#! /usr/bin/env python

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

import os

import sys

import getopt

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, msg:

        print msg

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

        return

    for optname, optvalue in opts:

        if optname == '-t':

            tabsize = int(optvalue)

    for filename in args:

        process(filename, tabsize)

def process(filename, tabsize):

    try:

        f = open(filename)

        text = f.read()

        f.close()

    except IOError, msg:

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

        return

    newtext = text.expandtabs(tabsize)

    if newtext == text:

        return

    backup = filename + "~"

    try:

        os.unlink(backup)

    except os.error:

        pass

    try:

        os.rename(filename, backup)

    except os.error:

        pass

    f = open(filename, "w")

    f.write(newtext)

    f.close()

    print filename

if __name__ == '__main__':

    main()