Merge issue #26355 fix from Python 3.5

1 files changed, 33 insertions, 0 deletions

diff --git a/Lib/idlelib/rstrip.py b/Lib/idlelib/rstrip.py
new file mode 100644
index 0000000000..2ce3c7eafe
--- /dev/null
+++ b/Lib/idlelib/rstrip.py
@@ -0,0 +1,33 @@
+'Provides "Strip trailing whitespace" under the "Format" menu.'
+
+class RstripExtension:
+
+    menudefs = [
+        ('format', [None, ('Strip trailing whitespace', '<<do-rstrip>>'), ] ), ]
+
+    def __init__(self, editwin):
+        self.editwin = editwin
+        self.editwin.text.bind("<<do-rstrip>>", self.do_rstrip)
+
+    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__":
+    import unittest
+    unittest.main('idlelib.idle_test.test_rstrip', verbosity=2, exit=False)