FTL-Extract is a Python package that extracts Fluent keys from .py files and generates a .ftl file with extracted keys.

Use the package manager pip to install FTL-Extract.

$ pip install FTL-Extract

Or add it to your pyproject.toml and run poetry update

First of all, you should create locales directory in your project.

$ mkdir project_path/locales

Then, you can use the following command to extract keys from your code.

$ ftl_extract project_path/code_path project_path/locales

By default, FTL-Extract will create a directory named en and put all keys into _default.ftl file.

In more cases, you may want to extract keys to specific .ftl files. So, you must add _path argument to i18n.get function in your code.

# Before
i18n.get("key-1", arg1="value1", arg2="value2")

# After
i18n.get("key-1", arg1="value1", arg2="value2", _path="dir/ftl_file.ftl")

You just need to add _path argument to i18n.get function and specify the path to the .ftl file where you want to put the key.

It may be just a filename like file.ftl or a path to a file like dir/file.ftl.

i18n_middleware = I18nMiddleware(
    core=FluentRuntimeCore(path=Path(__file__).parent / "locales" / "{locale}"),
    manager=FSMManager(),
)

class CustomFluentRuntimeCore(FluentRuntimeCore):
    def get(self, message_id: str, locale: Optional[str] = None, /, **kwargs: Any) -> str:

    # PATCH START #
    kwargs.pop("_path", None)
    # PATCH END #

    locale = self.get_locale(locale=locale)
    translator: FluentBundle = self.get_translator(locale=locale)
    ...

# Here we add 3 languages: English, Ukrainian and Polish
$ ftl_extract project_path/code_path project_path/locales -l en -l uk -l pl

# Here we extract ftl keys from i18n-keys like `i18n`, `LF`, `LazyProxy` and `L`
$ ftl_extract project_path/code_path project_path/locales -k i18n -k LF -k LazyProxy -k L

$ ftl_extract \
  './app/bot' \
  './app/bot/locales' \
  -l 'en' \
  -l 'uk' \
  -l 'pl' \
  -l 'de' \
  -l 'ja' \
  -l 'ru' \
  -k 'i18n' \
  -k 'L' \
  -k 'LF' \
  -k 'LazyProxy' \
  -a 'core' \
  --comment-junks

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.