intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 25 insertions, 0 deletions

diff --git a/contrib/python/prompt-toolkit/py2/prompt_toolkit/key_binding/bindings/utils.py b/contrib/python/prompt-toolkit/py2/prompt_toolkit/key_binding/bindings/utils.py
new file mode 100644
index 0000000000..caf08c5c1b
--- /dev/null
+++ b/contrib/python/prompt-toolkit/py2/prompt_toolkit/key_binding/bindings/utils.py
@@ -0,0 +1,25 @@
+from __future__ import unicode_literals
+from prompt_toolkit.filters import CLIFilter, Always
+
+__all__ = (
+    'create_handle_decorator',
+)
+
+def create_handle_decorator(registry, filter=Always()):
+    """
+    Create a key handle decorator, which is compatible with `Registry.handle`,
+    but will chain the given filter to every key binding.
+
+    :param filter: `CLIFilter`
+    """
+    assert isinstance(filter, CLIFilter)
+
+    def handle(*keys, **kw):
+        # Chain the given filter to the filter of this specific binding.
+        if 'filter' in kw:
+            kw['filter'] = kw['filter'] & filter
+        else:
+            kw['filter'] = filter
+
+        return registry.add_binding(*keys, **kw)
+    return handle