Re: [dpdk-dev] [PATCH] doc: support building HTML guides with meson

[Luca Boccassi <bluca@debian.org>]

On Tue, 2018-09-11 at 21:36 +0100, Luca Boccassi wrote:
> On Tue, 2018-09-11 at 17:13 +0100, Bruce Richardson wrote:
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> > ---
> > NOTE: this patch depends upon:
> > http://patches.dpdk.org/project/dpdk/list/?series=1232
> 
> Just a reminder that's v2, and the patch won't apply cleanly on the
> latest revision
> 
> >  doc/api/meson.build    |  3 ++-
> >  doc/guides/meson.build | 16 ++++++++++++++++
> >  doc/meson.build        | 11 +++++++++++
> >  3 files changed, 29 insertions(+), 1 deletion(-)
> >  create mode 100644 doc/guides/meson.build
> > 
> > diff --git a/doc/api/meson.build b/doc/api/meson.build
> > index 5dfa0fe04..f9bee4dac 100644
> > --- a/doc/api/meson.build
> > +++ b/doc/api/meson.build
> > @@ -50,5 +50,6 @@ if doxygen.found()
> >  		install_dir: htmldir,
> >  		build_by_default: false)
> >  
> > -	run_target('doc', command: 'true', depends: doxy_build)
> > +	doc_targets += doxy_build
> > +	doc_target_names += 'Doxygen_API'
> >  endif
> > diff --git a/doc/guides/meson.build b/doc/guides/meson.build
> > new file mode 100644
> > index 000000000..6d1e2990d
> > --- /dev/null
> > +++ b/doc/guides/meson.build
> > @@ -0,0 +1,16 @@
> > +# SPDX-License-Identifier: BSD-3-Clause
> > +# Copyright(c) 2017 Intel Corporation
> 
> s/2017/2018
> 
> > +sphinx = find_program('sphinx-build', required:
> > get_option('enable_docs'))
> > +
> > +if sphinx.found()
> > +	html_guides_build = custom_target('html_guides_build',
> > +		input: meson.current_source_dir(),
> > +		output: 'index.html',
> 
> As we discussed I don't have a good solution, but right now running
> ninja will rebuild these sphinx docs again and again, which will be a
> bit annoying when using enable_docs=true as it will always happen.
> Changing output to 'html' fixes the issue and it makes it build only
> once, but then they won't rebuild if the docs change as you noted.
> 
> > +		command: [sphinx, '-b', 'html', '@INPUT@',
> > meson.current_build_dir() + '/html'],
> > +		build_by_default: false,
> > +		install: get_option('enable_docs'))
> > +
> > +	doc_targets += html_guides_build
> > +	doc_target_names += 'HTML_Guides'
> > +endif
> > diff --git a/doc/meson.build b/doc/meson.build
> > index afca2e713..c5410d85d 100644
> > --- a/doc/meson.build
> > +++ b/doc/meson.build
> > @@ -1,4 +1,15 @@
> >  # SPDX-License-Identifier: BSD-3-Clause
> >  # Copyright(c) 2018 Luca Boccassi <bluca@debian.org>
> >  
> > +doc_targets = []
> > +doc_target_names = []
> >  subdir('api')
> > +subdir('guides')
> > +
> > +if doc_targets.length() == 0
> > +	message = 'No docs targets found'
> > +else
> > +	message = 'Building docs:'
> > +endif
> > +run_target('doc', command: ['echo', message, doc_target_names],
> > +	depends: doc_targets)
> 
> One thing that's missing is the install_dir, without which ninja
> install doesn't work (actually errors out for the whole tree).
> 
> To keep the install the same as the legacy makefiles this diff is
> needed (I need to change the outdir in the doxygen stuff too, v5
> coming) (in the build dir it will be slightly awkward as it's
> build/doc/guides/guides and build/doc/api/api, but I can't find
> another
> way to get it to work and install in the expected directories):
> 
> --- a/doc/guides/meson.build
> +++ b/doc/guides/meson.build
> @@ -4,12 +4,14 @@
>  sphinx = find_program('sphinx-build', required:
> get_option('enable_docs'))
>  
>  if sphinx.found()
> +       htmldir = join_paths('share', 'doc', 'dpdk')
>         html_guides_build = custom_target('html_guides_build',
>                 input: meson.current_source_dir(),
> -               output: 'index.html',
> -               command: [sphinx, '-b', 'html', '@INPUT@',
> meson.current_build_dir() + '/html'],
> +               output: 'guides',
> +               command: [sphinx, '-b', 'html', '@INPUT@',
> meson.current_build_dir() + '/guides'],
>                 build_by_default: false,
> -               install: get_option('enable_docs'))
> +               install: get_option('enable_docs'),
> +               install_dir: htmldir)
>  
>         doc_targets += html_guides_build
>         doc_target_names += 'HTML_Guides'

Couple more issues: I diffed the installed doc with ye olde make and
this one, and:

1) This one will install sphinx temporary cache files, which among
other things will screw up reproducible builds. It's easy to get rid of
the .doctrees by adding the following to the sphinx command:

 '-d', meson.current_build_dir() + '/.doctrees'

so that the doctrees are stored in the build directory, rather than in
the output directory, and so they will not be installed.
But the .buildinfo file, with some hashes (and so more reproducibility
problems) is still installed and I can't see how to get rid of it.

2) The custom.css file is installed manually by ye olde makefiles and
thus is missing from guides/_static/css/custom.css

-- 
Kind regards,
Luca Boccassi