SVNRevision revision = SVNRevision.HEAD;
SVNLookClient lookClient = getClientManager().getLookClient();
if (getCommandLine().hasArgument(SVNArgument.TRANSACTION)) {
String transactionName = (String) getCommandLine().getArgumentValue(SVNArgument.TRANSACTION);
String author = lookClient.doGetAuthor(reposRoot, transactionName);
SVNCommand.println(out, author != null ? author : "");
return;
} else if (getCommandLine().hasArgument(SVNArgument.REVISION)) {
revision = SVNRevision.parse((String) getCommandLine().getArgumentValue(SVNArgument.REVISION));
}