From 7418ec5b151f5591f750d57705cbb633c084a434 Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Fri, 15 Dec 2023 13:37:01 +0100 Subject: [PATCH] docs: translations: add translations links when they exist Add a new Sphinx extension that knows about the translations of kernel documentation and can insert links to the translations at the top of the document. It basically works like this: 1. Register a new node type, LanguagesNode. 2. Register a new transform, TranslationsTransform, that inserts a new LanguageNode at the top of every document. The LanguageNode contains "pending references" to translations of the document. The key here is that these are pending (i.e. unresolved) references that may or may not actually exist. 3. Register a 'doctree-resolved' event that iterates over all the LanguageNode nodes. Any unresolved references are filtered out; the list of resolved references is passed to the 'translations.html' template and rendered as an HTML node (if HTML output is selected). Testing: make htmldocs, make latexdocs with Sphinx v4.3.2 and Firefox. v2: - changed bar into a drop-down menu - fixed language labels - fixed hysteresis reported by Akira Yokosawa Cc: Federico Vaga Cc: Jani Nikula Cc: Akira Yokosawa Cc: Yanteng Si Signed-off-by: Vegard Nossum Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20231215123701.2712807-1-vegard.nossum@oracle.com --- Documentation/conf.py | 2 +- Documentation/sphinx-static/custom.css | 53 +++++++++ .../sphinx/templates/translations.html | 15 +++ Documentation/sphinx/translations.py | 101 ++++++++++++++++++ 4 files changed, 170 insertions(+), 1 deletion(-) create mode 100644 Documentation/sphinx/templates/translations.html create mode 100644 Documentation/sphinx/translations.py diff --git a/Documentation/conf.py b/Documentation/conf.py index a3d1fe9dfcf9..5830b01c5642 100644 --- a/Documentation/conf.py +++ b/Documentation/conf.py @@ -55,7 +55,7 @@ needs_sphinx = '2.4.4' extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'kfigure', 'sphinx.ext.ifconfig', 'automarkup', 'maintainers_include', 'sphinx.ext.autosectionlabel', - 'kernel_abi', 'kernel_feat'] + 'kernel_abi', 'kernel_feat', 'translations'] if major >= 3: if (major > 3) or (minor > 0 or patch >= 2): diff --git a/Documentation/sphinx-static/custom.css b/Documentation/sphinx-static/custom.css index a88ef12428fa..f4285417c71a 100644 --- a/Documentation/sphinx-static/custom.css +++ b/Documentation/sphinx-static/custom.css @@ -83,3 +83,56 @@ input.kernel-toc-toggle { display: none; } h3.kernel-toc-contents { display: inline; } div.kerneltoc a { color: black; } } + +/* Language selection menu */ + +div.admonition { + /* + * Make sure we don't overlap notes and warnings at the top of the + * document. + */ + clear: both; +} + +div.language-selection { + background: #eeeeee; + border: 1px solid #cccccc; + margin-bottom: 1em; + padding: .5em; + + position: relative; + float: right; +} + +div.language-selection a { + display: block; + padding: 0.5em; + color: #333333; + text-decoration: none; +} + +div.language-selection ul { + display: none; + position: absolute; + + /* Align with the parent div */ + top: 100%; + right: 0; + margin: 0; + + list-style: none; + + background: #fafafa; + border: 1px solid #cccccc; + + /* Never break menu item lines */ + white-space: nowrap; +} + +div.language-selection:hover ul { + display: block; +} + +div.language-selection ul li:hover { + background: #dddddd; +} diff --git a/Documentation/sphinx/templates/translations.html b/Documentation/sphinx/templates/translations.html new file mode 100644 index 000000000000..8df5d42d8dcd --- /dev/null +++ b/Documentation/sphinx/templates/translations.html @@ -0,0 +1,15 @@ + + + +{# Create a language menu for translations #} +{% if languages|length > 0: %} +
+{{ current_language }} + + +
+{% endif %} diff --git a/Documentation/sphinx/translations.py b/Documentation/sphinx/translations.py new file mode 100644 index 000000000000..47161e6eba99 --- /dev/null +++ b/Documentation/sphinx/translations.py @@ -0,0 +1,101 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright © 2023, Oracle and/or its affiliates. +# Author: Vegard Nossum +# +# Add translation links to the top of the document. +# + +import os + +from docutils import nodes +from docutils.transforms import Transform + +import sphinx +from sphinx import addnodes +from sphinx.errors import NoUri + +all_languages = { + # English is always first + None: 'English', + + # Keep the rest sorted alphabetically + 'zh_CN': 'Chinese (Simplified)', + 'zh_TW': 'Chinese (Traditional)', + 'it_IT': 'Italian', + 'ja_JP': 'Japanese', + 'ko_KR': 'Korean', + 'sp_SP': 'Spanish', +} + +class LanguagesNode(nodes.Element): + def __init__(self, current_language, *args, **kwargs): + super().__init__(*args, **kwargs) + + self.current_language = current_language + +class TranslationsTransform(Transform): + default_priority = 900 + + def apply(self): + app = self.document.settings.env.app + docname = self.document.settings.env.docname + + this_lang_code = None + components = docname.split(os.sep) + if components[0] == 'translations' and len(components) > 2: + this_lang_code = components[1] + + # normalize docname to be the untranslated one + docname = os.path.join(*components[2:]) + + new_nodes = LanguagesNode(all_languages[this_lang_code]) + + for lang_code, lang_name in all_languages.items(): + if lang_code == this_lang_code: + continue + + if lang_code is None: + target_name = docname + else: + target_name = os.path.join('translations', lang_code, docname) + + pxref = addnodes.pending_xref('', refdomain='std', + reftype='doc', reftarget='/' + target_name, modname=None, + classname=None, refexplicit=True) + pxref += nodes.Text(lang_name) + new_nodes += pxref + + self.document.insert(0, new_nodes) + +def process_languages(app, doctree, docname): + for node in doctree.traverse(LanguagesNode): + if app.builder.format not in ['html']: + node.parent.remove(node) + continue + + languages = [] + + # Iterate over the child nodes; any resolved links will have + # the type 'nodes.reference', while unresolved links will be + # type 'nodes.Text'. + languages = list(filter(lambda xref: + isinstance(xref, nodes.reference), node.children)) + + html_content = app.builder.templates.render('translations.html', + context={ + 'current_language': node.current_language, + 'languages': languages, + }) + + node.replace_self(nodes.raw('', html_content, format='html')) + +def setup(app): + app.add_node(LanguagesNode) + app.add_transform(TranslationsTransform) + app.connect('doctree-resolved', process_languages) + + return { + 'parallel_read_safe': True, + 'parallel_write_safe': True, + }