Cheap pomodoro timer

pomodoro.sh

#!/bin/bash

# Cheap pomodoro timer
# https://en.wikipedia.org/wiki/Pomodoro_Technique

set -eu

trap bye INT TERM

bye() {
    echo -e "\nThe tomato has been squashed."
}

say() {
    command -v espeak >/dev/null && espeak -a 200 "$@"
}

output() {
    echo "[$(date +%R)] $@"
}

echo "Hey you! I'm a tomato, listen to me!"

i=0
while true; do
    echo
    output "Decide on the task to be done then work on the task until the timer rings (25 minutes)."
    say "Work"

    i=$((i + 1))
    sleep 1500

    if [ $((i % 4)) -eq 0 ]; then
        output "Take a long break (20 minutes)."
        say "Long break"
        sleep 1200
    else
        output "Take a short break (5 minutes)."
        say "Short break"
        sleep 300
    fi
done