Re: [RFH] convert shortlog to use parse_options

Pierre Habouzit [off-list ref] writes:

The other issue is that when you had --abbrev=foo or --abbrev foo, the
first one has to generate an error, whereas the second one should just
say "foo" is not for me. The point being that the callback is not really
aware of how the argument got assigned to it.

That obviously needs to be fixed ("this is the next token that could be
yours" vs "this must be yours"), if we were to go the route I suggested.