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From: ZheNing Hu <adlternative@gmail.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>,
	ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
	git <git@vger.kernel.org>
Subject: Re: [PATCH v9 2/2] [GSOC] trailer: add new .cmd config option
Date: Tue, 13 Apr 2021 20:02:47 +0800
Message-ID: <CAOLTT8TB9UF5z-51pLxdkRUxo5-w2+_U_e1wpDAdzBBmT3Og7w@mail.gmail.com> (raw)
In-Reply-To: <CAP8UFD1r2kUaKbjFcRn_FGxz5=hvwY+DHdmPKR61cNdHzBe26A@mail.gmail.com>

Hi, Christian and Junio,

Christian Couder <christian.couder@gmail.com> 于2021年4月13日周二 下午3:33写道:
>
> On Mon, Apr 12, 2021 at 10:51 PM Junio C Hamano <gitster@pobox.com> wrote:
> >
> > "ZheNing Hu via GitGitGadget" <gitgitgadget@gmail.com> writes:
> >
> > > +For consistency, the $1 is also passed, this time with the empty string,
> > > +in the command when the command is first called to add a trailer with
> > > +the specified <token>.
> >
> > I guess the same question as 1/2 applies to this part.  I am not
> > sure what "consistency" the behaviour of calling the configured
> > command with no argument is trying to achieve.  To me, .cmd doing
> > this may be for consistency with .command but I am not sure why
> > the consistency is even desirable.
>
> It might be desirable to make it easier for people to migrate from
> ".command" to ".cmd". I agree this is debatable, but I don't see a big
> downside in it. Maybe, if no argument was passed at all the first time
> the command is called instead of the empty string, the command could
> then know that it's called for the first time. I am not sure this
> would be very helpful in practice though.
>

If i'm not wrong, Christan meant that this command must run so it's
"consistency", and Junio thinks this "consistency" is not needed.

It is true that there is not much harm in keeping `.cmd` at the behavior
of `.command` now. But I remember the `trailer.<token>.runmode` that
Christan said before, perhaps adding it in the subsequent iterations can
solve Junio's doubts. Sometimes I also confirm that the behavior of
`git interpret-trailers` is very strange too.

> > > +$ cat ~/bin/gcount
> > > +#!/bin/sh
> > > +test -n "$1" && git shortlog -s --author="$1" HEAD || true
> > > +$ git config trailer.cnt.key "Commit-count: "
> > > +$ git config trailer.cnt.ifExists "replace"
> > > +$ git config trailer.cnt.cmd "~/bin/gcount"
> > > +$ git interpret-trailers --trailer="cnt:Junio" <<EOF
> > > +> subject
> > > +>
> > > +> message
> > > +>
> > > +> EOF
> > > +subject
> > > +
> > > +message
> > > +
> > > +Commit-count: 22484     Junio C Hamano
> > > +------------
> >
> > This and the other (omitted) example demonstrates how the initial
> > "empty" invocation is useless by using "replace".  Which also means
> > that you cannot add more than one trailer of the same <key> with the
> > mechanism (since the older ones are replaced with the latest).
>
> You can add more than one trailer with the same key if you don't use
> "replace" but use "--trim-empty" on the command line, so that an empty
> trailer added by the initial invocation is removed. And we can later
> add a `trailer.<token>.runMode` to remove the initial invocation.
>

Yes, something like:

trailer.see.command=echo "$ARG"

git interpret-trailers --trim-empty --trailer="see = lll"
--trailer="see:jj"</dev/null

see: lll
see: jj

> > The code change and the test change are consistent with the design,
> > though.
>
> Yeah, this patch looks good to me now.
>
> Thanks!

So is there anything else should I improve?

