Xfce script to provide notification (via libnotify) of workspace changes

wsp_notify

#!/bin/bash

#Name: 		wsp_notify
#Description: 	Using notify-send, pop-up the current workspace number when changing workspaces
#Requires: 	xfce4-notifyd, libnotify, wmctrl
#Debug mode:	bash -xv /path/to/wsp_notify 2>&1 | tee wsp_notify.log

# make sure that only one instance of this script is running per user
lockfile=/tmp/.wsp_notify.$USER.lockfile
if ( set -o noclobber; echo "locked" > "$lockfile") 2> /dev/null; then
  	trap 'rm -f "$lockfile"; exit $?' INT TERM EXIT
  	echo "wsp_notifyDEBUG: Locking succeeded" >&2

  	# on startup, set the CURRENT_WORKSPACE value
  	CURRENT_WORKSPACE=$(($(wmctrl -d | grep \* | cut -d' ' -f1)+1))
  	# get the workspace names (starts at index 2)
	NAMES=(`xfconf-query -c xfwm4 -p /general/workspace_names | grep -v "Value is an array"`)

  	# every second, query the active workspace number and if different from the previous one, send a notification
	while true
	do
		sleep 1
		NEW_WORKSPACE=$(($(wmctrl -d | grep \* | cut -d' ' -f1)+1))	
		NEW_WORKSPACE_NAME="${NAMES[$(($NEW_WORKSPACE-1))]}"
		if [ $CURRENT_WORKSPACE -ne $NEW_WORKSPACE ]; then
			notify-send -t 5 "$(echo Workspace | sed -e :a -e 's/^.\{1,12\}$/ & /;ta')" "<b><span font='110'>$NEW_WORKSPACE</span></b>\n<i>$(echo $NEW_WORKSPACE_NAME | sed -e :a -e 's/^.\{1,17\}$/ & /;ta')</i>"
			CURRENT_WORKSPACE=$NEW_WORKSPACE
		fi
	done

# can't create lockfile - notify user and quit
else
  	echo "wsp_notifyDEBUG: Lock failed, check for existing process and/or lock file and delete - exiting." >&2
  	exit 1
fi			

exit 0