# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

DESCRIPTION="Suite for first-principles electronic-structure calculations and materials modeling"
HOMEPAGE="https://www.quantum-espresso.org/"

CMAKE_MAKEFILE_GENERATOR=emake

inherit cmake

SRC_URI="https://gitlab.com/QEF/q-e/-/archive/qe-${PV}/q-e-qe-${PV}.tar.gz -> ${P}.tar.gz"
S="${WORKDIR}/q-e-qe-${PV}"
KEYWORDS="~amd64"

LICENSE="GPL-2"
SLOT="0"
IUSE="+system-blas +system-fftw +system-lapack +libxc hdf5 openmp mpi elpa scalapack"

RESTRICT="network-sandbox"

PATCHES=(
	${FILESDIR}/02-fix-gui-install.patch
)
#	${FILESDIR}/03-wannier90-4-linking.patch
# for companion 03-* patch see src_prepare below

RDEPEND="
	system-blas? ( virtual/blas )
	system-lapack? ( virtual/lapack )
	system-fftw? ( sci-libs/fftw[fortran] )
	mpi? ( virtual/mpi[fortran,threads] system-fftw? ( sci-libs/fftw[mpi] ) sci-libs/wannier90:=[mpi] )
	scalapack? ( sci-libs/scalapack )
	hdf5? ( sci-libs/hdf5[fortran] )
	openmp? ( sys-devel/gcc[openmp] system-fftw? ( sci-libs/fftw[openmp] ) )
	libxc? ( >=sci-libs/libxc-5.1.2[fortran] )
	elpa? ( sci-libs/elpa openmp? ( sci-libs/elpa[openmp] ) mpi? ( sci-libs/elpa[mpi] ) )
	<sci-libs/wannier90-4:=
"
# wannier90-4.0.3:
#/var/tmp/portage/sci-physics/quantum-espresso-7.6/work/q-e-qe-7.6/EPW/src/pw2wan.f90:245:32:
#
#  245 |     USE w90_io,           ONLY : post_proc_flag
#      |                                1
#Error: Symbol ‘post_proc_flag’ referenced at (1) not found in module ‘w90_io’
# thus patches remain commented

DEPEND="${RDEPEND} \
	sys-devel/gcc[fortran]
"
BDEPEND=""

src_prepare() {
	cmake_src_prepare

	# patching to zero length was failing
	#rm ${S}/cmake/FindWannier90.cmake || die
}

src_configure() {
	append-fflags -fallow-argument-mismatch
        local mycmakeargs=(
                -DQE_ENABLE_LIBXC="$(usex libxc)"
                -DQE_ENABLE_MPI="$(usex mpi)"
                -DQE_ENABLE_OPENMP="$(usex openmp)"
                -DQE_ENABLE_HDF5="$(usex hdf5)"
                -DQE_ENABLE_ELPA="$(usex elpa)"
                -DQE_ENABLE_SCALAPACK="$(usex scalapack)"
		-DQE_WANNIER90_INTERNAL="off"
        )
        cmake_src_configure
}

src_install() {
	cmake_src_install
	dolib.so ${BUILD_DIR}/external/mbd/src/libmbd.so
}

pkg_postinst () {
	if ! has_version sci-libs/pslibrary;
		then
		elog
		elog "If pseudo-potentials are needed"
		elog "you can merge =sci-libs/pslibrary-9999"
		elog
	fi
}