dev-util/gersemi: use optfeature to advertise dev-python/colorama

Signed-off-by: Pavel Sobolev <contact@paveloom.dev>

dev-util/gersemi/gersemi-0.25.1.ebuild

@@ -6,7 +6,7 @@ EAPI=8
 DISTUTILS_USE_PEP517=setuptools
 PYTHON_COMPAT=( python3_{11..14} )
 
-inherit distutils-r1
+inherit distutils-r1 optfeature
 
 DESCRIPTION="A formatter to make your CMake code the real treasure"
 HOMEPAGE="https://github.com/BlankSpruce/gersemi"
@@ -15,15 +15,12 @@ SRC_URI="https://github.com/BlankSpruce/gersemi/archive/refs/tags/${PV}.tar.gz -
 LICENSE="MPL-2.0"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="+color"
 
 RDEPEND="
 	dev-python/ignore-python[${PYTHON_USEDEP}]
 	dev-python/lark[${PYTHON_USEDEP}]
 	dev-python/platformdirs[${PYTHON_USEDEP}]
 	dev-python/pyyaml[${PYTHON_USEDEP}]
-
-	color? ( dev-python/colorama[${PYTHON_USEDEP}] )
 "
 BDEPEND="
 	test? (
@@ -33,3 +30,7 @@ BDEPEND="
 "
 
 distutils_enable_tests pytest
+
+pkg_postinst() {
+	optfeature "colorized diffs support" dev-python/colorama
+}