Compile .po files into .mo files.

This plugin adds build_mo, clean_mo and install_mo subcommands for setup.py as well as hooking those into standard commands.

By default, setuptools_gettext compiles and installs mo files when there is a po directory present that contains .po files. It also supports the standard gettext layout with locale/*/LC_MESSAGES/*.po files. If po is absent and a top-level locale directory contains standard gettext catalogs, that directory is used automatically.

By default, the install_mo command installs compiled catalogs under share/locale to preserve compatibility with earlier releases. Django apps and other packages that load catalogs from package data can opt into package installation with install_layout = "package".

You can override these settings in pyproject.toml:

[build-system]
requires = ["setuptools", "setuptools-gettext"]
...

[tool.setuptools-gettext]
# directory in which the .po files can be found 
source_dir = "po"
# directory in which the generated .mo files are placed when building
build_dir = "breezy/locale"
# compiler to use: "auto", "msgfmt", or "translate-toolkit"
compiler = "auto"
# install compiled catalogs below share/locale or inside a package
install_layout = "share"

For standard gettext layouts, point both directories at the locale tree:

[tool.setuptools-gettext]
source_dir = "breezy/locale"
build_dir = "breezy/locale"

Flat po/de.po files compile to <build_dir>/de/LC_MESSAGES/<project-name>.mo by default. Standard locale/de/LC_MESSAGES/django.po files compile to <build_dir>/de/LC_MESSAGES/django.mo by default. Passing --output-base overrides the output name for both layouts.

For Django apps, keep the locale directory inside the app package and use the package install layout:

[tool.setuptools-gettext]
source_dir = "myapp/locale"
build_dir = "myapp/locale"
install_layout = "package"

With this configuration, myapp/locale/de/LC_MESSAGES/django.po compiles to myapp/locale/de/LC_MESSAGES/django.mo and is included as package data when building the package.

By default, either msgfmt or the translate-toolkit package is used to compile the .po files into .mo files - whichever is available.

Set compiler = "msgfmt" or compiler = "translate-toolkit" in [tool.setuptools-gettext] to force a compiler from pyproject.toml. Use compiler = "auto" to keep the default automatic detection.

The --msgfmt option can be used to force the use of msgfmt, and the --translate-toolkit option can be used to force the use of the translate-toolkit. Command line options take precedence over the pyproject.toml setting.

At the moment, msgfmt is preferred. In the future, the translate-toolkit will become the default.

You can use the translate-toolkit extra to install the translate-toolkit package.