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.. _i18n-api:
i18n API
========
.. currentmodule:: sphinx.locale
.. autofunction:: init
.. autofunction:: init_console
.. autofunction:: get_translation
.. autofunction:: _
.. autofunction:: __
.. _ext-i18n:
Extension internationalization (``i18n``) and localization (``l10n``) using i18n API
------------------------------------------------------------------------------------
.. versionadded:: 1.8
An extension may naturally come with message translations. This is briefly
summarized in :func:`sphinx.locale.get_translation` help.
In practice, you have to:
#. Choose a name for your message catalog, which must be unique. Usually
the name of your extension is used for the name of message catalog.
#. Mark in your extension sources all messages as translatable, via
:func:`sphinx.locale.get_translation` function, usually renamed ``_()``,
e.g.:
.. code-block:: python
:caption: src/__init__.py
from sphinx.locale import get_translation
MESSAGE_CATALOG_NAME = 'myextension'
_ = get_translation(MESSAGE_CATALOG_NAME)
translated_text = _('Hello Sphinx!')
#. Set up your extension to be aware of its dedicated translations:
.. code-block:: python
:caption: src/__init__.py
def setup(app):
package_dir = Path(__file__).resolve().parent
locale_dir = package_dir / 'locales'
app.add_message_catalog(MESSAGE_CATALOG_NAME, locale_dir)
#. Generate message catalog template ``*.pot`` file, usually in ``locale/``
source directory, for example via `Babel`_:
.. code-block:: console
$ pybabel extract --output=src/locale/myextension.pot src/
#. Create message catalogs (``*.po``) for each language which your extension
will provide localization, for example via `Babel`_:
.. code-block:: console
$ pybabel init --input-file=src/locale/myextension.pot --domain=myextension --output-dir=src/locale --locale=fr_FR
#. Translate message catalogs for each language manually
#. Compile message catalogs into ``*.mo`` files, for example via `Babel`_:
.. code-block:: console
$ pybabel compile --directory=src/locale --domain=myextension
#. Ensure that message catalog files are distributed when your package will
be installed, by adding equivalent line in your extension ``MANIFEST.in``:
.. code-block:: ini
:caption: MANIFEST.in
recursive-include src *.pot *.po *.mo
When the messages on your extension has been changed, you need to also update
message catalog template and message catalogs, for example via `Babel`_:
.. code-block:: console
$ pybabel extract --output=src/locale/myextension.pot src/
$ pybabel update --input-file=src/locale/myextension.pot --domain=myextension --output-dir=src/locale
.. _Babel: https://babel.pocoo.org/
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