Keep a X / GUI program running in background when it restarts. Check the comment for more info!

discord-keep

#!/bin/bash
# Keep a program running in background when it restart.
# I make a generalization of the script ot use with any binary, but
# initially I use it for Discord as is show here.
# Discord have a know bug of the chromium/electron platform that 
# make it go down sometimes.
# If you're using discord to coordinate with your friends a game you 
# will be doomed with this issue!.
# This script will keep discord running and minimize it when is 
# restarted to avoid any interuption of your game
# Requirementes:
# - wmctrl
# - xdotool
# On Fedora: sudo dnf install wmctrl xdotool
# On Debian: sudo apt-get install wmctrl xdotool
# To efectively close discord you will need to hit CtrL+C on the
# terminal where you run this script, closing normally discord will
# fire up the protection method of this script and will reopen Discord.
# We keep a efimeral log on /tmp/ for this.
#
# Code is not perfect, but it works. Considering that is just a quick
# 20-minutes script done so I can keep Dwarfing with Deep Rock Galactic
# is not so bad.

# You can change here Discord with any other X app.
BIN_NAME=Discord
# Name on the bin in the wmctrl -l command
WIN_NAME=${BIN_NAME}
# Binary name in the ps output
PS_BIN_NAME=${BIN_NAME}
# You can set this directly or let find the binary as is show here. 
KEEPINXBG_BIN=$(whereis -b ${BIN_NAME} | cut -d" " -f2)
# Time where the script sends the minimize command in seconds. The script
# send 1 minimize command to the windows per second.
MIN_TRY_TIME=10 


count=0
catch_it() {
    echo "Restarted ${count} times, Closing up!"
    exit 0
}

keep_in_the_back(){
    echo 'Trying to send to back'
    mini_tries=0
    # Send the minimize command multiple times as Discord opens 2 or 3 windows
    # during the startup.
    while [[ $mini_tries -lt 10 ]]; do
        # xdotool send the minimize message to the window ID we want.
        # wmctrl give us the window ID.
        # (2) Grep just the windows that we need, in this case "Discord Updater" is a
        # non-visible window that start first, that could give error if we try to minimize.
        xdotool windowminimize $(wmctrl -l | grep ${WIN_NAME} | cut -d" " -f1) &> /dev/null
        let mini_tries++
        sleep 1
    done
    echo 'Hope is in the back now!'
}

keep_running() {
echo "Keep running"
while [[ 1 ]]; do
    # Checking if is running
    sleep 2 # No need, but you can uncomment if you want to let it process
            # the core on the system if is needed. 
    pgrep Discord &> /dev/null
    if [[ $? != 0 ]];then
        let count++
        echo "Restarting ${BIN_NAME}"
        keep_in_the_back &
        $KEEPINXBG_BIN &> /tmp/discord-keep.log
    fi
done
}


trap 'catch_it' SIGINT

echo "*****************************"
echo "Remember that you need to use CTRL+C here to close ${BIN_NAME}."
echo "*****************************"
pgrep ${PS_BIN_NAME} &> /dev/null
if [[ $? == 0 ]];then
    echo " ${BIN_NAME} is started, Please close it and run this script."
    exit 1
fi
$KEEPINXBG_BIN &> /tmp/discord-keep.log
keep_running