# -*-eselect-*-  vim: ft=eselect
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

DESCRIPTION="Manage ECJ targets"
MAINTAINER="java@gentoo.org"
VERSION="0.7"

ECJ="${EROOT}/usr/bin/ecj"
ECJ_JAR="${EROOT}/usr/share/eclipse-ecj/ecj.jar"

# find a list of ecj symlink targets, best first.
find_targets() {
	for f in $(ls -r "${ECJ}"-[0-9]* "${ECJ}"-gcj-[0-9]* 2> /dev/null) ; do
		if [[ -f "${f}" ]] ; then
			echo $(basename "${f}")
		fi
	done
}

# get a named or numbered target.
find_target() {
	local target=${1}

	if is_number "${target}" && [[ ${target} -ge 1 ]] ; then
		targets=( $(find_targets ) )
		[[ -z "${targets}" ]] && die -q "No targets found!"
		target=${targets[target-1]}
	fi

	if [[ "${target}" = ecj-[0-9]* || "${target}" = ecj-gcj-[0-9]* ]] \
		&& [[ -f "${EROOT}/usr/bin/${target}" ]] ; then
		echo ${target}
	else
		die -q "Target \"${1}\" doesn't appear to be valid!"
	fi
}

# determine the current target.
get_target() {
	local canonicalised=$(canonicalise "${ECJ}")
	echo $(basename "${canonicalised}")
}

### show action ###

describe_show() {
	echo "Show current ECJ target"
}

do_show() {
	if [[ ${#} -gt 0 ]]; then
		die -q "No parameters allowed."
	fi

	if [[ -L "${ECJ}" ]] ; then
		get_target
		return 0
	elif [[ -e "${ECJ}" ]] ; then
		echo "(not a symlink)" >&2
		return 1
	else
		echo "(unset)" >&2
		return 1
	fi
}

### list action ###

describe_list() {
	echo "List available ECJ targets"
}

do_list() {
	if [[ ${#} -gt 0 ]]; then
		die -q "Usage error: no parameters allowed."
	fi

	local i targets
	targets=( $(find_targets) )

	for (( i = 0; i < ${#targets[@]}; i++ )); do
		[[ ${targets[i]} = $(basename "$(canonicalise "${ECJ}")") ]] \
			&& targets[i]=$(highlight_marker "${targets[i]}")
	done

	write_list_start "Available ECJ targets:"
	write_numbered_list -m "(none found)" "${targets[@]}"
}

### set action ###

describe_set() {
	echo "Set a new ECJ target"
}

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

describe_set_parameters() {
	echo "<target>"
}

do_set() {
	[[ ${1} ]] || die -q "You didn't give me a target name or number."
	[[ ${2} ]] && die -q "Too many parameters. Expected only one."

	local target=$(find_target "${1}")

	rm -f "${ECJ}" "${ECJ_JAR}"

	ln -sf "${target}" "${ECJ}" || die "Couldn't set ${target} symlink."
	mkdir -p $(dirname ${ECJ_JAR})
	[[ "${target}" != ecj-gcj* ]] && target="eclipse-${target}"
	ln -sf "${EROOT}"/usr/share/${target}/lib/ecj.jar ${ECJ_JAR} \
		|| die -q "Wasn't able to set a new provider."
}

### update action ###

describe_update() {
	echo "Set the ECJ target to the latest if the current target is invalid or if the given target is the latest"
}

describe_update_options() {
	echo "target (optional) : Target name (from 'list' action)"
}

describe_update_parameters() {
	echo "<target>"
}

do_update() {
	[[ ${1} ]] && find_target "${1}" >/dev/null
	[[ ${2} ]] && die -q "Too many parameters. Expected only one."

	if [[ ! -f "${ECJ}" ]] || [[ ! -f "${ECJ_JAR}" ]]; then
		local target="${1}"
		if [[ -z "${target}" ]]; then
			local all_targets=( $(find_targets) )
			target=${all_targets}
		fi
		if [[ ${target} ]]; then
			do_set ${target}
		else
			rm -f "${ECJ}" "${ECJ_JAR}"
		fi
	fi
}