Is it possible to set to turn off only those monitors that do not play anything in xubuntu 18.04?

Question

linux

Implemented smart shutdown of monitors using lightsOn.sh, is it possible to somehow implement the feature of turning off monitors on which nothing is played?

Script code:

spoiler

#!/bin/bash
# lightsOn.sh

# Copyright (c) 2013 iye.cba at gmail com
# url: https://github.com/iye/lightsOn
# This script is licensed under GNU GPL version 2.0 or above

# Description: Bash script that prevents the screensaver and display power
# management (DPMS) to be activated when you are watching Flash Videos
# fullscreen on Firefox and Chromium.
# Can detect mplayer, minitube, and VLC when they are fullscreen too.
# Also, screensaver can be prevented when certain specified programs are running.
# lightsOn.sh needs xscreensaver or kscreensaver to work.


# HOW TO USE: Start the script with the number of seconds you want the checks
# for fullscreen to be done. Example:
# "./lightsOn.sh 120 &" will Check every 120 seconds if Mplayer, Minitube
# VLC, Firefox or Chromium are fullscreen and delay screensaver and Power Management if so.
# You want the number of seconds to be ~10 seconds less than the time it takes
# your screensaver or Power Management to activate.
# If you don't pass an argument, the checks are done every 50 seconds.
#
# An optional array variable exists here to add the names of programs that will delay the screensaver if they're running.
# This can be useful if you want to maintain a view of the program from a distance, like a music playlist for DJing,
# or if the screensaver eats up CPU that chops into any background processes you have running,
# such as realtime music programs like Ardour in MIDI keyboard mode.
# If you use this feature, make sure you use the name of the binary of the program (which may exist, for instance, in /usr/bin).


# Modify these variables if you want this script to detect if Mplayer,
# VLC, Minitube, or Firefox or Chromium Flash Video are Fullscreen and disable
# xscreensaver/kscreensaver and PowerManagement.
mplayer_detection=1
vlc_detection=1
firefox_flash_detection=1
chromium_flash_detection=1
minitube_detection=1

# Names of programs which, when running, you wish to delay the screensaver.
delay_progs=() # For example ('ardour2' 'gmpc')


# YOU SHOULD NOT NEED TO MODIFY ANYTHING BELOW THIS LINE


# enumerate all the attached screens
displays=""
while read id
do
    displays="$displays $id"
done < <(xvinfo | sed -n 's/^screen #\([0-9]\+\)$/\1/p')


# Detect screensaver been used (xscreensaver, kscreensaver or none)
screensaver=`pgrep -l xscreensaver | grep -wc xscreensaver`
if [ $screensaver -ge 1 ]; then
    screensaver=xscreensaver
else
    screensaver=`pgrep -l kscreensaver | grep -wc kscreensaver`
    if [ $screensaver -ge 1 ]; then
        screensaver=kscreensaver
    else
        screensaver=None
        echo "No screensaver detected"
    fi
fi

checkDelayProgs()
{
    for prog in "${delay_progs[@]}"; do
        if [ `pgrep -lfc "$prog"` -ge 1 ]; then
            echo "Delaying the screensaver because a program on the delay list, \"$prog\", is running..."
            delayScreensaver
            break
        fi
    done
}

checkFullscreen()
{
    # loop through every display looking for a fullscreen window
    for display in $displays
    do
        #get id of active window and clean output
        activ_win_id=`DISPLAY=:0.${display} xprop -root _NET_ACTIVE_WINDOW`
        #activ_win_id=${activ_win_id#*# } #gives error if xprop returns extra ", 0x0" (happens on some distros)
        activ_win_id=${activ_win_id:40:9}

        # Skip invalid window ids (commented as I could not reproduce a case
        # where invalid id was returned, plus if id invalid
        # isActivWinFullscreen will fail anyway.)
        #if [ "$activ_win_id" = "0x0" ]; then
        #     continue
        #fi

