distutils-r1.eclass: Use config_settings with maturin

Replaces the deprecated MATURIN_PEP517_ARGS and will also
allow ebuilds to enable/disable cargo --features through
DISTUTILS_ARGS like the rest should the need arise.

Support was technically added in 0.15.3, but 1.0.0 allows
passing an array rather than only a to-be-shlex.split string.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>
Closes: https://github.com/gentoo/gentoo/pull/31143
Signed-off-by: Michał Górny <mgorny@gentoo.org>

eclass/distutils-r1.eclass

@@ -1325,6 +1325,28 @@ distutils_pep517_install() {
 
 	local config_settings=
 	case ${DISTUTILS_USE_PEP517} in
+		maturin)
+			# ebuild's DISTUTILS_ARGS are currently ignored if <1.0.0, ebuilds
+			# should set the dependency if used until this can be cleaned up
+			# (reminder to cleanup the old MATURIN_PEP517_ARGS block too)
+			if has_version -b '>=dev-util/maturin-1.0.0'; then
+				# `maturin pep517 build-wheel --help` for options
+				local maturin_args=(
+					"${DISTUTILS_ARGS[@]}"
+					--jobs="$(makeopts_jobs)"
+					--skip-auditwheel # see bug #831171
+					$(in_iuse debug && usex debug '--profile=dev' '')
+				)
+
+				config_settings=$(
+					"${EPYTHON}" - "${maturin_args[@]}" <<-EOF || die
+						import json
+						import sys
+						print(json.dumps({"build-args": sys.argv[1:]}))
+					EOF
+				)
+			fi
+			;;
 		meson-python)
 			local -x NINJAOPTS=$(get_NINJAOPTS)
 			if has_version -b '>=dev-python/meson-python-0.13'; then
@@ -1500,13 +1522,13 @@ distutils-r1_python_compile() {
 			fi
 			;;
 		maturin)
-			# auditwheel may auto-bundle libraries (bug #831171),
-			# also support cargo.eclass' IUSE=debug if available
-			local -x MATURIN_PEP517_ARGS="
-				--jobs=$(makeopts_jobs)
-				--skip-auditwheel
-				$(in_iuse debug && usex debug --profile=dev '')
-			"
+			if has_version -b '<dev-util/maturin-1.0.0'; then
+				local -x MATURIN_PEP517_ARGS="
+					--jobs=$(makeopts_jobs)
+					--skip-auditwheel
+					$(in_iuse debug && usex debug --profile=dev '')
+				"
+			fi
 			;;
 		no)
 			return