1  #! /usr/bin/env python3
       2  
       3  "Replace LF with CRLF in argument files.  Print names of changed files."
       4  
       5  import sys, re, os
       6  
       7  def main():
       8      for filename in sys.argv[1:]:
       9          if os.path.isdir(filename):
      10              print(filename, "Directory!")
      11              continue
      12          with open(filename, "rb") as f:
      13              data = f.read()
      14          if b'\0' in data:
      15              print(filename, "Binary!")
      16              continue
      17          newdata = re.sub(b"\r?\n", b"\r\n", data)
      18          if newdata != data:
      19              print(filename)
      20              with open(filename, "wb") as f:
      21                  f.write(newdata)
      22  
      23  if __name__ == '__main__':
      24      main()