[v9,5/5] dts: add API doc generation

Message ID 20240801091839.178306-6-juraj.linkes@pantheon.tech (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series dts: API docs generation |

Checks

Context Check Description
ci/checkpatch warning coding style issues
ci/loongarch-compilation success Compilation OK
ci/loongarch-unit-testing success Unit Testing PASS
ci/Intel-compilation fail Compilation issues
ci/intel-Testing fail Testing issues
ci/intel-Functional success Functional PASS

Commit Message

Juraj Linkeš Aug. 1, 2024, 9:18 a.m. UTC
The tool used to generate DTS API docs is Sphinx, which is already in
use in DPDK. The same configuration is used to preserve style with one
DTS-specific configuration (so that the DPDK docs are unchanged) that
modifies how the sidebar displays the content.

Sphinx generates the documentation from Python docstrings. The docstring
format is the Google format [0] which requires the sphinx.ext.napoleon
extension. The other extension, sphinx.ext.intersphinx, enables linking
to objects in external documentations, such as the Python documentation.

There are two requirements for building DTS docs:
* The same Python version as DTS or higher, because Sphinx imports the
  code.
* Also the same Python packages as DTS, for the same reason.

[0] https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings

Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
Reviewed-by: Luca Vizzarro <luca.vizzarro@arm.com>
Reviewed-by: Jeremy Spewock <jspewock@iol.unh.edu>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Tested-by: Luca Vizzarro <luca.vizzarro@arm.com>
Tested-by: Nicholas Pratte <npratte@iol.unh.edu>
---
 buildtools/call-sphinx-build.py |  3 +++
 doc/api/doxy-api-index.md       |  3 +++
 doc/api/doxy-api.conf.in        |  2 ++
 doc/api/meson.build             |  4 ++++
 doc/guides/conf.py              | 33 +++++++++++++++++++++++++++++++-
 doc/guides/meson.build          |  1 +
 doc/guides/tools/dts.rst        | 34 ++++++++++++++++++++++++++++++++-
 dts/doc/meson.build             | 27 ++++++++++++++++++++++++++
 dts/meson.build                 | 16 ++++++++++++++++
 meson.build                     |  1 +
 10 files changed, 122 insertions(+), 2 deletions(-)
 create mode 100644 dts/doc/meson.build
 create mode 100644 dts/meson.build
  

Patch

diff --git a/buildtools/call-sphinx-build.py b/buildtools/call-sphinx-build.py
index 2034160049..102f496599 100755
--- a/buildtools/call-sphinx-build.py
+++ b/buildtools/call-sphinx-build.py
@@ -16,10 +16,13 @@ 
 parser.add_argument('version')
 parser.add_argument('src')
 parser.add_argument('dst')
+parser.add_argument('--dts-root', default=None)
 args, extra_args = parser.parse_known_args()
 
 # set the version in environment for sphinx to pick up
 os.environ['DPDK_VERSION'] = args.version
+if args.dts_root:
+    os.environ['DTS_ROOT'] = args.dts_root
 
 sphinx_cmd = [args.sphinx] + extra_args
 
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index f9f0300126..ab223bcdf7 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -245,3 +245,6 @@  The public API headers are grouped by topics:
   [experimental APIs](@ref rte_compat.h),
   [ABI versioning](@ref rte_function_versioning.h),
   [version](@ref rte_version.h)
+
+- **tests**:
+  [**DTS**](@dts_api_main_page)
diff --git a/doc/api/doxy-api.conf.in b/doc/api/doxy-api.conf.in
index a8823c046f..c94f02d411 100644
--- a/doc/api/doxy-api.conf.in
+++ b/doc/api/doxy-api.conf.in
@@ -124,6 +124,8 @@  SEARCHENGINE            = YES
 SORT_MEMBER_DOCS        = NO
 SOURCE_BROWSER          = YES
 
+ALIASES                 = "dts_api_main_page=@DTS_API_MAIN_PAGE@"
+
 EXAMPLE_PATH            = @TOPDIR@/examples
 EXAMPLE_PATTERNS        = *.c
 EXAMPLE_RECURSIVE       = YES
diff --git a/doc/api/meson.build b/doc/api/meson.build
index b828b1ed66..ffc75d7b5a 100644
--- a/doc/api/meson.build
+++ b/doc/api/meson.build
@@ -41,6 +41,10 @@  cdata.set('WARN_AS_ERROR', 'NO')
 if get_option('werror')
     cdata.set('WARN_AS_ERROR', 'YES')
 endif
+# A local reference must be relative to the main index.html page
+# The path below can't be taken from the DTS meson file as that would
+# require recursive subdir traversal (doc, dts, then doc again)
+cdata.set('DTS_API_MAIN_PAGE', join_paths('..', 'dts', 'html', 'index.html'))
 
