From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ramkumar Ramachandra <artagnon@gmail.com>
Subject: Re: [git-users] Highlevel (but simple to implement) commands provided
 by default for git
Date: Thu, 30 May 2013 02:56:20 +0530
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To: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano wrote:
> The whole point of show-cdup is that people (especially those in
> java land) bury themselves in a hierarchy so deep that it is not
> feasible to tell "Go count the hierarchy and prefix that many ../
> yourself" to them.

Ah.

> The answer to "we cannot count ../" issue is ":(top)" aka ":/" magic
> pathspec modifier.

I thought :/ was a revspec, which is why I was scratching my head so
hard.  Did we introduce this ambiguity intentionally?

This errors out:

  git log :/Makefile

So, I have to do either of these:

  git log :/Makefile --
  git log -- :/Makefile

depending on what I want.

> "git blame" takes a single pathname, not "a set of patterns to match
> against to select concrete paths", which is what a pathspec is.

So the problem is that I can't do:

  git blame -- :/Makefile

So blame has to be converted to use pathspec semantics, and should
error out when the pathspec doesn't match the concrete path of a file.