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From: Junio C Hamano <gitster@pobox.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Jeff Hostetler <git@jeffhostetler.com>,
	Jeff King <peff@peff.net>
Subject: Re: [PATCH v5 1/9] Start to implement a built-in version of `git add --interactive`
Date: Mon, 11 Nov 2019 21:09:48 +0900	[thread overview]
Message-ID: <xmqqeeyehawj.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.1911110949590.46@tvgsbejvaqbjf.bet> (Johannes Schindelin's message of "Mon, 11 Nov 2019 10:15:00 +0100 (CET)")

Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> And I agree that this sidetrack is totally irrelevant for the patch
> under discussion.
>
> I do think, however, that the discussion of "we wanted to do it the
> other way, but when we tried, it did not work" is relevant, even if I
> shortened it to "we use a different approach than previous conversions,
> because that previous approach would not work".

Regardless of the language the scripted version was written in, I
think the '--helper' approach is always the poorer choice between
the two [*1*].  It limits the modular decomposition to what suits the
original language, the impedance mismatch between the original and
target language forces us to unnatural style of inter module
communication, and the unnatural interface layer, which we know has
to be discarded at the end, must be written [*2*].

So, I'd prefer to see "because this is a better way in the longer
term" over "because the --helper approach would not work".

[Footnote]

*1* In only one case I would recommend using "--helper" approach,
    though.  When you are not expecting the developer to be able to
    come up with a better split of the program into modules than how
    the scripted version is, and you want to ensure that the
    developer have something to show when they faild to complete the
    project after N weeks.  You are a more experienced developer
    than an average GSoC student, and there is no pencils-down time,
    so the exception would not apply.

*2* In "git submodule" for example it was quite natural for the
    module that gives a list of submodules with its traits the
    program cares about to be written as a shell function that
    writes the data to its standard output.  And consuming modules
    sit at the downstream of a pipe, accepting its output.  When you
    are writing these modules both in C, you wouldn't connect them
    with pipe to carry the list of submodules, but a piecemeal
    conversion using the "--helper" approach meant that there always
    remained _some_ consumer that wants to read from the pipe, so
    long after the module lister was rewritten in C, it still needed
    to support a mode where it sends its output to the pipe, instead
    of just passing an array of structures.

  reply	other threads:[~2019-11-11 12:09 UTC|newest]

