gedit lock-screen-timer

#!/bin/bash

# NAME: lock-screen-timer
# PATH: $HOME/bin
# DESC: Lock screen in x minutes
# CALL: Place on Desktop or call from Terminal with "lock-screen-timer 99"
# DATE: Created Nov 19, 2016. Last revision Nov 13, 2021.

# UPDT: Updated to support WSL (Windows Subsystem for Linux)
#       Remove hotplugtv. Replace ogg with paplay.
#       May 30 2018 - Cohesion with multi-timer. New sysmonitor indicator style.
#       Nov 13 2021 - Wrap long lines with \ continuation. Shorten comments.

# NOTE: Time defaults to 30 minutes.
#       If previous version is sleeping it is killed.
#       Zenity is used to pop up entry box to get number of minutes.
#       If zenity is closed with X or Cancel, no screen lock timer is launched.
#       Pending lock warning displayed at set intervals.
#       Write time remaining to ~/.lock-screen-timer-remaining

MINUTES="$1" # Optional parameter 1 when invoked from terminal.

# if no parameters set default MINUTES to 30
if [ $# == 0 ]; then
    MINUTES=30
fi

DEFAULT="$MINUTES" # When looping, minutes count down to zero. 
                   # Save deafult for subsequent timers.

# Check if lock screen timer already running
pID=$(pgrep -f "${0##*/}") # All PIDs matching lock-screen-timer name
PREVIOUS=$(echo "$pID" | grep -v ^"$$") # Strip out this running copy ($$$)
if [ "$PREVIOUS" != "" ]; then
    kill "$PREVIOUS"
    rm ~/.lock-screen-timer-remaining
    zenity --info --title="Lock screen timer already running" \
        --text="Previous lock screen timer has been terminated."
fi

# Running under WSL (Windows Subsystem for Linux)?
if cat /proc/version | grep Microsoft; then
    WSL_running=true
else
    WSL_running=false
fi


while true ; do # loop until cancel

    # Get number of minutes until lock from user
    MINUTES=$(zenity --entry --title="Lock screen timer" \
        --text="Set number of minutes until lock" --entry-text="$DEFAULT")

    RESULT=$? # Zenity return code
    if [ $RESULT != 0 ]; then
        break ; # break out of timer lock screen loop and end this script.
    fi

    DEFAULT="$MINUTES" # Save deafult for subsequent timers.
    if [[ $MINUTES == 0 ]] || [[ $MINUTES == "" ]]; then
        break ; # zero minutes considered cancel.
    fi

    # Loop for X minutes, testing each minute for alert message.
    (( ++MINUTES )) 
    while (( --MINUTES > 0 )); do
        case $MINUTES in 1|2|3|5|10|15|30|45|60|120|480|960|1920)
	        notify-send --urgency=critical \
	        --icon=/usr/share/icons/gnome/256x256/status/appointment-soon.png \
	        "Locking screen in ""$MINUTES"" minute(s)." ;
            if [[ $WSL_running == true ]]; then  
                powershell.exe -c '(New-Object Media.SoundPlayer \
                "C:\Windows\Media\notify.wav").PlaySync();'
            else
	           paplay /usr/share/sounds/freedesktop/stereo/complete.oga ;
            fi
	       ;;
        esac;

        # Record number of minutes remaining to file other processes can read.
        echo "Lock screen in: $MINUTES Minutes" > ~/.lock-screen-timer-remaining

        sleep 60

    done

    rm ~/.lock-screen-timer-remaining # Remove countdown work file

    if [[ $WSL_running == true ]]; then  
        # Call lock screen for Windows 10
        rundll32.exe user32.dll,LockWorkStation
    else
        # Call screen saver lock for Unbuntu versions > 14.04.
        dbus-send --type=method_call --dest=org.gnome.ScreenSaver \
            /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock
    fi

done # End of while loop getting minutes to next lock screen

exit 0 # Closed dialog box or "Cancel" selected.

chmod +x lock-screen-timer

~/lock-screen-timer