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# -*- coding: utf-8 -*-
"""
Various utilities
Author: Gertjan van den Burg
"""
import hashlib
from typing import Iterable
from typing import Iterator
from typing import Tuple
from typing import TypeVar
from clevercsv._types import AnyPath
T = TypeVar("T")
def pairwise(iterable: Iterable[T]) -> Iterator[Tuple[T, T]]:
"s - > (s0, s1), (s1, s2), (s2, s3), ..."
a = iter(iterable)
b = iter(iterable)
next(b, None)
return zip(a, b)
def sha1sum(filename: AnyPath) -> str:
"""Compute the SHA1 checksum of a given file
Parameters
----------
filename : str
Path to a file
Returns
-------
checksum : str
The SHA1 checksum of the file contents.
"""
blocksize = 1 << 16
hasher = hashlib.sha1()
with open(filename, "rb") as fp:
buf = fp.read(blocksize)
while len(buf) > 0:
hasher.update(buf)
buf = fp.read(blocksize)
return hasher.hexdigest()
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