#!/bin/sh

# Options
# --------------------------------------------------
XNEST_GEOMETRY="-geometry 1024x768+0+0"
if [ "$1" = "-h" ]; then
    echo "xnest [options] [display]"
    echo "  -h : this help"
    echo "  -2 : window twice as wide to leave a space for the notes"
    exit 0
fi
if [ "$1" = "-2" ]; then
    XNEST_GEOMETRY="-geometry 2048x768+0+0"
    shift
fi

# Configuration
# --------------------------------------------------
XNEST=/usr/bin/X11/Xnest
# TWM is very light:
WM="/usr/bin/twm -f $HOME/.twmrc.projection"
#WM=fluxbox
XTERM=/usr/bin/rxvt
XTERM_FONT=-adobe-courier-medium-r-normal--*-100-*-*-m-*-iso8859-1

#GEOMETRY="-geometry 800x600+0+-10"

# Selecting a display
# --------------------------------------------------
# If $DISPLAY=:x.y then DISPLAY_NUMBER=x
DISPLAY_NUMBER=`echo $DISPLAY | cut -d "." -f1 | cut -b 2-`

if [ "x$1" = "x" ]; then
    NEW_DISPLAY=$[ $DISPLAY_NUMBER + 1 ]
    NEW_DISPLAY=":$NEW_DISPLAY"
else
    NEW_DISPLAY=$1
fi

# Setup xauth to allow you through and run Xnest
# --------------------------------------------------
HOSTNAME=`hostname`
XAUTH_KEY=$(xauth list | grep "$HOSTNAME" | grep ":$DISPLAY_NUMBER ")
# Do not put '"' around $XAUTH_KEY for several consecutive spaces to
# be reduced to only one:
XAUTH_KEY=$(echo $XAUTH_KEY | cut -d " " -f 3)
xauth add $NEW_DISPLAY MIT-MAGIC-COOKIE-1 $XAUTH_KEY

echo "Starting Xnest on display $NEW_DISPLAY"
# xnest does not set a WM_CLASS which makes impossible for the WM to set
# specific properties...
# -kb for french keyboard
$XNEST $XNEST_GEOMETRY -kb -name xnest $NEW_DISPLAY &

# Launch some clients
# --------------------------------------------------
$WM -display $NEW_DISPLAY &
DISPLAY=$NEW_DISPLAY  fbsetbg $HOME/images/Debian_Wallpaper.png

cd $HOME
$XTERM -display $NEW_DISPLAY -geometry x7+5+5 -fn $XTERM_FONT &

exit 0

# P.S. xrandr might also be interesting.