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#! /bin/bash
# Ref: https://superuser.com/questions/611538/611582#611582
SIGNAL=${1:-SIGTERM}
# If SIGNAL is received, switch to next display
trap 'next_display' $SIGNAL
#trap 'toggle_timer' SIGTSTP
# Do not print "^C" when SIGINT caught
stty -ctlecho
# Hide the cursor
tput civis
display_list=(STOPWATCH COUNTDOWN PERIOD)
export DISPLAY=0
next_display() {
export DISPLAY=$(( ($DISPLAY + 1) %${#display_list[@]} ))
}
export stop=
toggle_timer() {
[ "$stop" = true ] && export stop= || export stop=true
}
# Wait user input
read -p '? ' input
# Modify input to fit the format that `date` can read
# s -> sec
# m -> min
# h -> hour
[[ "$input" =~ s && ! "$input" =~ sec ]] && input="$(sed s/s/sec/ <<<"$input")"
[[ "$input" =~ m && ! "$input" =~ min ]] && input="$(sed s/m/min/ <<<"$input")"
[[ "$input" =~ h && ! "$input" =~ hour ]] && input="$(sed s/h/hour/ <<<"$input")"
start=$(date +%s) # unix epoch of start
given=$(date +%s -d "$input") # unix epoch of end
period=$(( $given - $start )) # seconds for timer
time=0
while [ $time -ne $period ]; do
[ "$stop" = true ] && sleep 0.3 && continue
time="$(( $(date +%s) - $start ))"
case ${display_list[$DISPLAY]} in
STOPWATCH)
printf '%s\r' "$(date -u -d @$time +%H:%M:%S)"
;;
COUNTDOWN)
printf '%s\r' "$(date -u -d @$((period - $time)) +%H:%M:%S)"
;;
PERIOD)
printf '%s\r' "$(date -u -d @$period +%H:%M:%S)"
;;
esac
sleep 0.3
done
printf "\e[1;31m$(date -u -d "@$time" +%H:%M:%S)"
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