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-10 17:37 [PATCH 00/11] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin via GitGitGadget
2019-04-10 17:37 ` [PATCH 01/11] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-04-18 14:31   ` Jeff Hostetler
2019-04-18 16:06     ` Jeff King
2019-04-30 23:40       ` Johannes Schindelin
2019-05-01  2:21         ` Jeff King
2019-05-13 11:14           ` Johannes Schindelin
2019-04-10 17:37 ` [PATCH 02/11] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-04-10 17:37 ` [PATCH 03/11] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-04-10 17:37 ` [PATCH 04/11] built-in add -i: refresh the index before running `status` Johannes Schindelin via GitGitGadget
2019-04-10 17:37 ` [PATCH 05/11] built-in add -i: color the header in the `status` command Johannes Schindelin via GitGitGadget
2019-04-10 17:37 ` [PATCH 07/11] Add a function to determine unique prefixes for a list of strings Slavica Djukic via GitGitGadget
2019-04-18 17:57   ` Jeff Hostetler
2019-05-13 12:48     ` Johannes Schindelin
2019-04-10 17:37 ` [PATCH 06/11] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-04-18 16:49   ` Jeff Hostetler
2019-05-13 12:04     ` Johannes Schindelin
2019-04-10 17:37 ` [PATCH 08/11] built-in add -i: show unique prefixes of the commands Slavica Djukic via GitGitGadget
2019-04-10 17:37 ` [PATCH 09/11] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-04-10 17:37 ` [PATCH 10/11] built-in add -i: use color in the main loop Slavica Djukic via GitGitGadget
2019-04-10 17:37 ` [PATCH 11/11] built-in add -i: implement the `help` command Johannes Schindelin via GitGitGadget
2019-05-13 17:27 ` [PATCH v2 00/11] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 01/11] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 02/11] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 03/11] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 04/11] built-in add -i: refresh the index before running `status` Johannes Schindelin via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 06/11] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 05/11] built-in add -i: color the header in the `status` command Johannes Schindelin via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 07/11] Add a function to determine unique prefixes for a list of strings Slavica Djukic via GitGitGadget
2019-05-13 17:27   ` [PATCH v2 08/11] built-in add -i: show unique prefixes of the commands Slavica Djukic via GitGitGadget
2019-05-13 17:28   ` [PATCH v2 09/11] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-05-13 17:28   ` [PATCH v2 10/11] built-in add -i: use color in the main loop Slavica Djukic via GitGitGadget
2019-05-13 17:28   ` [PATCH v2 11/11] built-in add -i: implement the `help` command Johannes Schindelin via GitGitGadget
2019-07-16 14:58   ` [PATCH v3 00/11] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 01/11] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-07-31 17:52       ` Junio C Hamano
2019-08-26 21:26         ` Johannes Schindelin
2019-08-27 22:25           ` Junio C Hamano
2019-08-28 15:06             ` Johannes Schindelin
2019-08-28 15:37               ` Junio C Hamano
2019-07-16 14:58     ` [PATCH v3 02/11] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-07-31 17:59       ` Junio C Hamano
2019-08-27  9:22         ` Johannes Schindelin
2019-07-16 14:58     ` [PATCH v3 03/11] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-07-31 18:12       ` Junio C Hamano
2019-08-27 10:04         ` Johannes Schindelin
2019-07-16 14:58     ` [PATCH v3 04/11] built-in add -i: refresh the index before running `status` Johannes Schindelin via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 05/11] built-in add -i: color the header in the `status` command Johannes Schindelin via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 06/11] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-07-31 18:14       ` Junio C Hamano
2019-07-16 14:58     ` [PATCH v3 08/11] built-in add -i: show unique prefixes of the commands Slavica Djukic via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 07/11] Add a function to determine unique prefixes for a list of strings Slavica Djukic via GitGitGadget
2019-07-31 18:39       ` Junio C Hamano
2019-08-24 12:38       ` SZEDER Gábor
2019-08-27 12:14         ` Johannes Schindelin
2019-08-28 16:30           ` SZEDER Gábor
2019-08-28 16:34             ` [PATCH] [PoC] A simpler find_unique_prefixes() implementation SZEDER Gábor
2019-08-30 20:12               ` Johannes Schindelin
2019-07-16 14:58     ` [PATCH v3 09/11] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 10/11] built-in add -i: use color in the main loop Slavica Djukic via GitGitGadget
2019-07-16 14:58     ` [PATCH v3 11/11] built-in add -i: implement the `help` command Johannes Schindelin via GitGitGadget
2019-08-02 21:04       ` Junio C Hamano
2019-08-02 22:26         ` Jeff King
2019-07-16 18:38     ` [PATCH v3 00/11] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin
2019-08-02 21:06       ` Junio C Hamano
2019-08-27 12:57     ` [PATCH v4 " Johannes Schindelin via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 01/11] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 02/11] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 03/11] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 04/11] built-in add -i: refresh the index before running `status` Johannes Schindelin via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 05/11] built-in add -i: color the header in the `status` command Johannes Schindelin via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 06/11] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 07/11] Add a function to determine unique prefixes for a list of strings Slavica Djukic via GitGitGadget
2019-08-27 12:57       ` [PATCH v4 08/11] built-in add -i: show unique prefixes of the commands Slavica Djukic via GitGitGadget
2019-08-27 12:58       ` [PATCH v4 09/11] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-08-27 12:58       ` [PATCH v4 11/11] built-in add -i: implement the `help` command Johannes Schindelin via GitGitGadget
2019-08-27 12:58       ` [PATCH v4 10/11] built-in add -i: use color in the main loop Slavica Djukic via GitGitGadget
2019-11-04 12:15       ` [PATCH v5 0/9] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin via GitGitGadget
2019-11-04 12:15         ` [PATCH v5 1/9] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-11-08  4:49           ` Junio C Hamano
2019-11-09 11:06             ` Johannes Schindelin
2019-11-10  7:18               ` Junio C Hamano
2019-11-11  9:15                 ` Johannes Schindelin
2019-11-11 12:09                   ` Junio C Hamano [this message]
2019-11-12 15:03                     ` Johannes Schindelin
2019-11-13  3:54                       ` Junio C Hamano
2019-11-13 12:30                         ` Johannes Schindelin
2019-11-13 14:01                           ` Junio C Hamano
2019-11-04 12:15         ` [PATCH v5 2/9] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-11-08  4:56           ` Junio C Hamano
2019-11-04 12:15         ` [PATCH v5 3/9] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-11-08  5:01           ` Junio C Hamano
2019-11-04 12:15         ` [PATCH v5 4/9] built-in add -i: color the header in " Slavica Đukić via GitGitGadget
2019-11-04 12:15         ` [PATCH v5 5/9] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-11-08  5:17           ` Junio C Hamano
2019-11-09 11:21             ` Johannes Schindelin
2019-11-04 12:15         ` [PATCH v5 6/9] built-in add -i: show unique prefixes of the commands Johannes Schindelin via GitGitGadget
2019-11-04 12:15         ` [PATCH v5 7/9] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-11-04 12:15         ` [PATCH v5 8/9] built-in add -i: use color in the main loop Slavica Đukić via GitGitGadget
2019-11-04 12:15         ` [PATCH v5 9/9] built-in add -i: implement the `help` command Slavica Đukić via GitGitGadget
2019-11-13 12:40         ` [PATCH v6 0/9] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin via GitGitGadget
2019-11-13 12:40           ` [PATCH v6 1/9] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-11-14  2:15             ` Junio C Hamano
2019-11-14 15:07               ` Johannes Schindelin
2019-11-15  4:35                 ` Junio C Hamano
2019-11-13 12:40           ` [PATCH v6 2/9] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-11-13 12:40           ` [PATCH v6 3/9] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 4/9] built-in add -i: color the header in " Slavica Đukić via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 5/9] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 6/9] built-in add -i: show unique prefixes of the commands Johannes Schindelin via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 7/9] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 8/9] built-in add -i: use color in the main loop Slavica Đukić via GitGitGadget
2019-11-13 12:41           ` [PATCH v6 9/9] built-in add -i: implement the `help` command Slavica Đukić via GitGitGadget
2019-11-13 12:46           ` [PATCH v6 0/9] git add -i: add a rudimentary version in C (supporting only status and help so far) Johannes Schindelin
2019-11-15 11:11           ` [PATCH v7 " Johannes Schindelin via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 1/9] Start to implement a built-in version of `git add --interactive` Johannes Schindelin via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 2/9] diff: export diffstat interface Daniel Ferreira via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 3/9] built-in add -i: implement the `status` command Daniel Ferreira via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 4/9] built-in add -i: color the header in " Slavica Đukić via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 5/9] built-in add -i: implement the main loop Johannes Schindelin via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 6/9] built-in add -i: show unique prefixes of the commands Johannes Schindelin via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 7/9] built-in add -i: support `?` (prompt help) Johannes Schindelin via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 8/9] built-in add -i: use color in the main loop Slavica Đukić via GitGitGadget
2019-11-15 11:11             ` [PATCH v7 9/9] built-in add -i: implement the `help` command Slavica Đukić via GitGitGadget

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