#!/bin/sh

# The user can specify his prefered WM by setting the WINDOW_MANAGER
# environment variable.
#
# This script has been heavily modified to support Debian's
# alternatives system.

# sm-client-id value
SMID=
# default-wm value
DEFWM=

#read in the arguments
GET=
for n in "$@" ; do
  case "$GET" in
    smid)
	  SMID=$n
	  GET=
	  ;;
    defwm)
	   DEFWM=$n
	   GET=
	   ;;
    *)
      case "$n" in
        --sm-client-id)
			GET=smid
			;;
        --default-wm)
		      GET=defwm
		      ;;
      esac
      ;;
  esac
done

# Get default wm out of x-window-manager
if [ ! "$WINDOW_MANAGER" ]; then
  # Get --default-wm
  if [ "$DEFWM" ]; then
    WINDOW_MANAGER=$DEFWM
    if [ "$WINDOW_MANAGER" = x-window-manager ]; then
      WINDOW_MANAGER=`readlink /etc/alternatives/x-window-manager` 2> /dev/null
    fi
  else
    WINDOW_MANAGER=`readlink /etc/alternatives/x-window-manager` 2> /dev/null
  fi
fi

# If no window manager can be found, we default to xterm
if [ ! "$WINDOW_MANAGER" ]; then
  echo "WARNING: No window manager can be found."
  WINDOW_MANAGER=`readlink /etc/alternatives/x-terminal-emulator` 2> /dev/null
fi

# If there is no xterm, they're really screwed.
if [ ! "$WINDOW_MANAGER" ]; then
  echo "ERROR: No window manager and no xterm!"
  exit 1
fi

# Now create options OPT1 and OPT2 based on the windowmanager used
OPT1=
OPT2=
if [ ! -z "$SMID" ] ; then
  case `basename $WINDOW_MANAGER` in
    sawfish)
	     OPT1=--sm-client-id=$SMID
	     CURRENT=Sawfish
	     ;;
    metacity)
	      OPT1=--sm-client-id=$SMID
	      CURRENT=metacity
	      ;;
    enlightenment|twm)
		       OPT1=-clientId
		       OPT2=$SMID
		       CURRENT=Enlightenment
		       ;;
  esac
fi

# Store the selected WM with gconf
gconftool-2 -t string -s "/desktop/gnome/applications/window_manager/default" $WINDOW_MANAGER

exec $WINDOW_MANAGER $OPT1 $OPT2

echo "ERROR: No window manager could run!"
exit 1
