98 lines
3.9 KiB
Python
98 lines
3.9 KiB
Python
import gettext
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from contextlib import contextmanager
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from gettext import GNUTranslations, NullTranslations
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from importlib import import_module
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from pathlib import Path
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from typing import Any, Iterator
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from jinja2 import pass_context
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from jinja2.environment import Environment
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from jinja2.loaders import FileSystemLoader
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from jinja2.runtime import Context as JinjaContext
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from jweb.content import Content
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_DEFAULT_LANGUAGE = "en"
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class Context:
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def __init__(self, root_directory: Path) -> None:
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self.__root_directory = root_directory
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self.__output_directory = root_directory / "build"
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self.__content_directory = root_directory / "content"
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self.__environment = Environment(
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loader=FileSystemLoader(searchpath=root_directory / "src"),
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)
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self.__translations: dict[str, GNUTranslations | NullTranslations] = {}
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self.__current_language: str | None = None
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self.add_filters(load=self.__load, write=self.__write)
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@property
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def current_language(self) -> str | None:
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return self.__current_language
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def add_filters(self, **filters: Any) -> None:
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self.__environment.filters.update(**filters)
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def load_extensions(self, *extensions: str) -> None:
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for extension in extensions:
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module = import_module(extension)
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module.load_extension(self)
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def load_translations(self, domain: str, locale_dir: str | Path, *languages: str) -> None:
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locale_dir = str(locale_dir)
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self.__environment.add_extension("jinja2.ext.i18n")
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self.__translations[_DEFAULT_LANGUAGE] = NullTranslations()
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for language in languages:
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self.__translations[language] = gettext.translation(
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domain, localedir=str(locale_dir), languages=[language]
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)
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@contextmanager
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def set_language(self, language: str) -> Iterator[None]:
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translation = self.__translations[language]
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old_language = self.__current_language
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self.__environment.install_gettext_translations(translation, newstyle=True) # type: ignore
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self.__current_language = language
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yield
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self.__current_language = old_language
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self.__environment.uninstall_gettext_translations(translation) # type: ignore
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def render(self, source: str, output: str | Path, **context: Any) -> None:
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if self.__translations:
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for language in self.__translations:
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with self.set_language(language):
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self.__render(source, self.__output_directory / language / output, **context)
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else:
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self.__render(source, self.__output_directory / output, **context)
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@pass_context
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def __load(self, context: JinjaContext, path: str | Path) -> Content:
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current_language = self.current_language
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if current_language:
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localized_path = self.__content_directory / current_language / path
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if not localized_path.exists():
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localized_path = self.__content_directory / _DEFAULT_LANGUAGE / path
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else:
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localized_path = self.__content_directory / path
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with localized_path.open("r", encoding="utf-8") as content_file:
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return Content(localized_path, content_file.read(), current_language)
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def __write(self, content: Content) -> Path:
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relative_path = content.path.relative_to(self.__content_directory)
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output_path = self.__output_directory / relative_path
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with output_path.open("w") as output_file:
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output_file.write(content.data)
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return Path(f"/{relative_path}")
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def __render(self, source: str, output_path: Path, **context: Any) -> None:
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output_path.parent.mkdir(exist_ok=True, parents=True)
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template = self.__environment.get_template(source)
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content = template.render(**context)
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with open(output_path, "w") as output_file:
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output_file.write(content)
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