linux-kernel - Re: [PATCH] docs: conf.py: avoid thousands of duplicate label warning on Sphinx

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Date:   Fri, 20 Mar 2020 14:22:43 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Federico Vaga <federico.vaga@...a.pv.it>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] docs: conf.py: avoid thousands of duplicate label
 warning on Sphinx

Em Fri, 20 Mar 2020 12:59:18 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:

> Em Fri, 20 Mar 2020 12:24:45 +0100
> Federico Vaga <federico.vaga@...a.pv.it> escreveu:
> 
> > On Friday, March 20, 2020 12:12:35 PM CET Mauro Carvalho Chehab wrote:
> > > The autosectionlabel extension is nice, as it allows to refer to
> > > a section by its name without requiring any extra tag to create
> > > a reference name.
> > > 
> > > However, on its default, it has two serious problems:
> > > 
> > > 1) the namespace is global. So, two files with different
> > >    "introduction" section would create a label with the
> > >    same name. This is easily solvable by forcing the extension
> > >    to prepend the file name with:
> > > 
> > > 	autosectionlabel_prefix_document = True
> > > 
> > > 2) It doesn't work hierarchically. So, if there are two level 1
> > >    sessions (let's say, one labeled "open" and another one "ioctl")
> > >    and both have a level 2 "synopsis" label, both section 2 will
> > >    have the same identical name.
> > > 
> > >    Currently, there's no way to tell Sphinx to create an
> > >    hierarchical reference like:
> > > 
> > > 		open / synopsis
> > > 		ioctl / synopsis
> > > 
> > >   This causes around 800 warnings. So, the fix should be to
> > >   not let autosectionlabel to produce references for anything
> > >   that it is not at level one, with:
> > > 
> > > 	autosectionlabel_maxdepth = 1  
> > 
> > So, for level 1 headers is fine to use autosectionlabel, but if we want to 
> > refer to level 2,3... we have to create labels manually.
> 
> Yes.

Hmm... actually no. maxdepth = 1 will only get the title of each
document.

It should be at least maxdepth = 2, but this is producing some warnings
here (part on some new patches I wrote, that aren't upstream yet).

I'll run some tests and send a new version of this patch.


> 
> If we want to use it for other levels, the autosectionlabel extension
> would need to be modified to work on an hierarchical way, creating an
> unique label that would contain the entire hierarchy, starting from
> the filename.
> 
> Also, ideally, it should also handle cross-reference locally, searching
> first for a reference at the same hierarchical level, then at level - 1
> and so on.
> 
> I suspect that, even with that, we may still have some troubles, as
> right now some files may have explicitly defined a reference like
> that, but those would likely be easy to fix.
> 
> Thanks,
> Mauro



Thanks,
Mauro