#!@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]" "$0"
	print "   or: %q [OPTIONS] -e COMMAND" "$0"
	print "   or: %q [OPTIONS] -e PROGRAM [ARGS...]" "$0"
	print 'A wrapper around emacsterm that behaves like xterm'
	echo
	print 'The "-e" option cannot be combined with other short options.'
	echo
	print \
'This tool does not (yet?) do any of the mucking around with SHELL,
XTERM_SHELL, /etc/shells, or the user database (/etc/passwd) that xterm
does.  The simplified behavior is that if the "-e" option is not given,
then "${SHELL:-/bin/sh}" is used.'
	echo
	print 'The following OPTIONS are accepted:'
	emacs_usage
	flag "-T $(_ FUNCTION)" 'Use Emacs Lisp FUNCTION instead of "term"'
	flag "-e $(_ 'COMMAND|<PROGRAM [ARGS...]>')" 'Specify the command to execute'
	echo
	print 'Bugs:'
	print \
'The string "-e" cannot be used as an argument to flags that take
arguments.'
}


main() {
	# Run through and check for the -e flag
	declare e=false
	declare -a arg_ary=("$@")
	declare -i i=0
	while [[ $i -lt ${#arg_ary[@]} ]]; do
		case "${arg_ary[$i]}" in
			'-e') e=true; arg_ary[$i]='--'; break;;
			'--') error 'bad command line option "--"'; next error; return $?;;
		esac
		i+=1
	done

	declare -a flags=()
	declare -a prog=()
	declare mode=normal

	emacs_getopt_init
	declare args
	if ! args="$(emacs_getopt T: '' "${arg_ary[@]}")"; then
		mode=error
	else
		# Pretty much identical option parsing to emacsterm
		eval set -- "$args"
		while true; do
			case "$1" in
				-V|--version) shift; mode=version;;
				-H|--help) shift; mode=usage;;
				-T) flags+=("$1" "$2"); shift 2;;
				--) shift; break;;
				*)
					if [[ $1 =~ $emacs_getopt_2 ]]; then
						flags+=("$1" "$2"); shift 2
					else
						flags+=("$1"); shift 1
					fi
					;;
			esac
		done

		# Now for the xterm weirdness
		if ! $e; then
			case $# in
				0) prog=("${SHELL:-/bin/sh}");;
				1) prog=("$1");;
				*) shift; error 'Extra arguments: %s' "$*"; mode=error;;
			esac
		else
			case $# in
				0) getopt -Q -n "$0" e: -e; mode=error;;
				1) prog=(sh -c "$1");;
				*) prog=("$@");;
			esac
		fi
	fi

	next "$mode" \
	     emacsterm "${flags[@]}" -- "${prog[@]}"
}

main "$@"