#!/bin/ksh
# $Id: oncall.sh,v 1.2 1997/11/23 22:55:27 ksb Exp $
#
# Determin who's pager gets beeped (who is on call?) output the line of
# the person whose week it is.						(wam)
# The input file data file has lines like
#	# comments
#	who	pager-pin
#	whoelse	pager-pin
# we round-robin through the list unless one is prefixed with the
# string "ONCALL:" (in which case we always pick them).

PATH=/usr/bin:$PATH
FILE=${1:-/usr/local/lib/oncall}
WEEK=${2:-`date +"%W"`}
# $1 is the data file to scan for oncall lines
# $2 forces the week number if the caller wants to ask who is on-call
# for that week (like next week).

# Trap a forced oncall person first (viz. ONCALL: person pager).
if PERSON=`grep '^ONCALL:' $FILE`
then
	set _ $PERSON
	shift
	shift
	echo $@
	exit 0
fi

# else just cycle through them by week
NUM=`egrep -v '^#|^[ 	]*$' $FILE | wc -l`
egrep -v '^#|^[	 ]*$' $FILE | sed -n -e `expr 1 + \( $WEEK % $NUM \)`p

exit 0