#! /bin/sh
# #############################################################################

       NAME_="xbreak"
       HTML_="display break X window message"
    PURPOSE_="display an X window message when it's time to take a break"
   SYNOPSIS_="$NAME_ [-hl] <n>"
   REQUIRES_="standard GNU commands"
    VERSION_="1.0"
       DATE_="2004-06-23; last update: 2004-07-01"
     AUTHOR_="Dawid Michalczyk <dm@eonworks.com>"
        URL_="www.comp.eonworks.com"
   CATEGORY_="desk"
   PLATFORM_="Linux"
      SHELL_="bash"
 DISTRIBUTE_="yes"

# #############################################################################
# This program is distributed under the terms of the GNU General Public License

usage () {

echo >&2 "$NAME_ $VERSION_ - $PURPOSE_
Usage: $SYNOPSIS_
Requires: $REQUIRES_
Options:
     <n>, an integer in minutes; for every n minutes a break message is displayed
     -h, usage and options (this help)
     -l, see this script"
    exit 1
}

# enabling extended globbing
shopt -s extglob 

# option handling
case $1 in
    -h) usage ;;
    -l) more $0; exit 1 ;;
    +([0-9])) # arg1 can only be an integer

        while :;do

            sleep ${1}m
            # display windowed message if x is running
            ps -aux | grep -q xinit
            [ $? = 0 ] && xmessage -center Time for a break!

        done ;;

    *) echo invalid argument, type $NAME_ -h for help; exit 1 ;;

esac