#!/bin/sh

################################################################################
# LICENSE
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# Copyright 2008 John Hobbs
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# 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.
################################################################################

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# ABOUT
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#
# Home: http://www.velvetcache.org/
#
# This is a script to cross load subversion repositories (kind of) keeping history
# intact without access to svnadmin.  Import into a FRESH repository only, and
# be sure to do a comprehensive diff at the end.
#
# Also be sure to do this in an empty directory. Temp files get added and removed
# without sincere thought put into them.
#
# Log messages get eaten and re-inserted as shown below. Edit to taste.
#   $ svn log -r 1
#   ------------------------------------------------------------------------
#   r1 | jmhobbs | 2008-11-12 18:19:43 -0600 (Wed, 12 Nov 2008) | 7 lines
#
#   Imported from file:///srv/svn/scs using svncrossload
#
#     |r1 | jmhobbs | 2008-10-27 17:32:44 -0500 (Mon, 27 Oct 2008) | 2 lines
#     |
#     |Initial import.
#     |
#
#   ------------------------------------------------------------------------
#   $

echo "Checking out initial revisions"
svn co $2 importing > /dev/null
svn co -r 0 $1 updateme > /dev/null

echo "Getting most recent revision number"
LATESTREVISION=$(svn info $1 | grep Revision | sed 's/^Revision: *\([0-9]*\)/\1/')

for i in $(seq 1 $LATESTREVISION); do

	echo -e "\nCopying revision $i"

	cd updateme
	svn update -r $i > ../_update
	echo -e "Imported from $1 using svncrossload\n" > ../_log
	# The '\-\-\-\-\...' looks ridiculous, but it works.
	svn log -r $i | grep -v '\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-' | sed 's/\(.*\)/   |\1/'  >> ../_log
	cd ..

	cat _update | grep -E '^A' | sed 's/^A *//' > _update_add
	cat _update | grep -E '^D' | sed 's/^D *//' > _update_del
	cat _update | grep -E '^U' | sed 's/^U *//' > _update_mod

	echo "$(wc -l _update_add | sed 's/^\([0-9]*\).*/\1/') Files To Add"
	echo "$(wc -l _update_mod | sed 's/^\([0-9]*\).*/\1/') Files To Modify"
	echo "$(wc -l _update_del | sed 's/^\([0-9]*\).*/\1/') Files To Delete"

	# Copy
	for j in $(cat _update_add | tr ' ' '@'); do
		if [ -d "updateme/${j//@/ }" ]; then
			mkdir "importing/${j//@/ }"
		else
			cp -f "updateme/${j//@/ }" "importing/${j//@/ }"
		fi
		cd importing
		# We send cerr to null because it warns when we add existing stuff
		svn add "${j//@/ }" 2> /dev/null
		cd ..
	done

	# Modify
	for j in $(cat _update_mod | tr ' ' '@'); do
		if [ -f "updateme/${j//@/ }" ]; then
			cp -f "updateme/${j//@/ }" "importing/${j//@/ }"
		fi
	done

	# Delete
	for j in $(cat _update_del | tr ' ' '@'); do
		cd importing
		svn rm "${j//@/ }"
		cd ..
	done

	echo "Committing"
	cd importing
	svn commit -F ../_log
	cd ..

done

echo "Cleaning up"
rm -rf importing _log _update _update_add _update_del updateme _update_mod
echo "Done!"