Create a kitten to demonstrate the kitty extended keyboard protocol

kittens/key_demo/main.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
+
+import sys
+
+from kitty.key_encoding import (
+    ALT, CTRL, PRESS, RELEASE, REPEAT, SHIFT, SUPER, encode_key_event
+)
+
+from ..tui.handler import Handler
+from ..tui.loop import Loop
+
+
+class KeysHandler(Handler):
+
+    def initialize(self):
+        self.cmd.set_window_title('Kitty extended keyboard protocol demo')
+        self.cmd.set_cursor_visible(False)
+        self.print('Press any keys - Ctrl+C or Ctrl+D will terminate')
+
+    def on_text(self, text, in_bracketed_paste=False):
+        self.print('Text input: ' + text)
+
+    def on_key(self, key_event):
+        etype = {
+            PRESS: 'PRESS',
+            REPEAT: 'REPEAT',
+            RELEASE: 'RELEASE'
+        }[key_event.type]
+        mods = []
+        for m, name in {
+                SHIFT: 'Shift',
+                ALT: 'Alt',
+                CTRL: 'Ctrl',
+                SUPER: 'Super'}.items():
+            if key_event.mods & m:
+                mods.append(name)
+        mods = '+'.join(mods)
+        if mods:
+            mods += '+'
+        self.print('Key {}: {}{} [{}]'.format(etype, mods, key_event.key, encode_key_event(key_event)))
+
+    def on_interrupt(self):
+        self.quit_loop(0)
+
+    def on_eot(self):
+        self.quit_loop(0)
+
+
+def main(args):
+    loop = Loop()
+    handler = KeysHandler()
+    loop.loop(handler)
+    raise SystemExit(loop.return_code)
+
+
+if __name__ == '__main__':
+    main(sys.argv)