Re: [PATCH] revisions: refactor handle_revision_opt into parse_revision_opt.

Jeff King [off-list ref] writes:

but it also seems like the top bit of that for loop is boilerplate, too:

quoted

 	for (;;) {
 		switch (parse_options_step(&ctx, options, shortlog_usage)) {
 		case PARSE_OPT_HELP:
 			exit(129);
 		case PARSE_OPT_DONE:
 			goto parse_done;
 		}

Another thing we should be able to refactor is the option help formatter.
Cf. 071438a (Teach git-merge -X<option> again., 2008-07-09)