games-emulation/m64py: Add archive support USE flags and deps

games-emulation/m64py/m64py-0.2.4.ebuild

@@ -14,13 +14,26 @@ SRC_URI="mirror://sourceforge/m64py/${P}.tar.gz"
 LICENSE="GPL-3 LGPL-3 public-domain GPL-2 BSD CC-BY-SA-3.0"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
-IUSE=""
+IUSE="7z rar"
 
 RDEPEND="
 	dev-python/PyQt5[gui,opengl,widgets,${PYTHON_USEDEP}]
 	dev-python/PySDL2[${PYTHON_USEDEP}]
 	media-libs/libsdl2[joystick,video]
-	>=games-emulation/mupen64plus-core-2.5:0/2-sdl2"
+	>=games-emulation/mupen64plus-core-2.5:0/2-sdl2
+	7z? (
+		|| (
+			dev-python/pylzma[${PYTHON_USEDEP}]
+			app-arch/p7zip
+		)
+	)
+	rar? (
+		|| (
+			dev-python/rarfile[${PYTHON_USEDEP}]
+			app-arch/unrar
+			app-arch/rar
+		)
+	)"
 
 python_prepare_all() {
 	# set the correct search path
@@ -33,19 +46,6 @@ _EOF_
 
 pkg_postinst() {
 	xdg_desktop_database_update
-
-	if ! type -P rar >/dev/null && ! type -P unrar >/dev/null; then
-		elog
-		elog "In order to gain RAR archive support, please install either app-arch/rar"
-		elog "or app-arch/unrar."
-	fi
-
-	if ! type -P 7z >/dev/null \
-			&& ! has_version "dev-python/pylzma[${PYTHON_USEDEP}]"; then
-		elog
-		elog "In order to gain 7z archive support, please install either app-arch/p7zip"
-		elog "or dev-python/pylzma."
-	fi
 }
 
 pkg_postrm() {

games-emulation/m64py/metadata.xml

@@ -5,6 +5,10 @@
 		<email>mgorny@gentoo.org</email>
 		<name>Michał Górny</name>
 	</maintainer>
+	<use>
+		<flag name='7z'>Ensure support for .7z archives.</flag>
+		<flag name='rar'>Ensure support for .rar archives.</flag>
+	</use>
 	<upstream>
 		<remote-id type="sourceforge">m64py</remote-id>
 	</upstream>