commit de239446b69f3b453050af8091e07aa5433421cc
author Jeff King <peff@peff.net> Fri Jul 07 05:16:21 2017 -0400
committer Junio C Hamano <gitster@pobox.com> Sun Jul 09 10:00:48 2017 -0700
tree 0712033a461f9d2084f6bc2eec2635ddcab6d4ef
parent d08565bf2dd78aa34c68c94f1931539c1c8c5322

reflog-walk: apply --since/--until to reflog dates

When doing a reflog walk, we use the commit's date to
do any date limiting. In earlier versions of Git, this could
lead to nonsense results, since a skipped commit would
truncate the traversal. So a sequence like:

  git commit ...
  git checkout week-old-branch
  git checkout -
  git log -g --since=1.day.ago

would stop at the week-old-branch, even though the "git
commit" entry further back is still interesting.

As of the prior commit, which uses a parent-less traversal
of the reflog, you get the whole reflog minus any commits
whose dates do not match the specified options. This is
arguably useful, as you could scan the reflogs for commits
that originated in a certain range.

But more likely a user doing a reflog walk wants to limit
based on the reflog entries themselves. You can simulate
--until with:

  git log -g @{1.day.ago}

but there's no way to ask Git to traverse only back to a
certain date. E.g.:

  # show me reflog entries from the past day
  git log -g --since=1.day.ago

This patch teaches the revision machinery to prefer the
reflog entry dates to the commit dates when doing a reflog
walk. Technically this is a change in behavior that affects
plumbing, but the previous behavior was so buggy that it's
unlikely anyone was relying on it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>