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util.py
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util.py
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import os
from settings import repoconfig, repohelp
def reverse_readline(filename, buf_size=8192):
# https://stackoverflow.com/a/23646049
"""a generator that returns the lines of a file in reverse order"""
with open(filename) as fh:
segment = None
offset = 0
fh.seek(0, os.SEEK_END)
file_size = remaining_size = fh.tell()
while remaining_size > 0:
offset = min(file_size, offset + buf_size)
fh.seek(file_size - offset)
buffer = fh.read(min(remaining_size, buf_size))
remaining_size -= buf_size
lines = buffer.split('\n')
# the first line of the buffer is probably not a complete line so
# we'll save it and append it to the last line of the next buffer
# we read
if segment is not None:
# if the previous chunk starts right from the beginning of line
# do not concact the segment to the last line of new chunk
# instead, yield the segment first
if buffer[-1] != '\n':
lines[-1] += segment
else:
yield segment
segment = lines[0]
for index in range(len(lines) - 1, 0, -1):
if len(lines[index]):
yield lines[index]
# Don't yield None if the file was empty
if segment is not None:
yield segment
def sizeof_fmt(num, suffix='B'):
# https://stackoverflow.com/a/1094933
for unit in ['', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi']:
if abs(num) < 1024.0:
return "%3.2f%s%s" % (num, unit, suffix)
num /= 1024.0
return "%.2f%s%s" % (num, 'Yi', suffix)
def isint(val):
try:
int(val)
return True
except ValueError:
return False
def mirror_config():
return {r: {**repoconfig[r], 'details': repohelp.get(r, '')} for r in sorted(repoconfig.keys())}