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authorVegard Nossum <vegard.nossum@oracle.com>2023-12-15 13:37:01 +0100
committerJonathan Corbet <corbet@lwn.net>2023-12-19 14:34:59 -0700
commit7418ec5b151f5591f750d57705cbb633c084a434 (patch)
treeb71cbd2cafa0603546979d7cf205423dea8f3a51 /Documentation/sphinx
parentdcd39fa2be95efd5cbce74661151f68510cb67fe (diff)
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 <federico.vaga@vaga.pv.it> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Akira Yokosawa <akiyks@gmail.com> Cc: Yanteng Si <siyanteng@loongson.cn> Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20231215123701.2712807-1-vegard.nossum@oracle.com
Diffstat (limited to 'Documentation/sphinx')
-rw-r--r--Documentation/sphinx/templates/translations.html15
-rw-r--r--Documentation/sphinx/translations.py101
2 files changed, 116 insertions, 0 deletions
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 @@
+<!-- SPDX-License-Identifier: GPL-2.0 -->
+<!-- Copyright © 2023, Oracle and/or its affiliates. -->
+
+{# Create a language menu for translations #}
+{% if languages|length > 0: %}
+<div class="language-selection">
+{{ current_language }}
+
+<ul>
+{% for ref in languages: %}
+<li><a href="{{ ref.refuri }}">{{ ref.astext() }}</a></li>
+{% endfor %}
+</ul>
+</div>
+{% 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 <vegard.nossum@oracle.com>
+#
+# 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,
+ }