from optparse import OptionParser

import os

import re

import sys

styles = {

    "bsd":

        "/* -*- mode: c; c-file-style: \"bsd\"; indent-tabs-mode: t -*- */\n",

    "krb5":

        "/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */\n"

    }

def dofile(fname, style):

    changed = False

    newname = fname + ".new"

    infile = open(fname)

    outfile = open(newname, "w")

    first = next(infile)

    if (first != style):

        changed = True

        outfile.write(style)

        if re.match(r"""\s*/\*\s*-\*-.*-\*-\s*\*/""", first):

            # Replace first line if it was already a local variables line.

            pass

        else:

            outfile.write(first)

        # Simply copy remaining lines.

        for line in infile:

            outfile.write(line)

    infile.close()

    outfile.close()

    if changed:

        os.rename(newname, fname)

    else:

        os.remove(newname)

parser = OptionParser()

parser.add_option("--cstyle", action="store", dest="style",

                  choices=("bsd", "krb5"), default="krb5")

(options, args) = parser.parse_args()

for fname in args:

    print(fname)

    dofile(fname, styles[options.style])