#!/bin/bash
#
# $Id: rvi,v 1.2 2002/08/13 04:40:42 kevino Exp $
#
# Copyright 2002 Kevin O'Donnell
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

declare -i RECURSE=0

find_sym_source() {
	RECURSE=$RECURSE+1

	echo starting with $FILE

	DIRNAME=`dirname $FILE`
	BASENAME=`basename $FILE`
	cd $DIRNAME

	if [ -h $BASENAME ]; then
		echo $BASENAME is a sym

		if [ $RECURSE == 10 ]; then
			echo 10 deep
			exit
		fi

	 	FILE=`ls -lF $BASENAME | awk ' BEGIN { FS = " " } { print $11 } '`
		echo now using $FILE
		find_sym_source;
	fi
}

# set an editor if there isn't one already
if [ -n "$EDITOR" ]; then
	EDITOR=`which vi`
fi

# find ci
CI=`which ci`
if [ ! -n "$CI" ]; then
	echo "ERROR: could not find 'ci'; check $PATH"
	exit 1
fi

# fine rcs
RCS=`which rcs`
if [ ! -n "$RCS" ]; then
	echo "ERROR: could not find 'rcs'; check $PATH"
	exit 1
fi

# remember the current directory
PWD=`pwd`

# set FILE to the file we want to edit
FILE=$1

# follow symlinks if necessary
find_sym_source;

# check the RCS directory
if [ ! -e RCS ]; then
	# nothing by the name of RCS exists
	mkdir RCS
	if [ $? -ne 0 ]; then
		echo "ERROR: failed to make RCS directory"
		exit 1
	fi
	chmod g+w RCS
	if [ $? -ne 0 ]; then
		echo "ERROR: failed to make RCS directory group writable"
	fi
else
	# something by the name of RCS exists
	if [ ! -d RCS ]; then
		# RCS is not a directory
		echo "ERROR: $DIRNAME/RCS exists but is not a directory"
		exit 1
	else
		# good, it is a directory
		if [ ! -w RCS ]; then
			# it's not writable
			chmod u+w RCS
			if [ $? -ne 0 ]; then
				echo "ERROR: failed to make RCS directory user writable"
				exit 1
			fi
			chmod g+w RCS
			if [ $? -ne 0 ]; then
				echo "ERROR: failed to make RCS directory group writable"
				exit 1
			fi
		fi

		if [ ! -x RCS ]; then
			# it's not executable
			chmod u+x RCS
			if [ $? -ne 0 ]; then
				echo "ERROR: failed to make RCS directory user executable"
				exit 1
			fi
			chmod g+x RCS
			if [ $? -ne 0 ]; then
				echo "ERROR: failed to make RCS directory group executable"
				exit 1
			fi
		fi
	fi
fi

# check RCS status of file
if [ ! -e $BASENAME ]; then
	# editing a new file, create an empty version
	touch $BASENAME
	# since the basename doesn't exist, remove any entries in the RCS tree
	if [ -e "RCS/$BASENAME,v" ]; then
		DATE=`date "+%Y-%m-%d-%H-%M-%S"`
		mv "RCS/$BASENAME,v" "RCS/$BASENAME-$DATE,v"
	fi
fi

if [ ! -e "RCS/$BASENAME,v" ]; then
	# no RCS log exists, to initial checkint
	echo ""
	echo "Entering $BASENAME into RCS repository"
	echo ""
	echo "" | ci -u $BASENAME
	rcs -U $BASENAME
	chmod u+w $BASENAME
	chmod g+w $BASENAME
fi

# edit the file
$EDITOR $BASENAME

# check in any changes
ci -u $BASENAME
chmod u+w $BASENAME
chmod g+w $BASENAME

# finished, return to old directory
cd $PWD