#!/bin/bash
#
# Remotty, remote host script, Copyright (C) Jan-Mar 2006, Jeffrey S. Dutky
# version 1.0, 16 March 2006
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND, WITHOUT
# EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
# PURPOSE. IN NO EVENT SHALL THE AUTHOR OF THIS SOFTWARE BE LIABLE FOR DAMAGES
# RESULTING FROM THE USE OF THIS SOFTWARE.
#
# The remotty script creates a session on a remote machine running in an xterm.
# The colors of the xterm are set based on entries in the .hostcolorsrc file.
# The session, by default, uses SSH to connect to the remote system, but either
# telnet or rsh can be used by specifying the -t or -r flags. The initial
# geometry of the xterm window can be set with the -g flag (the default is
# 80x35). The program can be run in a debug mode with the -d flag, and the
# resulting xterm command can be printed (echoed), rather than executed, with
# the -e flag. The names of all the hosts in the .hostcolorsrc file can be
# printed with the -h flag. The -n flag can be used to specify that more than
# one terminal window should be opened to the specified host.

#
# preset program variables
#
VERSION="1.0"
VERDATE="16 March 2006"
COPYRIGHT="2006, Jeffrey S. Dutky"
RHOST=""       # hostname specified on the command line
FHOST=""       # hostname in .hostcolorsrc file host block that matches RHOST
MHOST=""       # hostname in .hostcolorsrc file host block used for lookups
PRG="ssh -X"   # program to use to contact host (defaults to ssh)
BGC=white      # background color
FGC=black      # foreground color
CSR=black      # cursor color
HOSTS=""       # flag to dump hostnames from .hostcolorsrc file
DEBUG=""       # debug mode, print lots of stuff as the program runs
ECHO=""        # echo mode, only echo the resulting xterm command, don't run it
TITLE=""       # title to use for xterm window
EXE=""         # executable stuff to put before command
NUM=1          # number of terminal windows to open to the host
GEOM="-geometry 80x35" # default window geometry

#
# process command line parameters
#
while [ "$1" != "" ]
do
	case "$1"
	in
	"-r")
		PRG="rsh"
        ;;
	"-t")
		PRG="telnet"
        ;;
	"-h")
		HOSTS=yes
        ;;
	"-g")
		GEOM="-geometry $2"
		shift
        ;;
	"-n")
		NUM=$2
		shift
		;;
	"-d")
		DEBUG=yes
        ;;
	"-e")
		ECHO=yes
        ;;
    "-x")
        set -x
        ;;
	"-v"|"--version")
		echo "remotty, version $VERSION, $VERDATE"
		echo "Copyright (C) $COPYRIGHT"
		echo "download from http://members.bellatlantic.net/~dutky"
		exit
		;;
	*)
		RHOST="$1"
        ;;
	esac
	shift
done

# display list of hosts, if requested
if [ "$HOSTS" == "yes" ]
then
	if [ "$DEBUG" == "yes" ]
	then
		echo "display list of hosts"
	fi
	while read X Y
	do
		if [ "$X" == "host" ]
		then
			echo "$Y"
		fi
	done < ~/.hostcolorsrc
	exit
fi

#
# check to see that a host was specified, if not, show the usage message
#
if [ "$DEBUG" == "yes" ]
then
	echo "check that a host was specified"
fi
if [ "$RHOST" == "" ]
then
	echo "No host specified. Usage:"
	echo
	echo "  `basename $0` [-d] [-e] [-r] [-t] [-x] [-n num] [-g geometry] hostname"
	echo
	echo "    -d debug output"
	echo "    -e echo command (don't execute)"
	echo "    -g specify XTerm geometry"
	echo "    -n specify how many terminal windows to open"
	echo "    -r use rsh instead of ssh"
	echo "    -t use telnet instead of ssh"
	echo "    -x trace output (bash 'set -x')"
	echo
	echo "  `basename $0` -h"
	echo
	echo "    -h list hostnames from configuration file (~/.hostcolorsrc)"
	echo
	echo "version $VERSION, Copyright (C) $COPYRIGHT, dutky@bellatlantic.net"
	echo "you can get this program at http://members.bellatlantic.net/~dutky"
	exit
fi

#
# load colors for specified host from the ~/.hostcolorsrc file
#
if [ "$DEBUG" == "yes" ]
then
	echo "load colors for the host $RHOST"
fi
while read -a ELEM
do
	if [ "${ELEM[0]}" == "host" ]
	then # see if the requested remote host is in the host name list
		I=1
		while [ "${ELEM[I]}" != "" ]
		do
			if [ "$DEBUG" == "yes" ]
			then
				echo -n "  is \"${ELEM[I]}\" = \"$RHOST\"? "
			fi
			if [ "${ELEM[I]}" == "$RHOST" ]
			then
				if [ "$DEBUG" == "yes" ]
				then
					echo "yes"
				fi
				FHOST="${ELEM[I]}" # host name that matches requested host
				MHOST="${ELEM[1]}" # host name that can be used for lookups
			else
				if [ "$DEBUG" == "yes" ]
				then
					echo "no"
				fi
			fi
			I=$((I+1))
		done
		continue
	fi
	if [ "$FHOST" == "$RHOST" ]
	then # if the current host block matches the requested host, use the values
		if [ "$DEBUG" == "yes" ]
		then
			echo "    evaluate \"${ELEM[*]}\""
		fi
		case "${ELEM[0]}"
		in
		"fgc")
			FGC="${ELEM[1]}"
			;;
		"bgc")
			BGC="${ELEM[1]}"
			;;
		"csr")
			CSR="${ELEM[1]}"
			;;
        "title")
			if [ "$TITLE" == "" ]
			then
				TITLE=${ELEM[1]}
				N=2
				while [ "${ELEM[N]}" != "" ]
				do
					TITLE="$TITLE ${ELEM[N]}"
					N=$((N+1))
				done
			fi
			;;
        "prg")
			PRG=${ELEM[1]}
			N=2
			while [ "${ELEM[N]}" != "" ]
			do
				PRG="$PRG ${ELEM[N]}"
				N=$((N+1))
			done
			;;
		"noprg")
			PRG=""
			;;
        "exe")
			EXE=${ELEM[1]}
			N=2
			while [ "${ELEM[N]}" != "" ]
			do
				EXE="$EXE ${ELEM[N]}"
				N=$((N+1))
			done
			EXE="$EXE;"
			;;
		"end")
			FHOST=""
            ;;
		esac
	fi
done < ~/.hostcolorsrc

#
# launch a copy of xterm in the background
#
if [ "$DEBUG" == "yes" ]
then
	echo "TITLE='$TITLE'"
fi
if [ "$TITLE" == "" ]
then
	TITLE=$RHOST
fi
if [ "$DEBUG" == "yes" ]
then
	echo "PRG='$PRG'"
fi
if [ "$PRG" == "" ]
then
	CMD="${EXE}xterm $GEOM -T '$TITLE' -bc -sb -sl 1000 -cr $CSR -fg $FGC -bg $BGC"
else
	CMD="${EXE}xterm $GEOM -T '$TITLE' -bc -sb -sl 1000 -cr $CSR -fg $FGC -bg $BGC -e $PRG $MHOST"
fi
if [ "$ECHO" == "yes" ]
then
	if [ $NUM -gt 1 ]
	then
		echo "$NUM copies of:"
		echo -n "    "
	fi
	echo "$CMD"
else
	N=0
	while [ $N -lt $NUM ]
	do
		eval "$CMD" &
		N=$((N+1))
	done
fi