFILE)"
	CARGOBIN_PVER="0.28.0"
	CARGOBIN_SRCFILE_x86_64="cargo-${CARGOBIN_PVER}-x86_64-unknown-linux-gnu.tar.gz"
	CARGOBIN_SRCFILE_x86="cargo-${CARGOBIN_PVER}-i686-unknown-linux-gnu.tar.gz"
	CARGOBIN_SRCFILE="$(marchsrcfile CARGOBIN_SRCFILE)"

	SRC_URI+=(
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${RUSTBIN_SRCFILE_x86_64}
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${RUSTBIN_SRCFILE_x86}
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${RUSTSTD_SRCFILE_x86_64}
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${RUSTSTD_SRCFILE_x86}
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${CARGOBIN_SRCFILE_x86_64}
		https://static.rust-lang.org/dist/${RUSTBIN_DATE}/${CARGOBIN_SRCFILE_x86}
	)
fi

src_prepare()
{
	munpack ${SRCFILE} || die

	if [[ ${BOOTSTRAP} = 1 ]]
	then
		install -d ${SRCDIR}/build/cache/${RUSTBIN_DATE} || die
		ln -snf ${SOURCEDIR}/${PNAME}/${RUSTBIN_SRCFILE} ${SRCDIR}/build/cache/${RUSTBIN_DATE}/ || die
		ln -snf ${SOURCEDIR}/${PNAME}/${RUSTSTD_SRCFILE} ${SRCDIR}/build/cache/${RUSTBIN_DATE}/ || die
		ln -snf ${SOURCEDIR}/${PNAME}/${CARGOBIN_SRCFILE} ${SRCDIR}/build/cache/${RUSTBIN_DATE}/ || die
	fi
}

src_compile()
{
	cd ${SRCDIR}

	local myconf

	# enforce rust-bin chost
	local myARCH="${ARCH}"
	[[ ${ARCH} = i*86 ]] && myARCH=i686
	myconf+=" --host=${myARCH}-unknown-linux-gnu --build=${myARCH}-unknown-linux-gnu"

	if [[ ${BOOTSTRAP} = 0 ]]
	then
		myconf+=" --enable-local-rust"
	fi

	# configure nor working after rewrite, duplicate options are not accepted anymore
	# not working atm due bug:
	# --infodir=/usr/share/info
	# --localstatedir=/var/lib
	# --datadir=/usr/share
	./configure \
		--prefix=/usr \
		--mandir=/usr/share/man \
		--sysconfdir=/etc \
		--libdir=/usr/$(mlibdir) \
		--release-channel=stable \
		--llvm-root=/usr \
		--enable-llvm-link-shared \
		--jemalloc-root=/usr/$(mlibdir) \
		--disable-codegen-tests \
		${myconf} \
		|| die

	# missing llvm link deps
	export RUSTFLAGS="$RUSTFLAGS -C link-args=-lffi"
	python2 ./x.py build --verbose || die
}

src_install()
{
	cd ${SRCDIR}
	mmake DESTDIR=${BINDIR} install || die

	# remove unnecessary files
	mdelete /usr/$(mlibdir)/rustlib/components || die
	mdelete /usr/$(mlibdir)/rustlib/manifest-rustc || die
	mdelete /usr/$(mlibdir)/rustlib/rust-installer-version || die

	# overwrite duplicate solibs with symlinks to safe space
	local myARCH="${ARCH}"
	[[ ${ARCH} = i*86 ]] && myARCH=i686
	local i
	for i in ${BINDIR}/usr/$(mlibdir)/rustlib/${myARCH}-unknown-linux-gnu/lib/*
	do
		mlink rustlib/${myARCH}-unknown-linux-gnu/lib/$(basename ${i}) /usr/$(mlibdir)/ || die
	done

	minstalldocs COPYRIGHT LICENSE-* ChangeLog README* || die
}