Fix Ctrl-W/Y in xonsh

xonsh/bindings.xsh

@@ -0,0 +1,16 @@
+from prompt_toolkit.key_binding.bindings.named_commands import get_by_name
+from prompt_toolkit.keys import Keys
+
+@events.on_ptk_create
+def custom_keybindings(bindings, **kw):
+    @bindings.add(Keys.ControlW)
+    def delete_word(event):
+        get_by_name("backward-kill-word").call(event)
+
+    @bindings.add(Keys.ControlX, Keys.ControlA)
+    def select_all(event):
+        buffer = event.current_buffer
+        buffer.cursor_position = 0
+        buffer.start_selection()
+        buffer.selection_state.enter_shift_mode()
+        buffer.cursor_position = len(buffer.text)