#!/bin/bash

# Share a part of an unseen screen to a vncviewer at host
#
# On HOST, please use:
# startx -- /usr/bin/vncviewer -listen 5500 -ViewOnly -Shared

OUTPUT="VGA-1"
HOST="192.168.6.5"
ORIENTATION=" --left-of LVDS-1"

# Screen Properties
YEXT=1920
YOFF="+0"
XEXT=1200
XOFF="+600"
REFRESH=60.00


# Generate a valid modeline
modeline=$(cvt $YEXT $XEXT $REFRESH | grep "Modeline")

MODENAME=$(echo $modeline | sed -e "s#Modeline ##" | awk '{print $1}' | sed -e 's#"##g')
MODELINE=$(echo $modeline | cut -d ' ' -f3- )

##################################################################
# All of the Voodoo
##################################################################
# Add modeline
xrandr --newmode $MODENAME $MODELINE

# Add modeline to unused output
xrandr --addmode $OUTPUT $MODENAME

# set mode and orientation for output
xrandr --output $OUTPUT --mode $MODENAME $ORIENTATION

# Start vncserver, push to host
x11vnc -cursor -clip ${MODENAME}${XOFF}${YOFF} -connect_or_exit $HOST

# Disable output
xrandr --output $OUTPUT --auto
# remove  from output
xrandr --delmode $OUTPUT $MODENAME
# remove from server
xrandr --rmmode $MODENAME