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Merge pull request #2678 from Textualize/fileno
robust handling of fileno
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,24 @@ | ||
from __future__ import annotations | ||
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from typing import IO, Callable | ||
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def get_fileno(file_like: IO[str]) -> int | None: | ||
"""Get fileno() from a file, accounting for poorly implemented file-like objects. | ||
Args: | ||
file_like (IO): A file-like object. | ||
Returns: | ||
int | None: The result of fileno if available, or None if operation failed. | ||
""" | ||
fileno: Callable[[], int] | None = getattr(file_like, "fileno", None) | ||
if fileno is not None: | ||
try: | ||
return fileno() | ||
except Exception: | ||
# `fileno` is documented as potentially raising a OSError | ||
# Alas, from the issues, there are so many poorly implemented file-like objects, | ||
# that `fileno()` can raise just about anything. | ||
return None | ||
return None |
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Original file line number | Diff line number | Diff line change |
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from rich._fileno import get_fileno | ||
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def test_get_fileno(): | ||
class FileLike: | ||
def fileno(self) -> int: | ||
return 123 | ||
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assert get_fileno(FileLike()) == 123 | ||
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def test_get_fileno_missing(): | ||
class FileLike: | ||
pass | ||
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assert get_fileno(FileLike()) is None | ||
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def test_get_fileno_broken(): | ||
class FileLike: | ||
def fileno(self) -> int: | ||
1 / 0 | ||
return 123 | ||
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assert get_fileno(FileLike()) is None |