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# Copyright 2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DESCRIPTION="yacc symlinks"
HOMEPAGE="https://wiki.gentoo.org/wiki/Project:Base/Alternatives"
SRC_URI=""
S=${WORKDIR}
LICENSE="CC0-1.0"
SLOT="0"
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
# 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"
# 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"
newenvd - 90yacc <<-EOF
YACC=byacc
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
}
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