# -*-eselect-*-  vim: ft=eselect
# Copyright 2013-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2 or later
# $Id: $

DESCRIPTION="Manage the /usr/bin/gradle symlink"
MAINTAINER="flo@geekplace.eu"
VERSION=0.1

# find a list of gradle symlink targets
find_targets() {
	local f
	for f in "${EROOT}"/usr/bin/gradle?(-bin)-[[:digit:]]*; do
		[[ -x ${f} ]] && basename "${f}"
	done
}

remove_symlink() {
	rm "${EROOT}/usr/bin/gradle" \
		|| die -q "Could not remove symlink"
}

set_symlink() {
	local target=$1

	if is_number "${target}"; then
		local targets=( $(find_targets) )
		target=${targets[target-1]}
	fi

	[[ -z ${target} ]] \
		&& die -q "Target \"${1}\" doesn't apper to be valid!"

	[[ ! -x ${EROOT}/usr/bin/${target} ]] \
		&& die -q "${EROOT}/usr/bin/${target} is not an executable"

	ln -s "${target}" "${EROOT}/usr/bin/gradle" \
		|| die -q "Could not set symlink"
}

describe_show() {
	echo "Shows the current gradle symlink"
}

do_show() {
	write_list_start "Current gradle symlink:"
	if [[ -L ${EROOT}/usr/bin/gradle ]]; then
		local gradle=$(cannonicalise "${EROOT}/usr/bin/gradle")
		write_kv_list_entry "${gradle}" ""
	else
		write_kv_list_entry "(unset)" ""
	fi
}

describe_list() {
	echo "list available gradle symlink targets"
}

do_list() {
	local i targets=( $(find_targets) )

	write_list_start "Available gradle symlink targets:"
	for (( i = 0; i < ${#targets[@]}; i++ )); do
		# highligh the target where the symlink is pointing to
		[[ ${targets[i]} = \
			$(basename "$(canonicalise "${EROOT}/usr/bin/gradle")") ]] \
			&& targets[i]=$(highlight_marker "${targets[i]}")
	done
	write_numbered_list -m "(none found)" "${targets[@]}"
}

describe_set() {
	echo "Set a new gradle symlink target"
}

describe_set_parameters() {
	echo "<target>"
}

describe_set_options() {
	echo "target : Target name or number (from 'list' action)"
}

do_set() {
	[[ -z $1 ]] && die -q "You didn't tell me what to set the symlink to"
	[[ $# -gt 1 ]] && die -q "Too many parameters"
	test_for_root

	if [[ -L ${EROOT}/usr/bin/gradle ]]; then
		# existing symmlink
		remove_symlink
		set_symlink "$1"
	elif [[ -e ${EROOT}/usr/bin/gradle ]]; then
		# we have someting strange
		die -q "${EROOT}/usr/bin/gradle exists but is not a symlink"
	else
		set_symlink "$1"
	fi
}

describe_update() {
	echo "Automatically update the gradle 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_for_root

	if [[ -L ${EROOT}/usr/bin/gradle ]]; then
		if [[ $1 == ifunset && -e ${EROOT}/usr/bin/gradle ]]; then
			return
		fi
		remove_symlink
	elif [[ -e ${EROOT}/usr/bin/gradle ]]; then
		die -q "${EROOT}/usr/bin/gradle exists but is not a symlink"
	fi

	local targets=( $(find_targets) )
	if [[ ${#targets[@]} -gt 0 ]]; then
		set_symlink "${targets[${#targets[@]}-1]}"
	fi
}

test_for_root() {
	[[ -w ${EROOT}/usr/bin ]] || die -q "${EROOT}/usr/bin not writeable by current user. Are you root?"
}