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From: "Đoàn Trần Công Danh" <congdanhqx@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>
Subject: Re: [PATCH v3 1/2] revision: differentiate if --no-abbrev asked explicitly
Date: Fri, 14 Aug 2020 07:59:47 +0700	[thread overview]
Message-ID: <20200814005947.GA9518@danh.dev> (raw)
In-Reply-To: <xmqq8sei125k.fsf@gitster.c.googlers.com>

On 2020-08-13 17:50:31-0700, Junio C Hamano <gitster@pobox.com> wrote:
> Đoàn Trần Công Danh  <congdanhqx@gmail.com> writes:
> 
> > When we see --no-abbrev in command's arguments, we reset the 'abbrev'
> > field in diff-options to 0 and this value will be looked at
> > diff_abbrev_oid() to decide not to truncate the object name.
> >
> > In a later change, we want to extend --abbrev support to diff-patch
> > format. When --abbrev supporting diff-patch, we need to differentiate
> > those below scenarios:
> >
> > * None of those options --abbrev, --no-abbrev, and --full-index are
> >   asked. diff-patch should keep old behavior of using DEFAULT_ABBREV
> >   for the index length.
> > * --no-abbrev is asked, diff-patch should treat this option as same as
> >   --full-index and show full object name in index line.
> 
> Sorry, but are you saying that the above two cases cannot be
> differentiated in the current code?
> 
>  * If none of --abbrev, --no-abbrev, --full-index are given, then
>    diff.c::prep_parse_options() will leave options->flags.full_index
>    and options->abbrev untouched.  They are initialized to false and
>    DEFAULT_ABBREV (typically -1 when unconfigured).
> 
>  * If --no-abbrev is given, options->abbrev is set to 0.
>    options->flags.full_index is not touched.
> 
> So you should be able to tell these two apart by only looking at
> options->flags.full_index bit.  Perhaps, even though you said "we
> need to differentiate", you meant something else?

Oops, I shouldn't say anything about --full-index in the second point
to reduce confusion.

Let me list some combination here:

* none of --abbrev --no-abbrev --full-index -> default short index
* --abbrev --full-index                     -> full-index
* --full-index --abbrev                     -> full-index
* --abbrev --no-abbrev                      -> full-index
* --no-abbrev --abbrev=[n]                  -> shortened index to n char

So, we can't use full_index bit, because --no-abbrev can be defeated
by --abbrev, but --full-index will always win --abbrev.

> 
> > While not doing anything is very effective way to show full object id,
> > we couldn't differentiate if --no-abbrev or not.
> 
> Hmph.  --no-abbrev without --full-index would not set
> flags.full_index bit; using --full-index would set the bit.  Are you
> planning to do something special when BOTH --no-abbrev and --full-index
> is given?  I am confused X-<.

I'm not planning for anything special when both --no-abbrev and
--full-index is given.

I'm planning for:

* BOTH --abbrev and --no-abbrev but NOT --full-index;
* BOTH --abbrev AND --full-index

Sorry for the confusion,
I hope it's clear now, and you could help me rephase a bit to reduce
confusion.

-- 
Danh

  reply	other threads:[~2020-08-14  0:59 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-09  2:19 [RFC PATCH 0/2] extend --abbrev support to diff-patch format Đoàn Trần Công Danh
2020-08-09  2:19 ` [RFC PATCH 1/2] revision: differentiate if --no-abbrev asked explicitly Đoàn Trần Công Danh
2020-08-09  2:19 ` [RFC PATCH 2/2] diff: extend --abbrev support to diff-patch format Đoàn Trần Công Danh
2020-08-09 19:01 ` [RFC PATCH 0/2] " Junio C Hamano
2020-08-10 10:00   ` Jeff King
2020-08-10 12:31     ` Đoàn Trần Công Danh
2020-08-10 15:15       ` Junio C Hamano
2020-08-10 15:27         ` Jeff King
2020-08-11  0:33           ` Đoàn Trần Công Danh
2020-08-11  5:22             ` Jeff King
2020-08-11 12:07               ` Đoàn Trần Công Danh
2020-08-10 15:06     ` Junio C Hamano
2020-08-11 11:49 ` [PATCH v2 0/2] diff: index-line: respect --abbrev in object's name Đoàn Trần Công Danh
2020-08-11 11:49   ` [PATCH v2 1/2] revision: differentiate if --no-abbrev asked explicitly Đoàn Trần Công Danh
2020-08-11 18:54     ` Junio C Hamano
2020-08-11 11:49   ` [PATCH v2 2/2] diff: index-line: respect --abbrev in object's name Đoàn Trần Công Danh
2020-08-14  0:23 ` [PATCH v3 0/2] " Đoàn Trần Công Danh
2020-08-14  0:23   ` [PATCH v3 1/2] revision: differentiate if --no-abbrev asked explicitly Đoàn Trần Công Danh
2020-08-14  0:50     ` Junio C Hamano
2020-08-14  0:59       ` Đoàn Trần Công Danh [this message]
2020-08-14  1:06         ` Junio C Hamano
2020-08-14 14:50           ` Đoàn Trần Công Danh
2020-08-19 22:50             ` Junio C Hamano
2020-08-14  0:23   ` [PATCH v3 2/2] diff: index-line: respect --abbrev in object's name Đoàn Trần Công Danh
2020-08-14 15:18     ` SZEDER Gábor
2020-08-14 17:00       ` Junio C Hamano
2020-08-14 18:59         ` Junio C Hamano
2020-08-15  0:21           ` brian m. carlson
2020-08-15  2:27             ` Đoàn Trần Công Danh
2020-08-17 16:17               ` Junio C Hamano
2020-08-20  4:56               ` Junio C Hamano
2020-08-20 12:35 ` [PATCH v4 0/2] " Đoàn Trần Công Danh
2020-08-20 12:35   ` [PATCH v4 1/2] t4013: improve diff-post-processor logic Đoàn Trần Công Danh
2020-08-20 19:49     ` Junio C Hamano
2020-08-21 12:05       ` Đoàn Trần Công Danh
2020-08-21 15:44         ` Junio C Hamano
2020-08-20 12:35   ` [PATCH v4 2/2] diff: index-line: respect --abbrev in object's name Đoàn Trần Công Danh
2020-08-20 19:58     ` Junio C Hamano
2020-08-21 11:51 ` [PATCH v5 0/2] " Đoàn Trần Công Danh
2020-08-21 11:51   ` [PATCH v5 1/2] t4013: improve diff-post-processor logic Đoàn Trần Công Danh
2020-08-21 11:51   ` [PATCH v5 2/2] diff: index-line: respect --abbrev in object's name Đoàn Trần Công Danh

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