#!@bash@

m4_include(common.sh)

usage() {
	print 'Usage: %q [OPTIONS] FILE_A FILE_B' "$0"
	print 'Usage: %q -3 [OPTIONS] FILE_A FILE_B FILE_C' "$0"
	print "Use Emacs' ediff-mode to compare two files"
	echo
	print 'The following OPTIONS are accepted:'
	emacs_usage
	flag '-3' 'Do a 3-way diff instead of 2-way'
	flag '-r, --recursive' 'Diff directories recursively'
}

main() {
	declare -a flags=()
	declare -a files=()
	declare -i cnt=2
	declare error=false
	declare mode=normal
	declare cmd=ediff

	declare args=
	emacs_getopt 3r recursive "$@" || error=true
	eval set -- "$args"
	while true; do
		case "$1" in
			-V|--version) shift; mode=version;;
			-H|--help) shift; mode=usage
			-r|--recursive) shift; cmd=edirs;;
			-3) shift; cnt=3;;
			--) shift; break;;
			*)
				if [[ $1 =~ $emacs_getopt_2 ]]; then
					flags+=("$1" "$2"); shift 2
				else
					flags+=("$1"); shift 1
				fi
				;;
		esac
	done
	files=("$@")
	if [[ $mode == normal ]]; then
		[[ ${#files[@]} = ${cnt} ]] || error=true
	fi

	if $error; then
		usage >&2
		return 1
	fi
	case "$mode" in
		usage) usage; return 0;;
		version) version; return 0;;
	esac

	emacsclient "${flags[@]}" --eval \
		'(select-frame (make-frame))' \
		"(${cmd}${cnt#2} $(emacs_quote "${files[@]}"))"
}

main "$@"