BUG: adjust to older pyproject-metadata releases

mesonpy/__init__.py

@@ -78,6 +78,7 @@ def canonicalize_license_expression(s: str) -> str:
 
 __version__ = '0.17.0.dev0'
 
+_PYPROJECT_METADATA_VERSION = tuple(map(int, pyproject_metadata.__version__.split('.')[:2]))
 
 _NINJA_REQUIRED_VERSION = '1.8.2'
 _MESON_REQUIRED_VERSION = '0.63.3' # keep in sync with the version requirement in pyproject.toml
@@ -244,6 +245,9 @@ class MesonBuilderError(Error):
 
 class Metadata(pyproject_metadata.StandardMetadata):
  def __init__(self, name: str, *args: Any, **kwargs: Any):
+ if _PYPROJECT_METADATA_VERSION < (0, 9):
+ kwargs.pop('license', None)
+ kwargs.pop('license_files', None)
  super().__init__(name, *args, **kwargs)
  # Local fix for https:/FFY00/python-pyproject-metadata/issues/60
  self.name = self._validate_name(name)
@@ -758,7 +762,12 @@ def __init__(
  if license is None:
  raise pyproject_metadata.ConfigurationError(
  'Field "license" declared as dynamic but license is not specified in meson.build')
- self._metadata.license = license
+ # mypy is not happy when analyzing typing based on
+ # pyproject-metadata < 0.9 where license needs to be of
+ # License type. However, this code is not executed if
+ # pyproject-metadata is older than 0.9 because then dynamic
+ # license is not allowed.
+ self._metadata.license = license # type: ignore[assignment]
  if 'license-files' in self._metadata.dynamic:
  self._metadata.license_files = self._meson_license_files
  else:
@@ -908,7 +917,7 @@ def _meson_license(self) -> Optional[str]:
  assert isinstance(value, str)
  if value == 'unknown':
  return None
- return canonicalize_license_expression(value)
+ return str(canonicalize_license_expression(value)) # str() is to make mypy happy
 
  @property
  def _meson_license_files(self) -> List[pathlib.Path]: