relay: send modifier codes

relay.py

@@ -165,14 +165,18 @@ scan_to_hid = {
 }
 
 
-LEFT_CTRL = 1 << 0
-LEFT_SHIFT = 1 << 1
-LEFT_ALT = 1 << 2
-LEFT_GUI = 1 << 3
-RIGHT_CTRL = 1 << 4
-RIGHT_SHIFT = 1 << 5
-RIGHT_ALT = 1 << 6
-RIGHT_GUI = 1 << 7
+modifiers = {
+    evdev.ecodes.KEY_LEFTCTRL: 1 << 0,
+    evdev.ecodes.KEY_LEFTSHIFT: 1 << 1,
+    evdev.ecodes.KEY_LEFTALT: 1 << 2,
+    evdev.ecodes.KEY_LEFTMETA: 1 << 3,
+
+    evdev.ecodes.KEY_RIGHTCTRL: 1 << 4,
+    evdev.ecodes.KEY_RIGHTSHIFT: 1 << 5,
+    evdev.ecodes.KEY_RIGHTALT: 1 << 6,
+    evdev.ecodes.KEY_RIGHTMETA: 1 << 7,
+}
+
 
 
 if __name__ == '__main__':
@@ -196,8 +200,13 @@ if __name__ == '__main__':
         data = evdev.categorize(event)
         print("Got key", data.scancode)
 
-
-
+        modifier = modifiers.get(data.scancode, None)
+        if modifier:
+            if data.keystate == data.key_down:
+                modifier_state |= modifier
+            if data.keystate == data.key_up:
+                modifier_state &= ~modifier
+        else:
             code = scan_to_hid.get(data.scancode, None)
             if code is None:
                 print("Ignoring unknown key")
@@ -215,7 +224,7 @@ if __name__ == '__main__':
                 keys_down.remove(code)
 
         # Build the packet
-        packet = [0] + [0] + [k for k in keys_down]
+        packet = [modifier_state, 0] + [k for k in keys_down]
         packet += [0] * (8 - len(packet))
 
         assert(len(packet) == 8)