format src, mormalize new line token, remove space at end of line and expand tabs

format_src.py

# -*- coding: UTF-8 -*-
'''
format source code 
normalize newline token, remove space at end of line and expand tabs
wrote in python 3k

@Author: bitdewy (bitdewy (at) gmail.com)
'''

import locale, os, re, stat

unix = '\n'
mac = '\r'
dos = '\r\n'
ts = 2
cpp = '.*\\.(h|hpp|c|cc|cpp)$'

def main(path = '.', tabsize = ts, newline = unix, regex = cpp):
    def format_file(filename, tabsize, newline):
        encoding = locale.getpreferredencoding()
        try:
            f = open(filename, 'r+', 1, encoding, 'strict', newline)
        except IOError:
            raise
        content = ''
        try:
            for line in f:
                content += line.expandtabs(tabsize).rstrip() + newline
        except ValueError:
            f.close()
            raise
        f.truncate(0)
        f.seek(0)
        f.write(content)
        f.close()

    for item in os.listdir(path):
        pathname = os.path.join(path, item)
        mode = os.stat(pathname).st_mode
        if stat.S_ISDIR(mode):
            main(pathname)
        elif stat.S_ISREG(mode) and re.match(regex, pathname):
            try:
                format_file(pathname, tabsize, newline)
            except Exception as err:
                print('format file error: {0} {1}'.format(pathname, err))
        else:
            print('file: {0} not match'.format(pathname))

if __name__ == '__main__':
    main()