Thanks.
--
ZheNing Hu

  reply index

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 14:53 [PATCH] [GSOC]trailer: change $ARG to environment variable ZheNing Hu via GitGitGadget
2021-03-24 15:42 ` [PATCH v2] [GSOC]trailer: pass arg as positional parameter ZheNing Hu via GitGitGadget
2021-03-24 20:18   ` Junio C Hamano
2021-03-25  1:43     ` ZheNing Hu
2021-03-25 11:53   ` [PATCH v3] " ZheNing Hu via GitGitGadget
2021-03-25 22:28     ` Junio C Hamano
2021-03-26 13:29       ` ZheNing Hu
2021-03-26 16:13     ` [PATCH v4] " ZheNing Hu via GitGitGadget
2021-03-27 18:04       ` Junio C Hamano
2021-03-27 19:53         ` Christian Couder
2021-03-28 10:46           ` ZheNing Hu
2021-03-29  9:04             ` Christian Couder
2021-03-29 13:43               ` ZheNing Hu
2021-03-30  8:45                 ` Christian Couder
2021-03-30 11:22                   ` ZheNing Hu
2021-03-30 15:07                     ` ZheNing Hu
2021-03-30 17:14                       ` Junio C Hamano
2021-03-31  5:14                         ` ZheNing Hu
2021-03-31 18:19                           ` Junio C Hamano
2021-03-31 18:29                             ` Junio C Hamano
2021-04-01  3:56                               ` ZheNing Hu
2021-04-01 19:49                                 ` Junio C Hamano
2021-04-02  2:08                                   ` ZheNing Hu
2021-04-01  3:39                             ` ZheNing Hu
2021-03-31 10:05       ` [PATCH v5 0/2] " ZheNing Hu via GitGitGadget
2021-03-31 10:05         ` [PATCH v5 1/2] [GSOC] run-command: add shell_no_implicit_args option ZheNing Hu via GitGitGadget
2021-04-01  7:22           ` Christian Couder
2021-04-01  9:58             ` ZheNing Hu
2021-03-31 10:05         ` [PATCH v5 2/2] [GSOC]trailer: pass arg as positional parameter ZheNing Hu via GitGitGadget
2021-04-01  7:28         ` [PATCH v5 0/2] " Christian Couder
2021-04-01 10:02           ` ZheNing Hu
2021-04-02 13:26         ` [PATCH v6] [GSOC] trailer: add new trailer.<token>.cmd config option ZheNing Hu via GitGitGadget
2021-04-02 20:48           ` Junio C Hamano
2021-04-03  5:08             ` ZheNing Hu
2021-04-04  5:34               ` Junio C Hamano
2021-04-03  5:51             ` Christian Couder
2021-04-04 23:26               ` Junio C Hamano
2021-04-06  3:47                 ` Christian Couder
2021-04-06  3:52                   ` Christian Couder
2021-04-06  5:16                     ` ZheNing Hu
2021-04-06  5:34                       ` Junio C Hamano
2021-04-06  5:37                       ` Junio C Hamano
2021-04-04  5:43             ` ZheNing Hu
2021-04-04  8:52               ` Christian Couder
2021-04-04  9:53                 ` ZheNing Hu
2021-04-02 23:44           ` Junio C Hamano
2021-04-03  3:22             ` ZheNing Hu
2021-04-03  4:31               ` Junio C Hamano
2021-04-03  5:15                 ` ZheNing Hu
2021-04-04 13:11           ` [PATCH v7] " ZheNing Hu via GitGitGadget
2021-04-06 16:23             ` Christian Couder
2021-04-07  4:51               ` ZheNing Hu
2021-04-09 13:37             ` [PATCH v8 0/2] [GSOC] trailer: add new .cmd " ZheNing Hu via GitGitGadget
2021-04-09 13:37               ` [PATCH v8 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-09 19:02                 ` Christian Couder
2021-04-10 13:40                   ` ZheNing Hu
2021-04-09 13:37               ` [PATCH v8 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-09 20:18                 ` Christian Couder
2021-04-10 14:09                   ` ZheNing Hu
2021-04-09 19:59               ` [PATCH v8 0/2] " Christian Couder
2021-04-12 16:39               ` [PATCH v9 " ZheNing Hu via GitGitGadget
2021-04-12 16:39                 ` [PATCH v9 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-12 20:42                   ` Junio C Hamano
2021-04-16 12:03                     ` Christian Couder
2021-04-17  1:54                       ` Junio C Hamano
2021-04-12 16:39                 ` [PATCH v9 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-12 20:51                   ` Junio C Hamano
2021-04-13  7:33                     ` Christian Couder
2021-04-13 12:02                       ` ZheNing Hu [this message]
2021-04-13 19:18                         ` Junio C Hamano
2021-04-14 13:27                           ` ZheNing Hu
2021-04-14 20:33                             ` Junio C Hamano
2021-04-15 15:32                               ` ZheNing Hu
2021-04-15 17:41                                 ` Junio C Hamano
2021-04-16 12:54                               ` Christian Couder
2021-04-13 18:14                       ` Junio C Hamano
2021-04-16  8:47                 ` [PATCH v10 0/2] " ZheNing Hu via GitGitGadget
2021-04-16  8:47                   ` [PATCH v10 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-16 19:11                     ` Junio C Hamano
2021-04-16  8:47                   ` [PATCH v10 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-16 19:13                     ` Junio C Hamano
2021-04-16 19:21                     ` Junio C Hamano
2021-04-16 19:25                       ` Junio C Hamano
2021-04-17  2:58                         ` Junio C Hamano
2021-04-17  3:36                           ` Junio C Hamano
2021-04-17  7:41                             ` ZheNing Hu
2021-04-17  8:11                               ` Junio C Hamano
2021-04-17 15:13                   ` [PATCH v11 0/2] " ZheNing Hu via GitGitGadget
2021-04-17 15:13                     ` [PATCH v11 1/2] [GSOC] docs: correct description of .command ZheNing Hu via GitGitGadget
2021-04-17 15:13                     ` [PATCH v11 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-17 22:26                     ` [PATCH v11 0/2] " Junio C Hamano
2021-04-18  7:47                       ` ZheNing Hu
2021-04-21  0:09                         ` Junio C Hamano
2021-04-21  5:47                           ` ZheNing Hu
2021-04-21 23:40                             ` Junio C Hamano
2021-04-22  9:20                               ` ZheNing Hu
2021-04-27  6:49                                 ` Junio C Hamano
2021-04-27 12:24                                   ` ZheNing Hu
2021-05-03 15:41                     ` [PATCH v12 " ZheNing Hu via GitGitGadget
2021-05-03 15:41                       ` [PATCH v12 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-05-03 15:41                       ` [PATCH v12 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget

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