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"""Utilities for Sphinx extensions."""
from typing import TYPE_CHECKING, Any, Dict
from packaging.version import InvalidVersion, Version
from sphinx.config import Config
from sphinx.errors import VersionRequirementError
from sphinx.locale import __
from sphinx.util import logging
if TYPE_CHECKING:
from sphinx.application import Sphinx
logger = logging.getLogger(__name__)
class Extension:
def __init__(self, name: str, module: Any, **kwargs: Any) -> None:
self.name = name
self.module = module
self.metadata = kwargs
self.version = kwargs.pop('version', 'unknown version')
# The extension supports parallel read or not. The default value
# is ``None``. It means the extension does not tell the status.
# It will be warned on parallel reading.
self.parallel_read_safe = kwargs.pop('parallel_read_safe', None)
# The extension supports parallel write or not. The default value
# is ``True``. Sphinx writes parallelly documents even if
# the extension does not tell its status.
self.parallel_write_safe = kwargs.pop('parallel_write_safe', True)
def verify_needs_extensions(app: "Sphinx", config: Config) -> None:
"""Verify the required Sphinx extensions are loaded."""
if config.needs_extensions is None:
return
for extname, reqversion in config.needs_extensions.items():
extension = app.extensions.get(extname)
if extension is None:
logger.warning(__('The %s extension is required by needs_extensions settings, '
'but it is not loaded.'), extname)
continue
fulfilled = True
if extension.version == 'unknown version':
fulfilled = False
else:
try:
if Version(reqversion) > Version(extension.version):
fulfilled = False
except InvalidVersion:
if reqversion > extension.version:
fulfilled = False
if not fulfilled:
raise VersionRequirementError(__('This project needs the extension %s at least in '
'version %s and therefore cannot be built with '
'the loaded version (%s).') %
(extname, reqversion, extension.version))
def setup(app: "Sphinx") -> Dict[str, Any]:
app.connect('config-inited', verify_needs_extensions, priority=800)
return {
'version': 'builtin',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
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