#!/bin/sh

# Notification daemon that clears notification text after a given time

. "lib_handle.sh"

FIFO=/tmp/noti.fifo
FILE=/tmp/noti.txt

[ -p "${FIFO}" ] || mkfifo "${FIFO}"

exec 3<"${FIFO}"
exec 4>"${FIFO}"

tpid=""

cancel() {
    [ -n "${tpid}" ] && kill "${tpid}" 2>/dev/null
    tpid=""
}

while read -r n <&3; do
    [ "${n}" = "-1" ] && { cancel; continue; }

    case "${n}" in ''|*[!0-9]*) continue ;; esac

    cancel

    [ "${n}" -gt 0 ] || { :>"${FILE}"; notify_handle reload; continue; }

    (
        sleep "${n}"
        :>"${FILE}"
        notify_handle reload
    ) &
    tpid=$!
done