nix/modules/home-manager/scripts/common/bin/countdown

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#!/usr/bin/env bash
function usage {
echo "countdown - exit after a certain amount of time has passed"
echo " Usage:"
echo " countdown <SECONDS> && command..."
echo
echo " Examples:"
echo ' countdown 120 && echo "Two minutes has elapsed!"'
}
[[ $# -lt 1 ]] && { printf "error: no SECONDS argument provided\n" >&2; usage; exit 1; }
d=$(($(date +%s) + $1));
printf 'Started at %s\n' "$(date)"
while [[ "$d" -ge "$(date +%s)" ]]; do
_dt=$((d - $(date +%s)))
days=$((_dt / 86400))
printf "\r%sd %s " "$days" "$(date -u --date @$((_dt)) +%H:%M:%S)";
sleep 0.1
done
printf "\rCountdown finished %s\n" "$(date)"