1'Provides "Strip trailing whitespace" under the "Format" menu.'
2
3class RstripExtension:
4
5    menudefs = [
6        ('format', [None, ('Strip trailing whitespace', '<<do-rstrip>>'), ] ), ]
7
8    def __init__(self, editwin):
9        self.editwin = editwin
10        self.editwin.text.bind("<<do-rstrip>>", self.do_rstrip)
11
12    def do_rstrip(self, event=None):
13
14        text = self.editwin.text
15        undo = self.editwin.undo
16
17        undo.undo_block_start()
18
19        end_line = int(float(text.index('end')))
20        for cur in range(1, end_line):
21            txt = text.get('%i.0' % cur, '%i.end' % cur)
22            raw = len(txt)
23            cut = len(txt.rstrip())
24            # Since text.delete() marks file as changed, even if not,
25            # only call it when needed to actually delete something.
26            if cut < raw:
27                text.delete('%i.%i' % (cur, cut), '%i.end' % cur)
28
29        undo.undo_block_stop()
30
31if __name__ == "__main__":
32    import unittest
33    unittest.main('idlelib.idle_test.test_rstrip', verbosity=2, exit=False)
34