countdown

#!/bin/sh

# A countdown timer
# Joe Standring <git@joestandring.com>
# GNU GPLv3

# Pausing notifications
# dunstctl set-paused true
# kill -48 $(pidof dwmblocks)

# Signal 3 + 34 = 37 triggers dwm_countdown block in dwmblocks
SIGNAL=37

# Check for an existing instance
for _f in /tmp/countdown.*; do
    if [ -e "$_f" ]; then
        printf "There may be another instance of this script running. If you are sure there is not, delete the file %s and try again.\n" "$_f"
        exit 1
    fi
    break
done

TMP=$(mktemp /tmp/countdown.XXXXX)
trap 'rm -f "$TMP"; kill -$SIGNAL $(pidof dwmblocks) 2>/dev/null; trap - EXIT; exit' EXIT INT HUP

# If there are 3 arguments given, they become H, M, and S. Otherwise, the user is asked
if [ $# -eq 3 ]; then
    HOU=$1
    MIN=$2
    SEC=$3
else
    read -r -p 'Hours: ' HOU
    read -r -p 'Minutes: ' MIN
    read -r -p 'Seconds: ' SEC
fi

TIMER=$(( (HOU*3600) + (MIN*60) + SEC ))

while [ $TIMER -gt 0 ]; do
    printf "%02dh:%02dm:%02ds\n" $((TIMER/3600)) $((TIMER%3600/60)) $((TIMER%60))
    # Overwrite (not append) — file stays 1 line
    printf "%02d:%02d:%02d\n" $((TIMER/3600)) $((TIMER%3600/60)) $((TIMER%60)) > "$TMP"
    # Signal dwmblocks to refresh the countdown block
    kill -$SIGNAL $(pidof dwmblocks) 2>/dev/null
    sleep 1
    TIMER=$(( TIMER - 1 ))
done

# Timer finished — trap will clean up TMP and signal dwmblocks
dunstctl set-paused false
kill -48 $(pidof dwmblocks) 2>/dev/null
printf "Timer Finished" | dmenu -sb "red" -sf "black"
notify-send "Timer Finished!"
# mpv ~/scripts/alarm.ogg