Re: Fix git-rev-parse breakage

Linus Torvalds [off-list ref] writes:

This makes "--revs-only" imply "--no-flags".

[ Side note: we might want to get rid of these confusing two-way flags, 
  where some flags say "only print xxx", and others say "don't print yyy". 
  We'd be better off with just three flags that say "print zzz", where zzz
  is one of "flags, revs, norevs" ]

I suspect that would not fly too well.

Being able to say "give me all flags meant for rev-list", "give
me all what are meant for rev-list", and "give me all non-flags
that are meant for rev-list" are very handy, so I'd rather want
to see --revs-only to mean "meant for rev-list", --no-revs to
mean "not meant for rev-list", --flags to mean "only ones that
start with a '-'", and --no-flags to mean "only ones that do not
start with a '-'".  And that would give me (rev/no-rev/lack
thereof) x (flag/no-flag/lack thereof) = 9 combinations.