Tomato clock!

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#!/usr/bin/bash

# default; time in minutes
INTERVAL=40
BREAK=5
function print_help {
    echo "USAGE $0 [opts]"
    echo "options"
    echo "-i/--interval [num] duration of each work cycle, default 40"
    echo "-b/--break [num] duration of a break, default 5"
}

re='^[0-9]+$'
while [[ $# -gt 0 ]]; do
  case $1 in
    -i|--interval)
      if ! [[ $2 =~ $re ]] ; then
        echo "invalid input" >&2; print_help; exit 1
      fi
      INTERVAL="$2"
      shift # past argument
      shift # past value
      ;;
    -b|--break)
      if ! [[ $2 =~ $re ]] ; then
        echo "invalid input" >&2; print_help; exit 1
      fi
      BREAK="$2"
      shift # past argument
      shift # past value
      ;;
    -*|--*)
      print_help
      exit 1
      ;;
    *)
      POSITIONAL_ARGS+=("$1") # save positional arg
      shift # past argument
      ;;
  esac
done

let "SLEEP = $INTERVAL * 60"
let "SLEEPW = $BREAK * 60"
notify-send "timer set! next break in $INTERVAL minutes, break time $BREAK minutes  " --app-name="Tomato Timer" -i ~/utils/tomato.png

sleep $SLEEP

while true
do
    notify-send -u critical "$INTERVAL minutes elapsed, relax!  " --app-name="Tomato Timer" -i ~/utils/tomato.png
    sleep $SLEEPW
    notify-send "timer set! \n next break in $INTERVAL minutes  " --app-name="Tomato Timer" -i ~/utils/tomato.png
    sleep $SLEEP
done