#!@bash@

# Copyright (C) 2011, 2013-2014, 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] [--] [PROGRAM [ARGS...]]" "$0"
	print 'Use Emacs as a terminal emulator'
	echo
	print \
'If ARGS contains anything beginning with "-", then you will need to put
"--" before PROGRAM so that it does not get treated as part of OPTIONS.'
	echo
	print 'If PROGRAM is not given, the default is "${SHELL:-/bin/sh}".'
	echo
	print 'The following OPTIONS are accepted:'
	emacs_usage
	flag "-T $(_ FUNCTION)" 'Use Emacs Lisp FUNCTION instead of "term"'
}


main() {
	declare -a flags=()
	declare fn=term
	declare -a prog=("${SHELL:-/bin/sh}")
	declare mode=normal

	emacs_getopt_init
	declare args
	if ! args="$(emacs_getopt T: '' "$@")"; then
		mode=error
	else
		eval set -- "$args"
		while true; do
			case "$1" in
				-V|--version) shift; mode=version;;
				-H|--help) shift; mode=usage;;
				-T) fn="$2"; shift 2;;
				--) shift; break;;
				*)
					if [[ $1 =~ $emacs_getopt_2 ]]; then
						flags+=("$1" "$2"); shift 2
					else
						flags+=("$1"); shift 1
					fi
					;;
			esac
		done
		if [[ $# -gt 0 ]]; then
			prog=("$@")
		fi
	fi

	next "$mode" \
	     emacsclient "${flags[@]}" --eval \
	     "($fn $(emacs_quote "$(args2program "${prog[@]}")"))"
}

args2program() {
	local program
	if [ $# = 1 ]; then
		program="$1"
	else
		program="$(mktemp -t -- "${0##*/}.XXXXXXXXXX")"
		{
			echo '#!@bash@'
			echo '{'
			echo 'rm -f -- "$0"'
			printf '%q ' exec -- "$@"
			echo '}'
		} > "$program"
		chmod 755 "$program"
	fi
	printf '%s\n' "$program"
}

main "$@"