linux-kernel - Re: [PATCH] Documentation: RCU: use code blocks with autogenerated line (was: Re: linux-next: build warning after merge of the rcu tree)

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Date:   Tue, 8 Nov 2022 23:53:46 +0900
From:   Akira Yokosawa <akiyks@...il.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     corbet@....net, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org, paulmck@...nel.org, rcu@...r.kernel.org
Subject: Re: [PATCH] Documentation: RCU: use code blocks with autogenerated
 line (was: Re: linux-next: build warning after merge of the rcu tree)

[Dropping most CCs]

On Tue, 8 Nov 2022 09:29:01 +0700, Bagas Sanjaya wrote:
> On 11/7/22 18:48, Akira Yokosawa wrote:
>> That might be true if all you care about were the generated documents,
>> but we need to pay attention to readers of .rst files as plain-text.
>>
>> There are a bunch of references to line numbers in RCU documents.
>> If explicit line numbers are removed from snippets, such readers need
>> to count the lines by themselves, which doesn't sound reasonable to me.
>>
> 
> I think only rcubarrier.rst have explicit references to line numbers.

Oh, I find such references in (not limited to):

  - Documentation/RCU/Design/Requirements/Requirements.rst
  - Documentation/RCU/Design/Data-Structures/Data-Structures.rst

> 
> Also, besides manual line counting, readers seeing rst sources can deduce
> where actually the lines are from explanation of the snippet.

Maybe, maybe not... Deducing may take time.

>                                                               Of course
> they can make htmldocs and seeing the output if they want.

There can be situations where you can't afford such luxuries.

Remember there is a note in Documentation/doc-guide/sphinx.rst
which reads:

  Please don't go overboard with reStructuredText markup. Keep it simple.
  For the most part the documentation should be plain text with just enough
  consistency in formatting that it can be converted to other formats.

My interpretation of above:

  .rst sources should be kept as close to plain-text which can be
  easily understood in dumb terminals, as far as possible.

> 
>> If you can put labels to referenced lines within code snippets, auto
>> generation of line numbers might work, but as far as I know, Sphinx
>> doesn't provide such a nice feature.
>>
> 
> There's also :emphasize-lines: option to highlight selected line numbers.

But that option doesn't do any highlighting while viewing .rst files
as plain-text. What am I missing?

        Thanks, Akira

> 
> Thanks.
>