[PATCH 0/3] shortlog: do not accept revisions when run outside repo

Patch 3 stops git shortlog from BUG-ing when it's being used slightly wrong. Patches 1 and 2 are recursive preparation. Based on maint.

Someone trying this out might notice that `man git-shortlog` renders "\--" as "\--", which is not wanted. (Also visible on git-scm.com...) There is quite some history around such double-slashes and compatibility with AsciiDoc-versions, so I'd rather not do a "while at it" there. Regardless of the destiny of patch 1/3, I will follow up later to address various forms of "\--" throughout the tree.

Martin Ågren (3):
  git-shortlog.txt: reorder usages
  shortlog: add usage-string for stdin-reading
  shortlog: do not accept revisions when run outside repo

 Documentation/git-shortlog.txt | 2 +-
 t/t4201-shortlog.sh            | 5 +++++
 builtin/shortlog.c             | 9 ++++++++-
 3 files changed, 14 insertions(+), 2 deletions(-)