Get a popup window as a timer using zenity

Timer.sh

#!/bin/bash
# (C) 2014 Roland Latour, gpl v2
# from http://user.cavenet.com/rolandl
# uses zenity to create/move popup window as a timer

###################################################################
# modified by Samuele Rini 
#
# https://github.com/dentex/
# https://dentex.github.io/
#
# original source at http://user.cavenet.com/rolandl/timer.txt
###################################################################


#
#Config-no-term
#


IMAGE_FILE="/home/samuele/.face"
AUDIO_FILE="/usr/share/sounds/linuxmint-gdm.wav"

function parse_time () {
  m=0
  s=0

  if [[ $1 = *":"* ]]; then
    m=`echo $1 | cut -d ':' -f1`
    s=`echo $1 | cut -d ':' -f2`
    
    LIMIT=$(( $m*60+$s ))
  else
    LIMIT=$1
  fi
}

LABEL=`zenity --entry --text="Enter the timer's LABEL string" 2>/dev/null`
time=`zenity --entry --text="Enter timer's countdown time;\nFormat 'MM:SS'\nor\n'SS' only (i.e. 90)" 2>/dev/null`

parse_time $time

# load wmctrl into memory so it's there when requested later
wmctrl -l 2> /dev/null  > /dev/null

function blink_status_bar () {
(for ((i=1; i<8; i++));do
  sleep .1;echo 0;sleep .1;echo 100
done) }

# if there is a LIMIT entry, use it, else assume 3 minutes
if test -z "$LIMIT"; then
  LIMIT=180
  LABEL="Tea_Timer"
else
# force mathematical evaluation, for syntax: timer minutes*60
  let LIMIT=($LIMIT * 1)
# eliminates error message: "integer expression expected"
# getting strange results with leading zeros
  let min=($LIMIT / 60)
fi

# if there is a LABEL entry, use it as LABEL
if test -z "$LABEL"; then
  true
else
  LABEL=`echo $LABEL|sed 's/ /_/g'`
fi

# ======= Start timing ==========
# parens cause work to be done in a subshell, then piped to zenity
(

# relocate zenity to 1st workspace
sleep .2;wmctrl -r $LABEL -t 0
# If command is run from cmdline, can't 'Move to Another Workspace'-dunno why.
# Or control properties like OnTop, Visible, or Below
# tried 'wmctrl -r $LABEL -b remove,sticky' with no effect
# This problem does not occur when run via F-key. Very strange!
# Worse: can use above syntax to move zenity to another desktop, as shown
# in 'Workspace Switcher', but zenity does not appear on that actual desktop!
# Instead, it re-appears on 2nd desktop as soon as I switch back to it.

# the above problem does not apply if I run, say 'xmag', from the cmdline!

# relocate zenity to upper left corner
if [ $LIMIT -lt 3600 ]; then
   wmctrl -r $LABEL -e 0,30,20,-1,-1
else
   wmctrl -r $LABEL -e 0,280,20,-1,-1
fi


for ((a=$LIMIT; a > 0; a--)); do
# compute Hrs/Mins/Secs
  let hour=($a / 3600)
  let y=($hour * 60)
  let min=($a / 60)
  let min=($min - $y)
  let y=($y * 60)
  let z=($min * 60)
  let sec=($a - $y - $z)

  if [ $hour -gt 0 ]; then
# pad min and sec, ex: "9" to "09", "0" to "00"
     echo "# Time Left:   $hour:`printf "%02.f" $min`:`printf "%02.f" $sec`"
  else
# pad sec, ex: "9" to "09", "0" to "00"
     echo "# Time Left:   $min:`printf "%02.f" $sec`"
   fi

# compute percentage of limit time, update progress bar
  let y=($LIMIT - $a)
  let y=($y * 100)
  let pct=($y / $LIMIT)
  echo $pct;sleep 0.99
# slow by 7 seconds in 3 hours
done

echo 100;echo "# $LABEL completed"

# move zenity to current workspace, always-on-top
wmctrl -R $LABEL;wmctrl -r $LABEL -b add,above

# Notifications
aplay $AUDIO_FILE
xcowsay -t 5 --at=1950,20 --image="$IMAGE_FILE" "$LABEL completed" &
blink_status_bar

) | zenity --progress --title=$LABEL --percentage=0 --auto-kill 2>/dev/null