File: line_endings.py

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

import sys, re, os

def dos2unix(file):
    "Replace CRLF with LF in argument files.  Print names of changed files."    
    if os.path.isdir(file):
        print file, "Directory!"
        return
        
    data = open(file, "rb").read()
    if '\0' in data:
        print file, "Binary!"
        return
        
    newdata = re.sub("\r\n", "\n", data)
    if newdata != data:
        print 'dos2unix:', file
        f = open(file, "wb")
        f.write(newdata)
        f.close()
        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
        
    data = open(file, "rb").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
        f = open(file, "wb")
        f.write(newdata)
        f.close()
        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__":
    import sys
    dos2unix_dir(sys.argv[1])