qbs.eclass: new eclass

Signed-off-by: Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in>

eclass/qbs.eclass

@@ -0,0 +1,186 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: qbs.eclass
+# @AUTHOR:
+# Anna Vyalkova <cyber+gentoo@sysrq.in>
+# @MAINTAINER:
+# Anna Vyalkova <cyber+gentoo@sysrq.in>
+# @SUPPORTED_EAPIS: 8
+# @PROVIDES: qmake-utils
+# @BLURB: eclass to build qbs-based packages
+# @DESCRIPTION:
+# Utility eclass providing wrapper functions for Qbs build system.
+
+if [[ ! ${_QBS_ECLASS} ]]; then
+
+case ${EAPI} in
+	8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI} unsupported."
+esac
+
+inherit multiprocessing toolchain-funcs qmake-utils
+
+# @ECLASS-VARIABLE: QBS_COMMAND_ECHO_MODE
+# @USER_VARIABLE
+# @DESCRIPTION:
+# Determines what kind of output to show when executing commands.  Possible
+# values are:
+#
+# - silent
+#
+# - summary
+#
+# - command-line (the default)
+#
+# - command-line-with-environment
+: ${QBS_COMMAND_ECHO_MODE:=command-line}
+
+BDEPEND="dev-util/qbs"
+
+EXPORT_FUNCTIONS src_configure src_compile src_install
+
+# @FUNCTION: eqbs
+# @USAGE: [<qbs args>...]
+# @DESCRIPTION:
+# Run Qbs. This command dies on failure.
+eqbs() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	set -- qbs "${@}"
+	einfo "${@}"
+	"${@}" || die -n
+
+	local ret=${?}
+	return ${ret}
+}
+
+# @FUNCTION: _flags_to_js_array
+# @INTERNAL
+# @USAGE: [<flags>...]
+# @RETURN: arguments quoted and separated by comma
+_flags_to_js_array() {
+	if [[ ! ${@} ]]; then
+		echo "[]"
+	else
+		local -a array
+		printf -v array "'%s', " "${@}"
+		echo "[${array%, }]"
+	fi
+}
+
+# @FUNCTION: _filter_ldflags
+# @INTERNAL
+# @USAGE: [<ldflags>...]
+# @RETURN: flags for the linker (with -Wl and -Xlinker removed)
+_filter_ldflags() {
+	local -a flags
+	while [[ ${@} ]]; do
+		if [[ ${1} == -Wl,* ]]; then
+			IFS=, read -ra flags <<< "${1#-Wl,}"
+			printf "%s " "${flags[@]}"
+		elif [[ ${1} == -Xlinker ]]; then
+			shift
+			printf "%s " "${1}"
+		fi
+		shift
+	done
+}
+
+# @FUNCTION: qbs_src_configure
+# @DESCRIPTION:
+# Setup toolchain and Qt for the "gentoo" profile.
+# Set Qbs preferences to match user settings. Configure build flags and
+# installation prefix.
+qbs_src_configure() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	eqbs setup-toolchains "$(tc-getCC)" gentooToolchain
+	eqbs config profiles.gentooToolchain.archiverPath "$(tc-getAR)"
+	eqbs config profiles.gentooToolchain.assemblerPath "$(tc-getAS)"
+	eqbs config profiles.gentooToolchain.nmPath "$(tc-getNM)"
+	eqbs config profiles.gentooToolchain.objcopyPath "$(tc-getOBJCOPY)"
+	eqbs config profiles.gentooToolchain.stripPath "$(tc-getSTRIP)"
+
+	eqbs setup-qt "$(qt5_get_bindir)/qmake" gentoo
+	qbs_config baseProfile gentooToolchain
+
+	qbs_config preferences.jobs "$(makeopts_jobs)"
+	if [[ "${NOCOLOR}" == true || "${NOCOLOR}" == yes ]]; then
+		qbs_config preferences.useColoredOutput false
+	fi
+
+	qbs_config qbs.installPrefix "${EPREFIX}/usr"
+	qbs_config qbs.sysroot "${ESYSROOT}"
+	qbs_config qbs.optimization ""  # don't add unwanted flags
+
+	qbs_config cpp.cFlags "$(_flags_to_js_array ${CFLAGS})"
+	qbs_config cpp.cppFlags "$(_flags_to_js_array ${CPPFLAGS})"
+	qbs_config cpp.cxxFlags "$(_flags_to_js_array ${CXXFLAGS})"
+	qbs_config cpp.linkerFlags "$(_flags_to_js_array $(_filter_ldflags ${LDFLAGS}))"
+}
+
+# @FUNCTION: qbs_config
+# @USAGE: <key> <value>
+# @DESCRIPTION:
+# Set a preference for the "gentoo" profile.
+qbs_config() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(( $# == 2 )) || \
+		die "${FUNCNAME} takes exactly two arguments"
+
+	local key=${1}
+	local value=${2}
+
+	eqbs config "profiles.gentoo.${key}" "${value}"
+}
+
+# @FUNCTION: qbs_src_compile
+# @USAGE: [<qbs args>...]
+# @DESCRIPTION:
+# General function for compiling with qbs. All arguments are passed
+# to qbs_build.
+qbs_src_compile() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	qbs_build "${@}"
+}
+
+# @FUNCTION: qbs_build
+# @USAGE: [<qbs args>...]
+# @DESCRIPTION:
+# Build the package using qbs build.
+qbs_build() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	local qbsargs=(
+		--no-install
+		--command-echo-mode "${QBS_COMMAND_ECHO_MODE}"
+		profile:gentoo
+		config:release
+	)
+
+	eqbs build "${@}" "${qbsargs[@]}"
+}
+
+# @FUNCTION: qbs_src_install
+# @USAGE: [<qbs args>...]
+# @DESCRIPTION:
+# Install the package using qbs install.
+qbs_src_install() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	local qbsargs=(
+		--no-build
+		--install-root "${D}"
+		--command-echo-mode "${QBS_COMMAND_ECHO_MODE}"
+		profile:gentoo
+		config:release
+	)
+
+	eqbs install "${@}" "${qbsargs[@]}"
+}
+
+_QBS_ECLASS=1
+fi