The svnlook command is the workhorse of Subversion hook scripts, being used
to gather all sorts of information about a repository, its revisions, and
its transactions. This module provides a simple object oriented interface
to a specific svnlook invocation, to make it easier to hook writers to get
and use the information they need. Moreover, all the information gathered
by calling the svnlook command is cached in the object, avoiding
repetitious calls.