From e773377026c28a1324d074e8af1039cc8c432eb4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Mon, 5 Dec 2022 20:55:32 +0100
Subject: [PATCH] app-alternatives/yacc: Use app-alternatives.eclass
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Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
 app-alternatives/yacc/yacc-1-r2.ebuild | 56 ++++++++++----------------
 1 file changed, 22 insertions(+), 34 deletions(-)

diff --git a/app-alternatives/yacc/yacc-1-r2.ebuild b/app-alternatives/yacc/yacc-1-r2.ebuild
index e748c4e0ab73e..2a3e288c2f8b3 100644
--- a/app-alternatives/yacc/yacc-1-r2.ebuild
+++ b/app-alternatives/yacc/yacc-1-r2.ebuild
@@ -3,54 +3,42 @@
 
 EAPI=8
 
-DESCRIPTION="yacc symlinks"
-HOMEPAGE="https://wiki.gentoo.org/wiki/Project:Base/Alternatives"
-SRC_URI=""
-S=${WORKDIR}
+ALTERNATIVES=(
+	"bison:>=sys-devel/bison-3.8.2-r1"
+	byacc:dev-util/byacc
+	"reference:>=dev-util/yacc-1.9.1-r7"
+)
 
-LICENSE="CC0-1.0"
-SLOT="0"
+inherit app-alternatives
+
+DESCRIPTION="yacc symlinks"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
-IUSE="+bison byacc reference"
-REQUIRED_USE="^^ ( bison byacc reference )"
 
 RDEPEND="
-	bison? ( >=sys-devel/bison-3.8.2-r1 )
-	byacc? ( dev-util/byacc )
-	reference? ( >=dev-util/yacc-1.9.1-r7 )
 	!<dev-util/yacc-1.9.1-r7
 	!<sys-devel/bison-3.8.2-r1
 "
 
 src_install() {
-	if use bison; then
+	local alt=$(get_alternative)
+
+	case ${alt} in
 		# bison installs its own small wrapper script 'yacc-bison'
 		# around bison(1).
-		dosym yacc.bison /usr/bin/yacc
-		newman - yacc.1 <<<".so yacc.bison.1"
+		bison) alt=yacc.bison;;
+		reference) alt=yacc-reference;;
+	esac
 
-		# Leaving this for now to be safe, as it's closer to pre-alternatives
-		# status quo to leave it unset and let autoconf probe for Bison by itself
-		# as it prefers it anyway, and might be a CPP-like situation wrt
-		# calling bison or bison -y if YACC is set.
-		#newenvd - 90yacc <<-EOF
-		#	YACC=yacc.bison
-		#EOF
-	elif use byacc; then
-		dosym byacc /usr/bin/yacc
-		newman - yacc.1 <<<".so byacc.1"
+	dosym "${alt}" /usr/bin/yacc
+	newman - yacc.1 <<<".so ${alt}.1"
 
+	# Leaving this for now to be safe, as it's closer to pre-alternatives
+	# status quo to leave it unset and let autoconf probe for Bison by itself
+	# as it prefers it anyway, and might be a CPP-like situation wrt
+	# calling bison or bison -y if YACC is set.
+	if [[ ${alt} != yacc.bison ]]; then
 		newenvd - 90yacc <<-EOF
-			YACC=byacc
+			YACC=${alt}
 		EOF
-	elif use reference; then
-		dosym yacc-reference /usr/bin/yacc
-		newman - yacc.1 <<<".so yacc-reference.1"
-
-		newenvd - 90yacc <<-EOF
-			YACC=yacc
-		EOF
-	else
-		die "Invalid USE flag combination (broken REQUIRED_USE?)"
 	fi
 }