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Re: [PATCH] revisions.txt: mention <rev>~ form

Duy Nguyen <pclouds@xxxxxxxxx> writes:

> On Mon, Apr 22, 2019 at 1:14 PM Denton Liu <liu.denton@xxxxxxxxx> wrote:
>> In revisions.txt, the '<rev>^' form is mentioned but the '<rev>~' form
>> is missing. Although both forms are essentially equivalent (they each
>> get the first parent of the specified revision), we should mention the
>> latter for completeness. Make this change.
> Do we really support this, or is it a bug in rev parsing code that
> treats <rev>~ like <rev>~1?
> Hmm.. digging... ah 621ff67594 (rev-parse: fix meaning of rev~ vs
> rev~0., 2008-03-14) at least it's not an unintended bahaviour.

commit 621ff6759414e2a723f61b6d8fc04b9805eb0c20
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date:   Fri Mar 14 11:49:40 2008 -0700

    rev-parse: fix meaning of rev~ vs rev~0.
    I think it would make more sense for rev~ to have the same guarantees that
    rev^ has, namely to always return a commit. I would also suggest that not
    giving a number would have the same effect of defaulting to 1, not 0.

Yes, I remember that one: if rev^ means rev^1, rev~ should mean
rev~1, not rev or rev~0.