my $branch = $c->request->params->{branch} ;

    my $branch;
    die("invalid revisions: [$rev1] [$rev2]") if $rev1 !~ m/^[a-zA-Z0-9_.]+$/ || $rev2 !~ m/^[a-zA-Z0-9_.]+$/ ;

	$diff .= `(cd $clonePath ; hg log -r $rev1 -r $rev2)`;

        $branch = `hg log --template '{branch}' -r $rev2`;
	$diff .= `(cd $clonePath ; hg log -r $rev1 -r $rev2 -b $branch)`;