# taken from:
# http://mercurial.selenic.com/wiki/SubversionToMercurialSync
#
# Usage: 
#        svn co http://svn.my-project.com my-project-readonly
#        svn2hg_up my-project-readonly
#        hg clone my-project-readonly my-project
#
# To update from svn
#        svn2hg_up my-project-readonly
#        cd my-project; hg pull ../my-project-readonly

#
# Updates a mercurial tree from corresponding patches in a subversion
# repository. Currently this is used to keep a read-only local mercurial
# tree in sync with the global Python repository.

# Set up...
cd $1
export LANG="C"
export LC_ALL="C"

# Make some globals for easier maintenance.
svncurrev=.svn2hg_currev
svncurlog=.svn2hg_curlog

# Set up mercurial.
test -d .hg || hg init
echo -e ".svn\n$svncurrev\n$svncurlog" > .hgignore

# Get current revisions...
new_rev=`svn up | tail -n1 | egrep -o "[0-9]+"`
test -f $svncurrev && cur_rev=`cat $svncurrev` || cur_rev=""

# Check whether we actually have a new revision at the moment...
if [ R${new_rev}R != R${cur_rev}R ]
then
    echo "Updated repository from svn: $cur_rev -> $new_rev" > $svncurlog
    if [ R${cur_rev}R = RR ]
    then
        cur_rev=$new_rev
    else
        cur_rev=`expr $cur_rev + 1`
    fi
    svn log -v -r $new_rev:$cur_rev >> $svncurlog
    echo $new_rev > $svncurrev
    hg commit -A -l $svncurlog > /dev/null 2>&1
fi