From: Jeff King <peff@peff.net>
To: Olga Telezhnaya <olyatelezhnaya@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v2 01/18] cat-file: split expand_atom into 2 functions
Date: Mon, 15 Jan 2018 17:09:47 -0500 [thread overview]
Message-ID: <20180115220946.GF4778@sigill.intra.peff.net> (raw)
In-Reply-To: <20180115213335.GB4778@sigill.intra.peff.net>
On Mon, Jan 15, 2018 at 04:33:35PM -0500, Jeff King wrote:
> That works, but I don't think it's where we want to end up in the long
> run. Because:
>
> 1. We still have the set of formats duplicated between expand_atom()
> and the "preparation" step. It's just that the preparation is now
> in ref-filter.c. What happens if ref-filter.c learns new formatting
> placeholders (or options for those placeholders) that cat-file.c
> doesn't, or vice versa? The two have to be kept in sync.
>
> 2. We're missing out on all of the other placeholders that ref-filter
> knows about. Not all of them are meaningful (e.g., %(refname)
> wouldn't make sense here), but part of our goal is to support the
> same set of placeholders as much as possible. Some obvious ones
> that ought to work for cat-file: %(objectname:short), %(if), and
> things like %(subject) when the appropriate object type is used.
>
> In other words, I think the endgame is that expand_atom() isn't there at
> all, and we're calling the equivalent of format_ref_item() for each
> object (except that in a unified formatting world, it probably doesn't
> have the word "ref" in it, since that's just one of the items a caller
> might pass in).
I read carefully up through about patch 6, and then skimmed through the
rest. I think we really want to push this in the direction of more
unification, as above. I know that the patches here may be a step on the
way, but I had a hard time evaluating each patch to see if it was
leading us in the right direction.
I think what would help for reviewing this is:
1. Start with a cover letter that makes it clear what the end state of
the series is, and why that's the right place to end up.
2. Include a rough roadmap of the patches in the cover letter.
Hopefully they should group into a few obvious steps (like "in
patches 1-5, we're teaching ref-filter to support everything that
cat-file can do, then in 6-10 we're preparing cat-file for the
conversion, and then in 11 we do the conversion"). If it doesn't
form a coherent narrative, then it may be worth stepping back and
thinking about combining or reordering the patches in a different
way, so that the progression becomes more plain.
I think one of the things that makes the progression here hard to
understand (for me, anyway) is that it's "inside out" of what I'd
expect. There's a lot of code movement happening first, and then
refactoring and simplifying after that. So between those two steps,
there's a lot of interim ugliness (e.g., having to reach across
module boundaries to look at expand_data). It's hard to tell when
looking at each individual patch how necessary the ugliness is, and
whether and when it's going to go away later in the series.
There's a lot of good work here, and you've figured out a lot about how
the two systems function. I think we just need to rearrange things a bit
to make sure each step is moving in the right direction.
-Peff
next prev parent reply other threads:[~2018-01-15 22:09 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-09 13:05 [PATCH 01/20] cat-file: split expand_atom into 2 functions Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 09/20] cat-file: get rid of goto in ref-filter Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 02/20] cat-file: reuse struct ref_format Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 10/20] cat-file: simplify expand_atom function Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 11/20] cat-file: get rid of duplicate checking Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 16/20] cat-file: get rid of expand_atom_into_fields Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 08/20] cat-file: remove unused code Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 13/20] cat-file: start use ref_array_item struct Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 07/20] cat-file: reuse parse_ref_filter_atom Olga Telezhnaya
2018-01-09 23:32 ` Junio C Hamano
2018-01-09 13:05 ` [PATCH 18/20] cat-file: add split_on_whitespace flag Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 03/20] cat-file: rename variables in ref-filter Olga Telezhnaya
2018-01-09 22:04 ` Junio C Hamano
2018-01-10 7:07 ` Оля Тележная
2018-01-09 13:05 ` [PATCH 06/20] cat-file: start migrating to ref-filter Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 20/20] cat-file: make cat_file_info variable independent Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 19/20] cat-file: move skip_object_info into ref-filter Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 04/20] cat-file: make valid_atoms as a function parameter Olga Telezhnaya
2018-01-09 22:16 ` Junio C Hamano
2018-01-09 13:05 ` [PATCH 05/20] cat-file: move struct expand_data into ref-filter Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 14/20] cat-file: make populate_value global Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 15/20] cat-file: start reusing populate_value Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 12/20] cat-file: rename variable in ref-filter Olga Telezhnaya
2018-01-09 13:05 ` [PATCH 17/20] cat-file: add is_cat flag " Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 01/18] cat-file: split expand_atom into 2 functions Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 14/18] ref-filter: get rid of expand_atom_into_fields Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 12/18] ref-filter: make populate_value global Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 16/18] ref_format: add split_on_whitespace flag Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 04/18] cat-file: move struct expand_data into ref-filter Olga Telezhnaya
2018-01-15 21:44 ` Jeff King
2018-01-16 7:00 ` Оля Тележная
2018-01-17 21:45 ` Jeff King
2018-01-18 5:56 ` Оля Тележная
2018-01-10 9:36 ` [PATCH v2 08/18] ref-filter: get rid of goto Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 10/18] cat-file: get rid of duplicate checking Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 03/18] ref-filter: make valid_atom as function parameter Olga Telezhnaya
2018-01-15 21:42 ` Jeff King
2018-01-16 6:55 ` Оля Тележная
2018-01-17 21:43 ` Jeff King
2018-01-17 22:39 ` Christian Couder
2018-01-18 6:20 ` Оля Тележная
2018-01-18 11:49 ` Оля Тележная
2018-01-18 14:23 ` Christian Couder
2018-01-19 12:24 ` Оля Тележная
2018-01-19 15:48 ` Christian Couder
2018-01-19 17:14 ` Christian Couder
2018-01-19 17:22 ` Оля Тележная
2018-01-19 17:57 ` Christian Couder
2018-01-19 17:23 ` Jeff King
2018-01-19 17:31 ` Christian Couder
2018-01-19 18:47 ` Junio C Hamano
2018-01-19 20:12 ` Jeff King
2018-01-10 9:36 ` [PATCH v2 13/18] cat-file: start reusing populate_value Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 06/18] ref-filter: reuse parse_ref_filter_atom Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 15/18] ref-filter: add is_cat flag Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 09/18] cat-file: simplify expand_atom function Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 05/18] cat-file: start migrating to ref-filter Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 02/18] cat-file: reuse struct ref_format Olga Telezhnaya
2018-01-15 21:37 ` Jeff King
2018-01-16 9:45 ` Оля Тележная
2018-01-10 9:36 ` [PATCH v2 11/18] cat-file: start use ref_array_item struct Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 07/18] cat-file: remove unused code Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 18/18] ref-filter: make cat_file_info independent Olga Telezhnaya
2018-01-10 9:36 ` [PATCH v2 17/18] cat-file: move skip_object_info into ref-filter Olga Telezhnaya
2018-01-15 21:33 ` [PATCH v2 01/18] cat-file: split expand_atom into 2 functions Jeff King
2018-01-15 22:09 ` Jeff King [this message]
2018-01-16 7:22 ` Оля Тележная
2018-01-17 21:49 ` Jeff King
2018-01-17 23:04 ` Christian Couder
2018-01-18 6:22 ` Оля Тележная
2018-01-18 8:45 ` Christian Couder
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