text: #!/usr/bin/python
  
  """
    Usage: check_trailing_whitespaces.py [root]
    This script will check the presence of trailing whitespaces in any file
    below |root|. It will return 0 if none is found. Otherwise, it will print the
    path of the violating file and return an error code.
    If root is not specified, it will use the current directory.
  """
  
  import fileinput
  import os
  import re
  import sys
  
  def has_trailing_whitespaces(path):
    """ Returns whether |path| has trailing whitespaces. """
    for line in open(path, 'r'):
      for idx in range(-1, -len(line) - 1, -1):
        if line[idx] == '\n' or line[idx] == '\r':
          continue
        if line[idx] == ' ':
          return True
        break
    return False
  
  if (len(sys.argv) > 2):
    sys.exit('Usage: ' + sys.argv[0] + ' [root]')
  
  top = os.getcwd()
  if len(sys.argv) == 2:
    top += '/' + sys.argv[1]
  
  for root, dirs, files in os.walk(top):
    for f in files:
      if f.endswith('.py') or f.endswith('.lua') or f.endswith('.h') or \
         f.endswith('.cpp') or f.endswith('.cc') or f.endswith('.c'):
           path = root + '/' + f
           if has_trailing_whitespaces(path):
             sys.exit('Found a file with trailing whitespaces: ' + path)
  
  sys.exit(0)
  
  