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

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class RstripExtension:

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menudefs = [

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('format', [None, ('Strip trailing whitespace', '<<do-rstrip>>'), ] ), ]

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def __init__(self, editwin):

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self.editwin = editwin

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self.editwin.text.bind("<<do-rstrip>>", self.do_rstrip)

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def do_rstrip(self, event=None):

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text = self.editwin.text

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undo = self.editwin.undo

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undo.undo_block_start()

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end_line = int(float(text.index('end')))

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for cur in range(1, end_line):

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txt = text.get('%i.0' % cur, '%i.end' % cur)

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raw = len(txt)

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cut = len(txt.rstrip())

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# Since text.delete() marks file as changed, even if not,

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# only call it when needed to actually delete something.

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if cut < raw:

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text.delete('%i.%i' % (cur, cut), '%i.end' % cur)

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undo.undo_block_stop()

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if __name__ == "__main__":

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import unittest

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unittest.main('idlelib.idle_test.test_rstrip', verbosity=2, exit=False)

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