#!/bin/sh
ruler="\
....+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8....+....9....+....0....+....1....+....2....+....3....+....4....+....5....+....6....+....7..."

# In case we're on SunOS4.
PATH=${PATH}:/usr/5bin
export PATH

case "$1" in
"" ) ;;
-o ) tput cuu1 ;;
 * )	echo "Use: `basename $0` [-o]";
	echo "Prints a ruler.  Use option -o to overwrite the command line."
	;;
esac

# Figure out our screensize.  This is messy because stty is different on
# every OS -- sometimes in 4 different versions!

# Old berkeley-style stty needs to access stdout, and writes to stderr.
# Modern stty accesses stdin, and writes to stdout.  Test for these.
stty -a 1>/dev/null 2>&1
case $? in
0 ) # Modern style.
    stty=`stty -a </dev/tty | grep columns`
    ;;
* ) # bsd style
    stty=`stty -a </dev/tty 2>&1 >/dev/tty | grep columns`
    ;;
esac

# OK, $stty now contains a line like one of the following:
#	..., 24 rows, 89 columns
#	...; 24 rows; 86 columns
#	...; rows 35; columns 80;...
#	rows = 24; columns = 90
#	rows = 24; columns = 80;...
#	rows = 24 columns = 80;...
#
case "$stty" in
    *[0-9]\ rows* )
	# nn rows, mm columns
	rows_cols=`echo "$stty" | sed -e \
	    's/^.* \([0-9][0-9]*\) rows.*  *\([0-9][0-9]*\) columns.*/\1 \2/'`
	;;
    *\ rows\ [0-9]* )
	# rows nn; columns mm
	rows_cols=`echo "$stty" | sed -e 's/^.* rows \([0-9][0-9]*\)[^0-9]*columns  *\([0-9][0-9]*\)[^0-9]*.*/\1 \2/'`
	;;
    * )
	# rows = mm, columns = nn
	rows_cols=`echo "$stty" | sed -e 's/^.*rows = \([0-9][0-9]*\)[^0-9].*columns =[^0-9]*\([0-9][0-9]*\)[^0-9]*.*/\1 \2/'`
	;;
esac

set -- $rows_cols
cols=$2

n=`expr $cols - 1`
expr substr "$ruler" 1 $n