#!/bin/sh

# ce -- center text

usage() { echo usage: $0 [cols] 1>&2; exit 1; }

[ $# -gt 1 ] && usage

if [ $# -eq 1 ]; then
	cols=${1#-}
	[ "$cols" -gt 0 ] || usage
	shift
else
	cols=`tput cols`
	[ "$cols" -le 80 ] || cols=80
fi

while read line; do
	line=${line## }
	line=${line%% }
	len=`echo "$line" | wc -c`
	max=$(((cols - len) / 2))
	i=0
	while [ $((i++)) -lt $max ]; do
		printf ' '
	done
	echo "$line"
done