Support a simple macro of a sequence of keycodes (basis for SEND_STRING)

kmk/macros/__init__.py

@@ -0,0 +1,10 @@
+class KMKMacro:
+    def __init__(self, keydown=None, keyup=None):
+        self.keydown = keydown
+        self.keyup = keyup
+
+    def on_keydown(self):
+        return self.keydown() if self.keydown else None
+
+    def on_keyup(self):
+        return self.keyup() if self.keyup else None

kmk/macros/simple.py

@@ -0,0 +1,14 @@
+from kmk.common.event_defs import (hid_report_event, keycode_down_event,
+                                   keycode_up_event)
+from kmk.macros import KMKMacro
+
+
+def simple_key_sequence(seq):
+    def _simple_key_sequence():
+        for key in seq:
+            yield keycode_down_event(key)
+            yield hid_report_event()
+            yield keycode_up_event(key)
+            yield hid_report_event()
+
+    return KMKMacro(keydown=_simple_key_sequence)