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"""
.. codeauthor:: Tsuyoshi Hombashi <[email protected]>
"""
import os
import stat
from errno import EBADF, ENOENT, ENOTDIR
from typing import Optional, Union
from ._binary_ext_checker import is_binary_ext_path
def is_fifo(file_path: Union[int, bytes, str]) -> bool:
try:
return stat.S_ISFIFO(os.stat(file_path).st_mode)
except OSError as e:
if e.errno not in (ENOENT, ENOTDIR, EBADF):
raise
return False
except ValueError:
return False
def to_codec_name(name: Optional[str]) -> Optional[str]:
if not name:
return None
return name.lower().replace("-", "_")
def detect_file_encoding(file_path) -> Optional[str]:
from chardet.universaldetector import UniversalDetector
if not os.path.isfile(file_path) or is_binary_ext_path(file_path) or is_fifo(file_path):
return None
detector = UniversalDetector()
READ_SIZE = 4 * 1024
try:
with open(file_path, mode="rb") as f:
while True:
binary = f.read(READ_SIZE)
if not binary:
break
detector.feed(binary)
if detector.done:
break
except OSError:
return None
finally:
detector.close()
return to_codec_name(detector.result.get("encoding"))
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