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""" Functions for converting from DOS to UNIX line endings

"""
import os
import re
import sys


def dos2unix(file):
    "Replace CRLF with LF in argument files.  Print names of changed files."
    if os.path.isdir(file):
        print(file, "Directory!")
        return

    with open(file, "rb") as fp:
        data = fp.read()
    if '\0' in data:
        print(file, "Binary!")
        return

    newdata = re.sub("\r\n", "\n", data)
    if newdata != data:
        print('dos2unix:', file)
        with open(file, "wb") as f:
            f.write(newdata)
        return file
    else:
        print(file, 'ok')

def dos2unix_one_dir(modified_files, dir_name, file_names):
    for file in file_names:
        full_path = os.path.join(dir_name, file)
        file = dos2unix(full_path)
        if file is not None:
            modified_files.append(file)

def dos2unix_dir(dir_name):
    modified_files = []
    os.path.walk(dir_name, dos2unix_one_dir, modified_files)
    return modified_files
#----------------------------------

def unix2dos(file):
    "Replace LF with CRLF in argument files.  Print names of changed files."
    if os.path.isdir(file):
        print(file, "Directory!")
        return

    with open(file, "rb") as fp:
        data = fp.read()
    if '\0' in data:
        print(file, "Binary!")
        return
    newdata = re.sub("\r\n", "\n", data)
    newdata = re.sub("\n", "\r\n", newdata)
    if newdata != data:
        print('unix2dos:', file)
        with open(file, "wb") as f:
            f.write(newdata)
        return file
    else:
        print(file, 'ok')

def unix2dos_one_dir(modified_files, dir_name, file_names):
    for file in file_names:
        full_path = os.path.join(dir_name, file)
        unix2dos(full_path)
        if file is not None:
            modified_files.append(file)

def unix2dos_dir(dir_name):
    modified_files = []
    os.path.walk(dir_name, unix2dos_one_dir, modified_files)
    return modified_files

if __name__ == "__main__":
    dos2unix_dir(sys.argv[1])