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#! /usr/bin/env python3

"Replace tabs with spaces in argument files. Print names of changed files."

import os

import sys

import getopt

import tokenize

def main():

tabsize = 8

try:

opts, args = getopt.getopt(sys.argv[1:], "t:")

if not args:

raise getopt.error("At least one file argument required")

except getopt.error as msg:

print(msg)

print("usage:", sys.argv[0], "[-t tabwidth] file ...")

return

for optname, optvalue in opts:

if optname == '-t':

tabsize = int(optvalue)

return max(process(filename, tabsize) for filename in args)

def process(filename, tabsize, verbose=True):

try:

with tokenize.open(filename) as f:

text = f.read()

encoding = f.encoding

except IOError as msg:

print("%r: I/O error: %s" % (filename, msg))

return 2

newtext = text.expandtabs(tabsize)

if newtext == text:

return 0

backup = filename + "~"

try:

os.unlink(backup)

except OSError:

pass

try:

os.rename(filename, backup)

except OSError:

pass

with open(filename, "w", encoding=encoding) as f:

f.write(newtext)

if verbose:

print(filename)

return 1

if __name__ == '__main__':

raise SystemExit(main())