 # configure HTML Doxygen run
 html_cdata = configuration_data()
diff --git a/doc/guides/conf.py b/doc/guides/conf.py
index 8b440fb2a9..b442a1f76c 100644
--- a/doc/guides/conf.py
+++ b/doc/guides/conf.py
@@ -9,7 +9,7 @@ 
 from os import environ
 from os.path import basename, dirname
 from os.path import join as path_join
-from sys import argv, stderr
+from sys import argv, stderr, path
 
 import configparser
 
@@ -23,6 +23,37 @@ 
           file=stderr)
     pass
 
+# Napoleon enables the Google format of Python doscstrings, used in DTS
+# Intersphinx allows linking to external projects, such as Python docs, also used in DTS
+extensions = ['sphinx.ext.napoleon', 'sphinx.ext.intersphinx']
+
+# DTS Python docstring options
+autodoc_default_options = {
+    'members': True,
+    'member-order': 'bysource',
+    'show-inheritance': True,
+}
+autodoc_class_signature = 'separated'
+autodoc_typehints = 'both'
+autodoc_typehints_format = 'short'
+autodoc_typehints_description_target = 'documented'
+napoleon_numpy_docstring = False
+napoleon_attr_annotations = True
+napoleon_preprocess_types = True
+add_module_names = False
+toc_object_entries = True
+toc_object_entries_show_parents = 'hide'
+intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}
+
+dts_root = environ.get('DTS_ROOT')
+if dts_root:
+    path.append(dts_root)
+    # DTS Sidebar config
+    html_theme_options = {
+        'collapse_navigation': False,
+        'navigation_depth': -1,
+    }
+
 stop_on_error = ('-W' in argv)
 
 project = 'Data Plane Development Kit'
diff --git a/doc/guides/meson.build b/doc/guides/meson.build
index f8bbfba9f5..b34b7b8eb0 100644
--- a/doc/guides/meson.build
+++ b/doc/guides/meson.build
@@ -1,6 +1,7 @@ 
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
+doc_guides_source_dir = meson.current_source_dir()
 sphinx = find_program('sphinx-build', required: get_option('enable_docs'))
 
 if not sphinx.found()
diff --git a/doc/guides/tools/dts.rst b/doc/guides/tools/dts.rst
index 515b15e4d8..77df7a0378 100644
--- a/doc/guides/tools/dts.rst
+++ b/doc/guides/tools/dts.rst
@@ -292,7 +292,12 @@  and try not to divert much from it.
 The :ref:`DTS developer tools <dts_dev_tools>` will issue warnings
 when some of the basics are not met.
 
-The code must be properly documented with docstrings.
+The API documentation, which is a helpful reference when developing, may be accessed
+in the code directly or generated with the :ref:`API docs build steps <building_api_docs>`.
+When adding new files or modifying the directory structure,
+the corresponding changes must be made to DTS api doc sources in ``dts/doc``.
+
+Speaking of which, the code must be properly documented with docstrings.
 The style must conform to the `Google style
 <https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings>`_.
 See an example of the style `here
@@ -427,6 +432,33 @@  the DTS code check and format script.
 Refer to the script for usage: ``devtools/dts-check-format.sh -h``.
 
 
+.. _building_api_docs:
+
+Building DTS API docs
+---------------------
+
+To build DTS API docs, install the dependencies with Poetry, then enter its shell:
+
+.. code-block:: console
+
+   poetry install --no-root --with docs
+   poetry shell
+
+The documentation is built using the standard DPDK build system.
+After executing the meson command and entering Poetry's shell, build the documentation with:
+
+.. code-block:: console
+
+   ninja -C build dts-doc
+
+The output is generated in ``build/doc/api/dts/html``.
+
+.. Note::
+
+   Make sure to fix any Sphinx warnings when adding or updating docstrings,
+   and also run the ``devtools/dts-check-format.sh`` script and address any issues it finds.
+
+
 Configuration Schema
 --------------------
 
diff --git a/dts/doc/meson.build b/dts/doc/meson.build
new file mode 100644
index 0000000000..01b7b51034
--- /dev/null
+++ b/dts/doc/meson.build
@@ -0,0 +1,27 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2023 PANTHEON.tech s.r.o.
+
+sphinx = find_program('sphinx-build', required: false)
+sphinx_apidoc = find_program('sphinx-apidoc', required: false)
+
+if not sphinx.found() or not sphinx_apidoc.found()
+    subdir_done()
+endif
+
+dts_doc_api_build_dir = join_paths(doc_api_build_dir, 'dts')
+
+extra_sphinx_args = ['-E', '-c', doc_guides_source_dir, '--dts-root', dts_dir]
+if get_option('werror')
+    extra_sphinx_args += '-W'
+endif
+
+htmldir = join_paths(get_option('datadir'), 'doc', 'dpdk', 'dts')
+dts_api_html = custom_target('dts_api_html',
+        output: 'html',
+        command: [sphinx_wrapper, sphinx, meson.project_version(),
+            meson.current_source_dir(), dts_doc_api_build_dir, extra_sphinx_args],
+        build_by_default: false,
+        install: get_option('enable_docs'),
+        install_dir: htmldir)
+doc_targets += dts_api_html
+doc_target_names += 'DTS_API_HTML'
diff --git a/dts/meson.build b/dts/meson.build
new file mode 100644
index 0000000000..e8ce0f06ac
--- /dev/null
+++ b/dts/meson.build
@@ -0,0 +1,16 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2023 PANTHEON.tech s.r.o.
+
+doc_targets = []
+doc_target_names = []
+dts_dir = meson.current_source_dir()
+
+subdir('doc')
+
+if doc_targets.length() == 0
+    message = 'No docs targets found'
+else
+    message = 'Built docs:'
+endif
+run_target('dts-doc', command: [echo, message, doc_target_names],
+    depends: doc_targets)
diff --git a/meson.build b/meson.build
index 8b248d4505..835973a0ce 100644
--- a/meson.build
+++ b/meson.build
@@ -87,6 +87,7 @@  subdir('app')
 
 # build docs
 subdir('doc')
+subdir('dts')
 
 # build any examples explicitly requested - useful for developers - and
 # install any example code into the appropriate install path