[gentoo-dev] new eclass: meson.eclass for the meson build system

[William Hubbs <williamh@gentoo.org>]

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All,

the following is my proposed eclass for handling packages that use the
meson build system.

Please let me know what you think.

William


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# Copyright 2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: meson.eclass
# @MAINTAINER:
# William Hubbs <williamh@gentoo.org>
# @BLURB: common ebuild functions for meson-based packages
# @DESCRIPTION:
#
# @EXAMPLE:
# Typical ebuild using meson.eclass:
#
# @CODE
# EAPI=6
#
# inherit meson
#
# ...
#
# src_configure() {
# 	local mymesonargs=(
# 		-Dqt4=$(usex qt4 true false)
# 		-Dthreads=$(usex threads true false)
# 		-Dtiff=$(usex tiff true false)
# 	)
# 	meson_src_configure
# }
#
# ...
#
# @CODE

case ${EAPI:-0} in
	6) ;;
	*) die "EAPI=${EAPI} is not supported" ;;
esac

EXPORT_FUNCTIONS src_configure src_compile src_install src_test

if [[ -z ${_MESON} ]]; then
_MESON=1

	inherit ninja-utils toolchain-funcs

DEPEND=">=dev-util/meson-0.39.1
	>=dev-util/ninja-1.7.2"

# @ECLASS-VARIABLE: BUILD_DIR
# @DEFAULT_UNSET
# @DESCRIPTION:
# Build directory, location where all generated files should be placed.
# If this isn't set, it defaults to ${WORKDIR}/${P}_build.

# @ECLASS-VARIABLE: EMESON_SOURCE
# @DEFAULT_UNSET
# @DESCRIPTION:
# The location of the source files for the project;this is the source
# directory to pass to meson.
# If this isn't set, it defaults to ${S}

# @VARIABLE: mymesonargs
# @DEFAULT_UNSET
# @DESCRIPTION:
# Optional meson arguments as Bash array; this should be defined before
# calling meson_src_configure.

# create a cross file for meson
# fixme: populate one instead of just touching it
_create_cross_file() {
	touch "${T}"/meson.crossfile
}

# set the build directory
_set_build_dir(){
		BUILD_DIR="${BUILD_DIR:-${WORKDIR}/${P}-build}"
}

# @FUNCTION: meson_src_configure
# @DESCRIPTION:
# this is the meson_src_configure function
meson_src_configure() {
	debug-print-function ${FUNCNAME} "$@"

	# Common args
	local mesonargs=(
		--buildtype plain
		--libdir "$(get_libdir)"
		--localstatedir "${EPREFIX}/var/lib"
		--prefix "${EPREFIX}"/usr
		--sysconfdir "${EPREFIX}/etc"
		)

	if tc-is-cross-compiler; then
		_create_cross_file || die "unable to write meson cross file"
		mesonargs+=(
			--cross-file "${T}"/meson.crossfile
		)
	fi

	# Append additional arguments from ebuild
	mesonargs+=("${mymesonargs[@]}")

	_set_build_dir
	set -- meson "${mesonargs[@]}" "$@" \
		"${EMESON_SOURCE:-${S}}"  "${BUILD_DIR}"
	echo "$@"
	"$@" || die
}

# @FUNCTION: meson_src_compile
# @DESCRIPTION:
# This is the meson_src_compile function.
meson_src_compile() {
	debug-print-function ${FUNCNAME} "$@"

	eninja -v -C "${BUILD_DIR}" || die
}

# @FUNCTION: meson_src_test
# @DESCRIPTION:
# this is the meson_src_test function.
meson_src_test() {
	debug-print-function ${FUNCNAME} "$@"

	eninja -C "${BUILD_DIR}" test || die
}

# @FUNCTION: meson_src_install
# @DESCRIPTION:
# this is the meson_src_install function.
meson_src_install() {
	debug-print-function ${FUNCNAME} "$@"

	DESTDIR="${ED}" eninja -C "${BUILD_DIR}" install || die
}

fi

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