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

[Luca Boccassi <bluca@debian.org>]

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'
-- 
Kind regards,
Luca Boccassi