#!/bin/sh
#
# vncdisplay - print the name of the VNC display, first starting
#              the vncserver if none is available for me
#
# $Id$

FirstVncDisplayOfMine()
{
  env PATH=/usr/sbin:${PATH} lsof -c Xvnc |
  awk '$3 == "'`whoami`'" && $NF == "(LISTEN)" && $(NF-1) ~ /:59/ {
    print $(NF-1); exit
  }' | awk -F: '{print $1 ":" $(NF)-5900}'
}

FirstVncDisplayOfMine |
if read displayname
then
  echo $displayname
elif vncserver -localhost -depth 16 -geometry 1600x1200
then
  FirstVncDisplayOfMine
else
  echo $0: cannot start VNC server 1>&2
  exit 1
fi