shelve: allow --patch and --stat without --list for a single shelf It's annoying having to specify --list and --patch/--stat when all you really want to do is to dump a patch. This creates an explicit --patch/--stat command that is executed if --list is not specified. It ensures that 1) there is only one shelf name specified and 2) that the shelf exists. Then it redirects to the original listcmd code.

% creating repo
% add and commit
C test.py
% change
M test.py