#!/usr/bin/python

import cliapp


class MakeSparseFile(cliapp.Application):

    def add_settings(self):
        self.settings.bytesize(['size'], 'size of whole to append to file')

    def process_args(self, filenames):
        if self.settings['size'] > 0:
            for filename in filenames:
                self.append_hole(filename, self.settings['size'])
            
    def append_hole(self, filename, size):
        f = open(filename, 'r+b')
        f.seek(size - 1, 2)
        print 'pos:', f.tell()
        f.write('\0')
        f.close()
    
    
if __name__ == '__main__':
    MakeSparseFile().run()