Martin von Zweigbergk <martinvonz@google.com> [Fri, 15 Sep 2017 00:01:57 -0700] rev 34250
templater: extract shortest() logic from template function
It can be useful for extensions to be able to produce the shortest
unambiguous hash (including the in-tree "show" extension). That logic
is currently inside the shortest() template function. Let's move it
out of the templater. I've put it on revlog since it's closely related
to revlog._partialmatch. We may also want a convenience method on
context, but I'll leave that for a later patch.
Differential Revision: https://phab.mercurial-scm.org/D724