tell

#!/bin/sh
CMD_NAME=`basename $0`
usage_exit() {
    cat <<- HELPEND
	$CMD_NAME wait_time[hms] [-c command | message]
	    wait_time   wait time[unit]
	        [unit]
	           h:   hours = wait_seconds * 3600 [sec]
	           m:   minutes = wait_seconds * 60 [sec]
	           s:   seconds = wait_seconds [sec] (default)

	    -c command  execute command after wait_time
	                default) tmux new window & popup message

	    message     any message
HELPEND
    exit 1
}

# set wait seconds
if [ ${#1} -ge 2 ]; then
    target_time=`echo "$1" | cut -c 1-\`expr ${#1} - 1\``
fi
case "$1" in
    *h ) wait_sec=`expr $target_time \* 3600`
        ;;
    *m ) wait_sec=`expr $target_time \* 60`
        ;;
    *s ) wait_sec="$target_time"
        ;;
    *  ) wait_sec="$1"
        ;;
esac

# wait_sec is digit?
if [ -z "`echo "$wait_sec" | grep '^[0-9]\{1,\}$'`" ]; then
    echo "Invalid wait time!: `$1`"
    usage_exit
fi

# set execute command
case $2 in
    -c ) exec_command=$3
        ;;
    "" ) exec_command="popup_window"
        ;;
    *  ) exec_command="popup_window '$2'"
        ;;
esac
popup_window() {
    [ -n "$*" ] && msg="$*" || msg="take a break!"
    [ -n "`which bunnysay`" ] && print_cmd=bunnysay || print_cmd=echo

    # make popup window
    tmux new-window 2> /dev/null && (
        WIN_ID=`tmux display -p '#I'`

        # print message
        tmux pipe-pane -I -t:$WIN_ID 'echo " "'
        tmux pipe-pane -I -t:$WIN_ID "echo '$print_cmd \"$msg\"'"
        # tmux clock-mode -t:$WIN_ID 2> /dev/null

        # auto close
        sleep 3
        tmux kill-window -t:$WIN_ID
    ) 2> /dev/null \
    || ( echo " "; $print_cmd "$msg" ) 1>&2
}

# wait & excuete command
sleep $wait_sec && $exec_command &