app-eselect/eselect-zig: add 2

Added more target checks similar to those from zig-utils.eclass,
to avoid incorrect targets added to list (like zig-ebuilder).

Also consistent formatting everywhere and keyworded for s390
(needed for dev-lang/zig-bin 0.14.1).

Signed-off-by: Eric Joldasov <bratishkaerik@landless-city.net>
Part-of: https://github.com/gentoo/gentoo/pull/42374
Signed-off-by: Sam James <sam@gentoo.org>

app-eselect/eselect-zig/eselect-zig-2.ebuild

@@ -0,0 +1,19 @@
+# Copyright 2023-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Manages Zig versions"
+HOMEPAGE="https://wiki.gentoo.org/wiki/No_homepage"
+S="${WORKDIR}"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~s390 ~x86"
+
+RDEPEND="app-admin/eselect"
+
+src_install() {
+	insinto /usr/share/eselect/modules/
+	newins "${FILESDIR}"/zig.eselect-${PVR} zig.eselect
+}

app-eselect/eselect-zig/files/zig.eselect-2

@@ -0,0 +1,133 @@
+# -*-eselect-*-  vim: ft=eselect
+# Copyright 2022-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+DESCRIPTION="Manage Zig versions"
+MAINTAINER="bratishkaerik@landless-city.net"
+VERSION="2"
+
+show_selected_target() {
+	readlink "${EROOT}/usr/bin/zig"
+}
+
+find_targets() {
+	local f name
+	for f in "${EROOT}"/usr/bin/zig-*; do
+		name="$(basename "${f}")"
+
+		[[ "${name}" =~ ^zig(-bin)?-[[:digit:]] ]] || continue
+		[[ -x "${f}" ]] || continue
+		echo "${name}"
+	done
+}
+
+remove_symlinks() {
+	rm "${EROOT}/usr/bin/zig"
+}
+
+set_symlinks() {
+	local target="${1}"
+	if is_number "${target}"; then
+		local targets=( $(find_targets) )
+		target="${targets[target - 1]}"
+	fi
+
+	[[ -z "${target}" || ! -x "${EROOT}/usr/bin/${target}" ]] &&
+		die -q "Target \"${1}\" doesn't appear to be valid!"
+
+	ln -s "${target}" "${EROOT}/usr/bin/zig"
+}
+
+### show action ###
+
+describe_show() {
+	echo "Show current Zig version"
+}
+
+do_show() {
+	write_list_start "Current Zig version:"
+	if [[ -L "${EROOT}/usr/bin/zig" ]]; then
+		write_kv_list_entry "$(show_selected_target)" ""
+	else
+		write_kv_list_entry "(unset)" ""
+	fi
+}
+
+### list action ###
+
+describe_list() {
+	echo "List available Zig versions"
+}
+
+do_list() {
+	local targets=( $(find_targets) )
+	local selected_target
+	selected_target=$(show_selected_target)
+
+	write_list_start "Available Zig versions:"
+	for ((i = 0; i < ${#targets[@]}; i++)); do
+		[[ "${targets[i]}" == "${selected_target}" ]] && targets[i]="$(highlight_marker "${targets[i]}")"
+	done
+	write_numbered_list -m "(none found)" "${targets[@]}"
+}
+
+### set action ###
+
+describe_set() {
+	echo "Set active Zig version"
+}
+
+describe_set_parameters() {
+	echo "<target>"
+}
+
+describe_set_options() {
+	echo "target:      Target name or number (from 'list' action)"
+}
+
+do_set() {
+	[[ -z "${1}" ]] && die -q "You need to specify a target"
+	[[ ${#} -gt 1 ]] && die -q "Too many parameters"
+	test_usr_bin_writeable
+
+	if [[ -L "${EROOT}/usr/bin/zig" ]]; then
+		remove_symlinks || die -q "Couldn't remove symlink"
+	fi
+	set_symlinks "${1}" || die -q "Couldn't set a new symlink"
+}
+
+### update action ###
+
+describe_update() {
+	echo "Automatically update the zig symlink"
+}
+
+describe_update_options() {
+	echo "ifunset: Do not override currently set version"
+}
+
+do_update() {
+	[[ -z "${1}" || "${1}" == ifunset ]] || die -q "Usage error"
+	[[ ${#} -gt 1 ]] && die -q "Too many parameters"
+	test_usr_bin_writeable
+
+	if [[ -L "${EROOT}/usr/bin/zig" ]]; then
+		if [[ "${1}" == ifunset && -e "${EROOT}/usr/bin/zig" ]]; then
+			return
+		fi
+		remove_symlinks
+	elif [[ -e "${EROOT}/usr/bin/zig" ]]; then
+		die -q "\"${EROOT}/usr/bin/zig\" exists but is not a symlink"
+	fi
+
+	local targets=( $(find_targets) )
+	if [[ ${#targets[@]} -gt 0 ]]; then
+		set_symlinks "${targets[${#targets[@]} - 1]}"
+	fi
+}
+
+### helper functions ###
+
+test_usr_bin_writeable() {
+	[[ -w "${EROOT}/usr/bin" ]] || die -q "\"${EROOT}/usr/bin\" not writeable by current user. Are you root?"
+}