'Provides "Strip trailing whitespace" under the "Format" menu.'

class Rstrip:

 def __init__(self, editwin):
 self.editwin = editwin

 def do_rstrip(self, event=None):

 text = self.editwin.text
 undo = self.editwin.undo

 undo.undo_block_start()

 end_line = int(float(text.index('end')))
 for cur in range(1, end_line):
 txt = text.get('%i.0' % cur, '%i.end' % cur)
 raw = len(txt)
 cut = len(txt.rstrip())
 # Since text.delete() marks file as changed, even if not,
 # only call it when needed to actually delete something.
 if cut < raw:
 text.delete('%i.%i' % (cur, cut), '%i.end' % cur)

 undo.undo_block_stop()

if __name__ == "__main__":
 from unittest import main
 main('idlelib.idle_test.test_rstrip', verbosity=2,)