Stream prompt was to make a pomodoro utility in pure bash and I needed a break from some JS insanity earlier today. I'll probably colorize it later and do some other fancy stuff at some point.

basic_pomodoro.sh

#!/usr/bin/bash

declare mins count colstart fmtmin fmtsec outp

mins="$1"

if [[ -z "$mins" ]]; then
  printf 'Need a minute value.\n'
  exit 1
fi

(( count=mins*60 ))

while (( count > 0 )); do
  sleep 1

  (( count-=1 ))
  (( fmtmin=count / 60 ))
  (( fmtsec=count % 60 ))

  printf -v outp '%02dm%02ds' "$fmtmin" "$fmtsec"

  (( colstart=$(tput cols) - ${#outp} ))

  tput sc
  tput cup 0 $colstart
  printf '%s' "$outp"
  tput rc

done

tput sc
tput cup 0 $(( $(tput cols) - 10 ))
printf '          '
tput rc