Re: [PATCH v8 1/2] [GSOC] docs: correct descript of trailer.<token>.command

[ZheNing Hu <adlternative@gmail.com>]

Christian Couder <christian.couder@gmail.com> 于2021年4月10日周六 上午3:02写道：
>
> On Fri, Apr 9, 2021 at 3:37 PM ZheNing Hu via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
> >
> > From: ZheNing Hu <adlternative@gmail.com>
> >
> > In the original documentation of `trailer.<token>.command`,
> > some descriptions are easily misunderstood. So let's modify
> > it to increase its readability.
> >
> > In addition, clarify that `$ARG` in command can only be
> > replaced once since `$ARG` is text replacement.
>
> I think you can remove the "since `$ARG` is text replacement" part.
> Otherwise this looks fine.
>

Ok.

> > Signed-off-by: ZheNing Hu <adlternative@gmail.com>
> > ---
> >  Documentation/git-interpret-trailers.txt | 22 +++++++++++-----------
> >  1 file changed, 11 insertions(+), 11 deletions(-)
> >
> > diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
> > index 96ec6499f001..3e5aa3a65ae9 100644
> > --- a/Documentation/git-interpret-trailers.txt
> > +++ b/Documentation/git-interpret-trailers.txt
> > @@ -237,20 +237,20 @@ trailer.<token>.command::
> >         specified <token>.
>
> The beginning of the doc for trailer.<token>.command could already be
> improved. It is:
>
>        This option can be used to specify a shell command that will
>        be called to automatically add or modify a trailer with the
>        specified <token>.
>
> Instead we could say for example:
>
>        This option can be used to specify a shell command that will
>        be called:
>          - once to automatically add a trailer with the specified
> <token>, and then
>          - each time a '--trailer <token>=<value>' argument to modify
> the <value> of the trailer that this option would produce
>
> >  When this option is specified, the behavior is as if a special
>
> I would rather say:
>
> When the specified command is first called to add a trailer with the
> specified <token>, the behavior is as if a special
>
> > -'<token>=<value>' argument were added at the beginning of the command
> > -line, where <value> is taken to be the standard output of the
> > -specified command with any leading and trailing whitespace trimmed
> > -off.
> > +'--trailer <token>=<value>' argument was added at the beginning of
> > +the "git interpret-trailers" command, where <value> is taken to be the
> > +standard output of the specified command with any leading and trailing
>
> Here we can remove "specified" as we now use it at the beginning of
> the sentence.
>
> > +whitespace trimmed off.
> >  +
> > -If the command contains the `$ARG` string, this string will be
> > -replaced with the <value> part of an existing trailer with the same
> > -<token>, if any, before the command is launched.
> > +The first occurrence of substring `$ARG` will be replaced with the
> > +<value> part of an existing trailer with the same <token>, if any,
> > +before the command is launched.
>
> I think we should not talk about `$ARG` at this point, let's remove
> this and see what we can do below in the next paragraph or after it.
>

Here I may want to keep the content similar to the original paragraph.
But if you say so, it will be fine.

> >  If some '<token>=<value>' arguments are also passed on the command
>
> s/'<token>=<value>'/'--trailer <token>=<value>'/
>
> > -line, when a 'trailer.<token>.command' is configured, the command will
> > -also be executed for each of these arguments. And the <value> part of
> > -these arguments, if any, will be used to replace the `$ARG` string in
> > -the command.
> > +line, when a 'trailer.<token>.command' is configured, the command is run
>
> s/when a 'trailer.<token>.command' is configured, //
> s/the command is run/the command is called again/
>
> > +once for each these arguments with the same <token>.
>
> s/each these/each of these/
>
> > And the <value>
> > +part of these arguments, if any, will be used to replace the first `$ARG`
> > +string in the command.
>
> s/first `$ARG` string/first occurrence of substring `$ARG`/
>
> Let's also add something to explain the purpose of this, for example
> we could add:
>
> "This way the command can produce a <value> computed from the <value>
> passed in the '--trailer <token>=<value>' argument."
>
> And then let's also explain what happens when the command is called
> the first time, with for example:
>
> "For consistency, the first occurrence of substring `$ARG` is also
> replaced, this time with the empty string, in the command when the
> command is first called to add a trailer with the specified <token>."
>
> To sum up this would give the following (not properly formatted) description:
>
> -------------------
> trailer.<token>.command::
>        This option can be used to specify a shell command that will be called:
>          - once to automatically add a trailer with the specified
> <token>, and then
>          - each time a '--trailer <token>=<value>' argument to modify
> the <value> of the trailer that this option would produce
>

Maybe I am a little confused: this two "-" meaning? Shouldn't it be the
same paragraph?

-       This option can be used to specify a shell command that will
-       be called to automatically add or modify a trailer with the
-       specified <token>.
+       This option can be used to specify a shell command that will be called:
+       - once to automatically add a trailer with the specified
<token>, and then
+       - each time a '--trailer <token>=<value>' argument to modify
the <value> of
+       the trailer that this option would produce.

Wouldn't it be weird?

>        When the specified command is first called to add a trailer
> with the specified <token>, the behavior is as if a special
>        '--trailer <token>=<value>' argument was added at the beginning
> of the "git interpret-trailers" command, where <value>
>        is taken to be the standard output of the command with any
> leading and trailing whitespace trimmed off.
>
>        If some '--trailer <token>=<value>' arguments are also passed
> on the command
>        line, the command is called again once for each of these
> arguments with the same <token>.
>        And the <value> part of these arguments, if any, will be used
> to replace the first occurrence
>        of substring `$ARG` in the command. This way the command can
> produce a <value>
>        computed from the <value> passed in the '--trailer
> <token>=<value>' argument.
>
>        For consistency, the first occurrence of substring `$ARG` is
> also replaced, this time with the
>        empty string, in the command when the command is first called
> to add a trailer with the
>        specified <token>.
> -------------------
>
> Thanks!

Thanks a lot!
It looks more professional than what I wrote.

--
ZheNing Hu