#!/bin/bash -

# script - "xscreensaver.kss"
#
# Author: Shane Smit <shane_smit@calderasystems.com>
#
# Modification History:
#  [08/23/1999] - Shane Smit: Creation
#
# Description:
#  This script file enables users to use XScreenSaver via the
#  KDE Display Properties. 

# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation.  No representations are made about the suitability of this
# software for any purpose.  It is provided "as is" without express or 
# implied warranty.


# Locking is turned off by default.
lockmode="-no-lock-mode"

while [ -n "$1" ]; do
  case "$1" in

    -desc) 
      # This is the name in the list box.
      echo "XScreenSaver"
      exit
      ;;

    -preview)
      # This simply runs xroger in the preview window.  For this to be "real",
      # it needs to run xscreensaver with a -window-id parameter for each hack.
      # There are two ways to do this:
      # 1) Hack xscreensaver to allow global parameters.
      # 2) Hack xscreensaver to accept alternate setup files, and create one on
      #    the fly here.
      shift
      /usr/X11R6/lib/xscreensaver/xroger -delay 1 -window-id $1 &    # Start new preview 
      echo "$!" > $HOME/.kss-preview$1.pid.`hostname`                # Write PID 
      wait $!						             # Wait for it to get killed
      exit
      ;;

    -setup)
      /usr/X11R6/bin/xscreensaver -no-splash &     # daemon must be started
      /usr/X11R6/bin/xscreensaver-demo             # or the setup will produce
      kill $!                                      # a warning.
      exit
      ;;

    -test)
      # I was unable to grep stdout because xscreensaver nabs it. But I was able
      # to output it to a file, and grep the file.
      TEMP_FILE=/tmp/xsc.$RANDOM
      /usr/X11R6/bin/xscreensaver -no-splash -verbose -no-capture-stderr 2> $TEMP_FILE &
      /usr/X11R6/bin/xscreensaver-command -activate
      while true; do
        ExitNow=$(grep -E -c unblanking\|already $TEMP_FILE)
        if [ $ExitNow != 0 ]; then
          kill $!
          rm $TEMP_FILE
          exit
        fi
        sleep 1
      done
      exit	# It should never get this far.
      ;;

#    -corners)
#      echo "Not yet supported"
#      ;;
    -delay)
      shift
      timeout="-timeout $1"
      ;;
    -install)
      Install="TRUE"
      ;;
    -lock)
      if [ ! -f "/etc/shadow" ]; then      
        lockmode="-lock-mode"
      fi
      ;;
#    -allow-root)
#      echo "Not yet supported"
#      ;;
    -nice)
      shift
      Nice="-nice $1"
      ;;
#    -inroot)
#      echo "Not yet supported"
#      ;;
    *)
      echo "Unknown parameter: $1"
      ;;
  esac
  shift
done

if [ -n "$Install" ] ; then
  rm $HOME/.kss-preview*                                # Remove old preview files
  PID_FILE=$HOME/.kss-install.pid.`hostname`
  kill `cat $PID_FILE`                                  # Kill old screensaver 
  echo "$$" > $PID_FILE                                 # Write PID of this script
  /usr/X11R6/bin/xscreensaver -no-splash $timeout $lockmode $Nice &    # Start XScreenSaver daemon
  trap "kill $!" SIGTERM                                # Set these to kill the daemon
  trap "kill $!" SIGKILL

  if [ -f "/etc/shadow" ]; then
    # xscreensaver is run as the user, which has no access to the /etc/shadow file.  Other
    # .kss screensavers use kcheckpass, which would have to be hacked into xscreensaver to
    # work correctly. This just activates the screensaver with no password lock.
    trap "/usr/X11R6/bin/xscreensaver-command -activate" SIGUSR1
  else
    # xscreensaver can be locked, because it can read the /etc/passwd file.
    trap "/usr/X11R6/bin/xscreensaver-command -lock" SIGUSR1
  fi

  wait $!                                               # Do not exit, just wait for signals.

else
  echo "Usage: ./xscreensaver.kss -install|-setup|-test|-desc [-delay num] [-lock] [-nice num]"
#  echo "  -corners xxxx     Placing cursor in corner performs action:"
#  echo "                     x = i  no action (ignore)"
#  echo "                     x = s  save screen"
#  echo "                     x = l  lock screen"
#  echo "                    order: top-left, top-right, bottom-left, bottom-right"
  echo "  -delay num        Amount of idle time before screen saver starts  (default 10min)"
  echo "  -desc             Print the screen saver's description to stdout"
  echo "  -install          Install screen saver"
  echo "  -lock             Require password to stop screen saver"
#  echo "  -allow-root       Accept root password to unlock"
  echo "  -nice num         Run with specified nice value"
  echo "  -preview wid      Run in the specified XWindow"
#  echo "  -inroot           Run in the root window"
  echo "  -setup            Setup screen saver"
  echo "  -test             Invoke the screen saver immediately"
fi

# End of script - "xscreensaver.kss"