#!@bash@

# Copyright (C) 2014, 2016 Luke Shumaker <lukeshu@sbcglobal.net>
#
# This file is not considered part of GNU Emacs.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

m4_include(common.sh.in)

usage() {
	print 'Usage: %q [OPTIONS] FILE_A FILE_B' "$0"
	print '   or: %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 cmd=ediff
	declare mode=normal

	emacs_getopt_init
	declare args
	if ! args="$(emacs_getopt 3r recursive "$@")"; then
		mode=error
	else
		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} ]] || mode=error
		fi
	fi

	next "$mode" \
	     emacsclient "${flags[@]}" --eval \
	     "(${cmd}${cnt#2} $(emacs_quote "${files[@]}"))"
}

main "$@"