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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Helper for checking whitespace.
These operations aren't easy to do in pure shell.
"""
from __future__ import print_function
import sys
def check(path):
with open(path, 'rb') as fp:
# Skip 0 byte files.
first_byte = fp.read(1)
if not first_byte:
return 0
# Check for leading blank lines.
if b'\n' == first_byte:
print('%s: trim leading blank lines' % (path,), file=sys.stderr)
return 1
# Check for missing trailing new line.
fp.seek(-1, 2)
if b'\n' != fp.read(1):
print('%s: missing trailing new line' % (path,), file=sys.stderr)
return 1
elif fp.tell() == 1:
print('%s: dummy file' % (path,), file=sys.stderr)
return 1
# Check for trailing blank lines.
fp.seek(-2, 2)
if b'\n\n' == fp.read(2):
print('%s: trim trailing blank lines' % (path,), file=sys.stderr)
return 1
return 0
def main(argv):
ret = 0
for path in argv:
ret |= check(path)
return ret
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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