dtach.in

#!/bin/bash

usage()
{
	cat << _EOF_
dtach - version @PACKAGE_VERSION@, compiled on @BUILD_DATE@.
Usage: dtach -a <socket> <options>
       dtach -A <socket> <options> <command...>
       dtach -c <socket> <options> <command...>
       dtach -n <socket> <options> <command...>
       dtach -N <socket> <options> <command...>
Modes:
  -a		Attach to the specified socket.
  -A		Attach to the specified socket, or create it if it
		  does not exist, running the specified command.
  -c		Create a new socket and run the specified command.
  -n		Create a new socket and run the specified command detached.
  -N		Create a new socket and run the specified command detached,
		  but without forking to the background.
Options:
  -e <char>	Set the detach character to <char>, defaults to ^\.
  -E		Disable the detach character.
  -r <method>	Set the redraw method to <method>. The valid methods are:
		     none: Don't redraw at all.
		   ctrl_l: Send a Ctrl-L character to the program.
		    winch: Send SIGWINCH to the program.
  -z		Disable processing of the suspend key.

Report any bugs to <@PACKAGE_BUGREPORT@>.
_EOF_
}

version()
{
	cat << _EOF_
dtach - version @PACKAGE_VERSION@, compiled on @BUILD_DATE@.
 (C) Copyright 2004-2014 Ned T. Crigler, modified by Devin J. Pohly
_EOF_
}

declare mode= sockname= rv=
declare -a dtmaster_opts=() dtattach_opts=()

case $1 in
	--help|-\?)
		usage
		exit 0
		;;
	--version)
		version
		exit 0
		;;
	-[acnAN])
		mode=${1:1:1}
		;;
	*)
		echo "$0: No mode was specified."
		echo "Try '$0 --help' for more information."
		exit 1
		;;
esac

sockname=$2
if [[ -z $sockname ]]; then
	echo "$0: No socket was specified."
	echo "Try '$0 --help' for more information."
	exit 1
fi

shift 2

while [[ $# -gt 1 ]]; do
	case $1 in
		-E)
			dtattach_opts+=(-e '')
			;;
		-z)
			dtattach_opts+=(-z)
			;;
		-e)
			shift
			if [[ $# -lt 1 ]]; then
				echo "$0: No escape character specified."
				echo "Try '$0 --help' for more information."
				exit 1
			fi
			dtattach_opts+=(-e "$1")
			;;
		-r)
			shift
			if [[ $# -lt 1 ]]; then
				echo "$0: No redraw method specified."
				echo "Try '$0 --help' for more information."
				exit 1
			fi
			dtmaster_opts+=(-r "$1")
			dtattach_opts+=(-r "$1")
			;;
		-*)
			echo "$0: Invalid option '$1'"
			echo "Try '$0 --help' for more information."
			exit 1
			;;
		*)
			break
			;;
	esac
	shift
done

case $mode in
	N)
		dtmaster_opts+=(-n)
		;&
	n)
		dtmaster "$sockname" "${dtmaster_opts[@]}" "$@"
		;;
	A)
		clear
		dtattach "$sockname" "${dtattach_opts[@]}"
		rv=$?
		case $rv in
			0)
				tput cup `tput lines` || tput ll
				echo "[detached]"
				exit 0
				;;
			3)
				tput cup `tput lines` || tput ll
				echo "[EOF - dtach terminating]"
				exit 0
				;;
			2) rm "$sockname" || exit;;
		esac
		;&
	c)
		dtmaster "$sockname" "${dtmaster_opts[@]}" -w "$@" || exit
		;&
	a)
		clear
		dtattach "$sockname" "${dtattach_opts[@]}"
		rv=$?
		case $rv in
			0)
				tput cup `tput lines` || tput ll
				echo "[detached]"
				exit 0
				;;
			3)
				tput cup `tput lines` || tput ll
				echo "[EOF - dtach terminating]"
				exit 0
				;;
		esac
		exit 1
		;;
esac