#!/bin/sh

# The user can specify his prefered WM by setting the WINDOW_MANAGER
# environment variable.
#
# If this is not set, we search a list of known windowmanagers and use
# the first one that is found in the users's PATH
#
# NOTE: DON'T USE THIS.  Please have your window manager install
# a desktop file and change the mateconf key
# /desktop/mate/session/required_components/windowmanager

# 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

glxinfo |grep "OpenGL renderer"| grep -vi Gallium | grep -q .
IS_X_COMPOSITED=$?

# WINDOW_MANAGER overrides all
if [ -z "$WINDOW_MANAGER" ] ; then
    WINDOW_MANAGER=`gsettings get org.mate.session.required-components windowmanager 2> /dev/null | sed s/\'//g`
fi

if [ "x$WINDOW_MANAGER" = "xmarco-compton" ] && [ $IS_X_COMPOSITED != 0 ]; then
    WINDOW_MANAGER=marco-no-composite
    gsettings set org.mate.session.required-components windowmanager marco-no-composite
fi

if [ "x$WINDOW_MANAGER" = "xmarco-compton" ] && [ $IS_X_COMPOSITED = 0 ]; then
    WINDOW_MANAGER=marco-compton
    gsettings set org.mate.session.required-components windowmanager marco-compton
fi

# Migrate compiz to compiz-manager if possible and needed
if [ "x$WINDOW_MANAGER" = "xcompiz" -o "x$DEFWM" = "xcompiz" ]; then
  which compiz-manager > /dev/null 2>&1
  if [ $? -eq 0 ]; then
    if [ "x$WINDOW_MANAGER" = "xcompiz" ]; then
      WINDOW_MANAGER="compiz-manager"
    fi
    if [ "x$DEFWM" = "xcompiz" ]; then
      DEFWM="compiz-manager"
    fi
  fi
fi

# Avoid looping if the session configuration tells us to use mate-wm or if
# the user forces mate-wm via WINDOW_MANAGER
if [ "x$WINDOW_MANAGER" = "xmate-wm" ]; then
  if [ $IS_X_COMPOSITED = 0 ]; then
    WINDOW_MANAGER="marco-compton"
    gsettings set org.mate.session.required-components windowmanager marco-compton
  else
    WINDOW_MANAGER="marco-no-composite"
    gsettings set org.mate.session.required-components windowmanager marco-no-composite
  fi
fi

if [ -z "$WINDOW_MANAGER" ] ; then
  # Create a list of window manager we can handle, trying to only use the
  # compositing ones when it makes sense

  KNOWN_WM="sawfish sawmill enlightenment icewm wmaker fvwm2 qvwm fvwm twm kwm"

  if [ $IS_X_COMPOSITED -eq 0 ] ; then
    KNOWN_WM="marco-compton mutter compiz-manager compiz beryl $KNOWN_WM"
  fi

  # marco is still the default wm in MATE
  KNOWN_WM="marco $KNOWN_WM"

  OLDIFS=$IFS
  if [ -z "$DEFWM" -o "x$DEFWM" = "xmate-wm" ]; then

    for wm in $KNOWN_WM ; do
      IFS=":"
      for dir in $PATH ; do
        if [ -x "$dir/$wm" ] ; then
          WINDOW_MANAGER="$dir/$wm"
          break 2
        fi
      done
      IFS=$OLDIFS
    done

  else
    WINDOW_MANAGER=$DEFWM
  fi
  IFS=$OLDIFS
fi

# If no window manager can be found, we default to xterm

if [ -z "$WINDOW_MANAGER" ] ; then
  echo "WARNING: No window manager can be found."
  WINDOW_MANAGER=xterm
fi

# Now create options OPT1, OPT2 and OPT3 based on the windowmanager used
OPT1=
OPT2=
OPT3=
OPT4=
if [ ! -z "$SMID" ] ; then
  case `basename $WINDOW_MANAGER` in
    sawfish|sawmill|marco|mutter)
      OPT1=--sm-client-id=$SMID
      ;;
    openbox|enlightenment|e16)
      OPT1=--sm-client-id
      OPT2=$SMID
      ;;
    twm)
      OPT1=-clientId
      OPT2=$SMID
      ;;
    lwm)
      OPT1=-s
      OPT2=$SMID
      ;;
    fvwm)
      OPT1=-i
      OPT2=$SMID
      ;;
    compiz|compiz-manager)
      OPT1=--sm-client-id
      OPT2=$SMID
      ;;
    beryl)
      OPT1=--sm-client-id
      OPT2=$SMID
      ;;
    #FIXME: add all other windowmanagers here with their proper options
  esac
fi

case `basename $WINDOW_MANAGER` in
  compiz)
    #commented lines cause high cpu usage
    #export LIBGL_ALWAYS_INDIRECT=1
    gtk-window-decorator &
    #OPT3=glib
    #OPT4=mateconf
    ;;
  beryl)
    emerald &
    ;;
esac

exec $WINDOW_MANAGER $OPT1 $OPT2 $OPT3 $OPT4

echo "ERROR: No window manager could run!"
