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Implement #3956 - initial coding hint support #3957

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Implement #3956 - initial coding hint support
clach04 Jun 14, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 14, 2026
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25 changes: 24 additions & 1 deletion codespell_lib/_codespell.py
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Original file line number Diff line number Diff line change
Expand Up @@ -284,7 +284,30 @@ def open_with_internal(
) -> tuple[list[tuple[bool, int, list[str]]], str]:
encoding = None
first_try = True
for encoding in ("utf-8", "iso-8859-1"):
encoding_try_list = ["utf-8", "iso-8859-1"]
with open(filename, "rb") as f:
encoding_marker = b"-*- coding:"
for line_number in range(3):
sniff_line = f.readline()
if encoding_marker not in sniff_line:
continue
sniff_encoding = sniff_line[
sniff_line.find(encoding_marker) + len(encoding_marker) :
]
sniff_encoding = sniff_encoding.strip()
if sniff_encoding:
sniff_encoding = sniff_encoding[
: sniff_encoding.find(b" ")
] # do we need to handle newlines?
if sniff_encoding:
sniff_encoding_str = sniff_encoding.decode("us-ascii")
try:
"".encode(sniff_encoding_str) # Attempt to validate encoding
except LookupError:
sniff_encoding_str = sniff_encoding_str.replace("-", "")
encoding_try_list.insert(0, sniff_encoding_str)
break
for encoding in encoding_try_list:
if first_try:
first_try = False
elif not self.quiet_level & QuietLevels.ENCODING:
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