Fabian Homborg aaaea44714 Git prompt: Only shorten sha if needed
This speeds up the common case when IO is slow, e.g. when used with
sshfs.

We only use the short sha for figuring out whether the state is
valid (for which a long sha should also work) and for display when HEAD
is detached (I think that's the correct git-ism).

Working towards #3083.
2016-05-28 17:58:29 +02:00
..