run_or_raise

#!/bin/bash
#A Script written just for fun to switch between windows of the same application if more than 1 is running or to launch a new instance of that app if none are running
#Takes two parameters, second is optional, is usually the application name invoked with custom arguments
#Uses wmctrl and xprop
#Assumes that your Window Manager is EWMH compliant
#Useful for switching between normal and private browsing modes of Chrome and Firefox and sometimes annoying Auto-popups of the file manager due to flash drive mounting
#TODO Use Title searches to switch between similarly titled windows
#Most echo statements here are for debugging purposes

#An array containing the Window IDs (WIDs) of the app class you want to switch to.
#We use a case-insensitive grep because the Classnames of many apps are Capitalized whereas the command to launch them maybe in lowercase
ARRAY1=(`wmctrl -x -l | grep -i $1 | cut -d' ' -f1`)
#Number of windows of the app
COUNT=${#ARRAY1[@]}
echo "$COUNT windows of $1 open"

#If more than 1 window open, we switch between the windows
if [ $COUNT -gt 1 ]; then
	#We get the WID of the current open window
	CURRID=`xprop -root _NET_ACTIVE_WINDOW | cut -d, -f1 | cut -d' ' -f5`
	#We check if the current window is an instance of the application we want to launch
	#Due to a quirk of the xprop command whcih seems to cut the leading 0 in the WID (e.g 0x034... becomes 0x34..) we must only grab the relevant characters from wmctrl output
	GREP_OP=$(wmctrl -x -l | grep -i $1 | cut -c1,2,4-10 | grep $CURRID | wc -l)
	if (( $GREP_OP )); then
		echo "Switching between open windows of $1"
		#Activates next Window in array or first window if current window is last element of the array
		for ((i=0; i<COUNT; i++)); do
			echo "PID $i: '${ARRAY1[i]}'"
			if ((${ARRAY1[i]} == $CURRID)); then
				TMP=$(($(($i+1))%$COUNT))
				wmctrl -i -a ${ARRAY1[$TMP]}
				exit
			fi
		done
	else
		#Else, simply change focus to the oldest launched window of the app, done by default by "wmctrl -x -a"
		#TODO: Can also show which app we switched from, but this is useful only for informational purposes
		echo "Focus changed from some other app to $1"
		wmctrl -x -a "$1"
	fi

#If 1 or 0 windows open, we simply activate the open window or launch a new one according to custom arguments if given
else
	echo "Second arg is $2"
	[ -z $2 ] && (wmctrl -x -a $1 || $1) || (wmctrl -x -a $1 || $2)
fi