[PATCH 0/4] handling empty inputs in the revision machinery

I noticed that:

  git log --tags=does-not-exist

will show all of HEAD, which is rather confusing. This fixes it, and also hits several other cases that were marked as expect_failure for rev-list. There is one case it doesn't handle: --stdin. It's not clear to me what the right behavior is there. I'll follow up with more discussion.

  [1/4]: t6018: flesh out empty input/output rev-list tests
  [2/4]: revision: add rev_input_given flag
  [3/4]: rev-list: don't show usage when we see empty ref patterns
  [4/4]: revision: do not fallback to default when rev_input_given is set

 builtin/rev-list.c       |  3 ++-
 revision.c               |  3 ++-
 revision.h               |  7 +++++++
 t/t4202-log.sh           |  6 ++++++
 t/t6018-rev-list-glob.sh | 20 +++++++++-----------
 5 files changed, 26 insertions(+), 13 deletions(-)

-Peff