        # Check if Active Window (the foremost window) is in fullscreen state
        isActivWinFullscreen=`DISPLAY=:0.${display} xprop -id $activ_win_id | grep _NET_WM_STATE_FULLSCREEN`
            if ;then
                isAppRunning
                var=$?
                if ;then
                    delayScreensaver
                fi
            fi
    done
}





# check if active windows is mplayer, vlc or firefox
#TODO only window name in the variable activ_win_id, not whole line.
#Then change IFs to detect more specifically the apps "<vlc>" and if process name exist

isAppRunning()
{
    #Get title of active window
    activ_win_title=`xprop -id $activ_win_id | grep "WM_CLASS(STRING)"`   # I used WM_NAME(STRING) before, WM_CLASS more accurate.



    # Check if user want to detect Video fullscreen on Firefox, modify variable firefox_flash_detection if you dont want Firefox detection
    if [ $firefox_flash_detection == 1 ];then
        if ;then
        # Check if plugin-container process is running
            flash_process=`pgrep -l plugin-containe | grep -wc plugin-containe`
            #(why was I using this line avobe? delete if pgrep -lc works ok)
            #flash_process=`pgrep -lc plugin-containe`
            if ;then
                return 1
            fi
        fi
    fi


    # Check if user want to detect Video fullscreen on Chromium, modify variable chromium_flash_detection if you dont want Chromium detection
    if [ $chromium_flash_detection == 1 ];then
        if ;then
        # Check if Chromium/Chrome Flash process is running
            flash_process=`pgrep -lfc ".*((c|C)hrome|chromium).*flashp.*"`
            if ;then
                return 1
            fi
        fi
    fi


    #check if user want to detect mplayer fullscreen, modify variable mplayer_detection
    if [ $mplayer_detection == 1 ];then
        if ;then
            #check if mplayer is running.
            #mplayer_process=`pgrep -l mplayer | grep -wc mplayer`
            mplayer_process=`pgrep -lc mplayer`
            if [ $mplayer_process -ge 1 ]; then
                return 1
            fi
        fi
    fi


    # Check if user want to detect vlc fullscreen, modify variable vlc_detection
    if [ $vlc_detection == 1 ];then
        if ;then
            #check if vlc is running.
            #vlc_process=`pgrep -l vlc | grep -wc vlc`
            vlc_process=`pgrep -lc vlc`
            if [ $vlc_process -ge 1 ]; then
                return 1
            fi
        fi
    fi

    # Check if user want to detect minitube fullscreen, modify variable minitube_detection
    if [ $minitube_detection == 1 ];then
        if ;then
            #check if minitube is running.
            #minitube_process=`pgrep -l minitube | grep -wc minitube`
            minitube_process=`pgrep -lc minitube`
            if [ $minitube_process -ge 1 ]; then
                return 1
            fi
        fi
    fi

return 0
}


delayScreensaver()
{

    # reset inactivity time counter so screensaver is not started
    if [ "$screensaver" == "xscreensaver" ]; then
        xscreensaver-command -deactivate > /dev/null
    elif [ "$screensaver" == "kscreensaver" ]; then
        qdbus org.freedesktop.ScreenSaver /ScreenSaver SimulateUserActivity > /dev/null
    fi


    #Check if DPMS is on. If it is, deactivate and reactivate again. If it is not, do nothing.
    dpmsStatus=`xset -q | grep -ce 'DPMS is Enabled'`
    if [ $dpmsStatus == 1 ];then
            xset -dpms
            xset dpms
    fi

}



delay=$1


# If argument empty, use 50 seconds as default.
if [ -z "$1" ];then
    delay=50
fi


# If argument is not integer quit.
if ; then
    echo "The Argument \"$1\" is not valid, not an integer"
    echo "Please use the time in seconds you want the checks to repeat."
    echo "You want it to be ~10 seconds less than the time it takes your screensaver or DPMS to activate"
    exit 1
fi


while true
do
    checkDelayProgs
    checkFullscreen
    sleep $delay
done


exit 0