#!/bin/bash

# Define the function to get the list of running GUI applications
running_gui_apps() {
    applications=()

    # loop through all open windows (ids)
    for win_id in $( wmctrl -l | cut -d' ' -f1 ); do 

        # test if window is a normal window
        if  $( xprop -id $win_id _NET_WM_WINDOW_TYPE | grep -q _NET_WM_WINDOW_TYPE_NORMAL ) ; then 

            # get the process ID of the window
            pid=$( xprop -id $win_id _NET_WM_PID | cut -d' ' -f3 )

            # get the process name from the process ID using ps
            pname=$( ps -p $pid -o comm= )

            # add to result list
            applications+=( "$pname" ) 

        fi

    done

    # sort result list and remove duplicates  
    readarray -t applications < <(printf '%s\0' "${applications[@]}" | sort -z | xargs -0n1 | uniq)

    printf '%s\n' "${applications[@]}" 
}

# Call the function to get the list of running GUI applications
apps=$(running_gui_apps)

# Replace newline characters with spaces using tr
apps=$(echo "$apps" | tr '\n' ' ')

# Use killall with the -STOP option and the modified apps variable to stop the applications
killall -STOP $apps