provide pre- and post- hooks with parsed command line arguments. python hooks are passed two new keyword arguments: - opts: a dict of options; unsepcified options are set to their default - pats: a list of arguments shell hooks receive two new variables containing string representations of the above data: - $HG_OPTS - $HG_PATS for example, the opts and pats for 'hg -f v1.1' would be: {'force': True, 'message': '', 'rev': '', 'user': '', 'date': '', 'local': None, 'remove': None, 'mq': None} ['v1.1']