#!/bin/sh
# cvdr - show the most recent changes to a file stored with CVS
#
# Starting from the most recent version of the currently checked out
# branch, cvdr will display the log message and diff of each change made
# to the file, down to the initial version.  Each file on the command
# line is processed in turn.
#
# Originally written by Fergus Henderson <fjh@cs.mu.oz.au>
# Hacked to support branches by Tyson Dowd <trd@cs.mu.oz.au>
#
# Known bugs: doesn't handle the case where the initial version is on a
# branch -- in other words this script assumes the initial version is 1.1
# Fixing this is a bit tricky.

options=
while true; do
	case "$1" in
		-*)	options="$options $1"
			shift
			;;
		*)	break
			;;
	esac
done

for file in "$@"; do
{
topversion="`cvs -n status $file 2>/dev/null | awk '
	/  Repository revision:/ 		{ print $3; exit; }	
'`"

branch=`expr match $topversion '\(\([0-9]*\.\)*[0-9]*\)\.[0-9]*'`
N=`expr match $topversion "$branch\.\([0-9]*\)"` 

echo "Revision $branch.$N"

while [ "$branch" != "" ]; do
	while [ $N -gt 1 ]; do
		N1=`expr $N - 1`
		echo cvs log -r$branch.$N $options "$file"
		cvs -n log -N -r$branch.$N $options "$file" | sed '1,/^-------/d'
		echo cvs diff -u -r$branch.$N1 -r$branch.$N $options "$file"
		cvs -n diff -u -r$branch.$N1 -r$branch.$N $options "$file"
		N=$N1
		echo "Revision $branch.$N"
	done 
	newbranch=`expr match $branch '\(\([0-9]*\.\)*[0-9]*\)\.[0-9]*\.[0-9]*'`
	N1=`expr match $branch "$newbranch\.\([0-9]*\)"` 
	if [ "$newbranch" != "" ]; then
		echo cvs log -r$branch.$N $options "$file"
		cvs -n log -N -r$branch.$N $options "$file" | sed '1,/^-------/d'
		echo cvs diff -u -r$newbranch.$N1 -r$branch.$N $options "$file"
		cvs -n diff -u -r$newbranch.$N1 -r$branch.$N $options "$file"
		echo "Revision $newbranch.$N1"
	fi
	branch=$newbranch
	N=$N1
done

	# We only use CVSROOT to remove it as a prefix to the path in
	# CVS/Repository.  Most recent versions of CVS/Repository
	# don't include the repository anyway, and so if it isn't set we
	# ignore it.
if [ "$CVSROOT" == "" ] ; then
	FULLFILE=`cat CVS/Repository`/$file
else
	FULLFILE=`sed "s^$CVSROOT/^^" CVS/Repository`/"$file"
fi

echo cvs log -r1.1 $options "$file"
cvs -n log -N -r1.1 $options "$file" | sed '1,/^-------/d'
echo cvs checkout -p -r1.1 "$FULLFILE"
cvs -n checkout -p -r1.1 "$FULLFILE" 2>&1
} | ${PAGER:-more}
done