#!/bin/sh

# cvsdiff deposits the results of running `cvs diff' in a file cvsdiff-<N+1>
# where <N> is the current latest cvsdiff file number (e.g. if the latest
# cvsdiff file is cvsdiff-3 then the new one will be cvsdiff-4.)
#
# The results of running `interdiff cvsdiff-<N> cvsdiff-<N+1>' are deposited
# in a file interdiff-<N>-<N+1> (e.g. to follow the example above, the
# interdiff file would be interdiff-3-4.)

set -x

lastcvsdiff=`ls -rt cvsdiff-* 2> /dev/null | tail -1`
M=`echo $lastcvsdiff | sed 's/cvsdiff-//'`
N=`expr 0$M + 1`
newcvsdiff="cvsdiff-$N"

cvs -n diff > $newcvsdiff

newinterdiff="interdiff-$M-$N"

if [ -z "$lastcvsdiff" ]
then
	cp $newcvsdiff $newinterdiff
else
	interdiff $lastcvsdiff $newcvsdiff > $newinterdiff
fi