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from __future__ import annotations
import warnings
from . import __version__
def deprecate(
deprecated: str,
when: int | None,
replacement: str | None = None,
*,
action: str | None = None,
plural: bool = False,
) -> None:
"""
Deprecations helper.
:param deprecated: Name of thing to be deprecated.
:param when: Pillow major version to be removed in.
:param replacement: Name of replacement.
:param action: Instead of "replacement", give a custom call to action
e.g. "Upgrade to new thing".
:param plural: if the deprecated thing is plural, needing "are" instead of "is".
Usually of the form:
"[deprecated] is deprecated and will be removed in Pillow [when] (yyyy-mm-dd).
Use [replacement] instead."
You can leave out the replacement sentence:
"[deprecated] is deprecated and will be removed in Pillow [when] (yyyy-mm-dd)"
Or with another call to action:
"[deprecated] is deprecated and will be removed in Pillow [when] (yyyy-mm-dd).
[action]."
"""
is_ = "are" if plural else "is"
if when is None:
removed = "a future version"
elif when <= int(__version__.split(".")[0]):
msg = f"{deprecated} {is_} deprecated and should be removed."
raise RuntimeError(msg)
elif when == 11:
removed = "Pillow 11 (2024-10-15)"
elif when == 12:
removed = "Pillow 12 (2025-10-15)"
else:
msg = f"Unknown removal version: {when}. Update {__name__}?"
raise ValueError(msg)
if replacement and action:
msg = "Use only one of 'replacement' and 'action'"
raise ValueError(msg)
if replacement:
action = f". Use {replacement} instead."
elif action:
action = f". {action.rstrip('.')}."
else:
action = ""
warnings.warn(
f"{deprecated} {is_} deprecated and will be removed in {removed}{action}",
DeprecationWarning,
stacklevel=3,
)
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