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54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
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import argparse
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from typing import Any, Callable, Generic, Iterator, Iterable, Optional, TypeVar
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T = TypeVar('T')
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class LazyChoices(argparse.Action, Generic[T]):
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def __init__(
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self,
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*args,
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getter: Callable[[], Iterable[T]],
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help_formatter: Optional[Callable[[T], str]] = None,
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sort: bool = False,
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cache: bool = True,
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**kwargs
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) -> None:
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self.getter = getter
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self.help_formatter = help_formatter
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self.sort = sort
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self.cache = cache
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self._help: Optional[str] = None
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self._obj: Optional[Iterable[T]] = None
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super().__init__(*args, **kwargs)
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self.choices = self
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def load(self) -> T:
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if self._obj is None or not self.cache:
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self._obj = self.getter()
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assert self._obj is not None
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return self._obj
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@property
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def help(self) -> str:
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if self._help is None and self.help_formatter is not None:
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self._help = self.help_formatter(self.load())
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return self._help
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@help.setter
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def help(self, value: Any) -> None:
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self._help = value
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def __contains__(self, item: Any) -> bool:
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return item in self.load()
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def __iter__(self) -> Iterator[T]:
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if self.sort:
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return iter(sorted(self.load()))
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else:
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return iter(self.load())
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def __call__(self, parser, namespace, values, option_string=None):
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setattr(namespace, self.dest, values)
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