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From: Denton Liu <liu.denton@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Elijah Newren <newren@gmail.com>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Git Mailing List <git@vger.kernel.org>,
	vincent.guittot@linaro.org
Subject: Re: [Bug report] git diff stat shows unrelated diff
Date: Fri, 15 Feb 2019 10:52:02 -0800
Message-ID: <20190215185202.GA28019@dev-l> (raw)
In-Reply-To: <xmqqmumy6mxe.fsf@gitster-ct.c.googlers.com>

On Thu, Feb 14, 2019 at 02:10:53PM -0800, Junio C Hamano wrote:
> Elijah Newren <newren@gmail.com> writes:
> 
> > The only thing I seem to be able to retain is the following:  "git
> > diff D..E is totally useless and should be an error because (1) it
> > doesn't do what I expect and (2) for folks that want the behavior
> > currently gotten with that syntax can instead just use a space instead
> > of a double dot."
> 
> That sums up pretty nicely.  diff is fundamentally an operation
> between two endpoints, so the range notation a..b does not work
> nicely with it at the conceptual level.
> 
> When we realized that we can take advantage of the above fact, and
> reuse a range notation to mean something that is generally useful in
> the context of diff, such as 'one end of the comparison is the merge
> base between a and b, and the other end is b', it was too late to
> use "a..b", as an early adopters of Git was already used to the fact
> that "a..b" happened to mean the same thing as "comparison of one
> end is a, the other end is b", pretty much implemented without much
> thought.
> 
> It might be _possible_ to spend a year (i.e. 4 cycles) to start
> warning when two-dot notation is used for "git diff" (only, not any
> plumbing like "git diff-files") and tell the user to use the more
> logical two-end notation "git diff A B" and then eventually error
> out when two-dot notation is used, while retaining the three-dot
> notation throughout and to the eternity.  I am not sure if it is
> worth the deprecation cost, though.
> 
Instead of outright deprecating it, would it make sense to include a
configuration option, say "diff.sensibleDots", that would enable a user
to set the dots to the other form if they desire?

This has bugged me for long enough that if there's a desire for this
from others, I'm willing take on the effort of making this change.

Thanks,

Denton

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14  8:22 Viresh Kumar
2019-02-14 18:42 ` Johannes Sixt
2019-02-14 21:23 ` Elijah Newren
2019-02-14 22:10   ` Junio C Hamano
2019-02-15 18:52     ` Denton Liu [this message]
2019-02-15 19:25       ` Elijah Newren
2019-02-15 20:12         ` Junio C Hamano
2019-02-15 22:48           ` Philip Oakley
2019-02-15 23:32             ` Junio C Hamano
2019-02-16 12:47               ` Philip Oakley
2019-02-17  3:34                 ` Junio C Hamano
2019-02-17 23:34                   ` Philip Oakley
2019-02-18  0:21                     ` Junio C Hamano
2019-02-15 19:28       ` Junio C Hamano
2019-02-15  6:40   ` Viresh Kumar
2019-02-15 16:09     ` Elijah Newren
2019-02-18  4:34       ` Viresh Kumar

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