+// TODO: move to action.h?
+/* layer used currently */
+extern uint8_t current_layer;
+/* layer to return or start with */
+extern uint8_t default_layer;
+
+
+/* translates key_t to keycode */
+uint8_t keymap_key_to_keycode(uint8_t layer, key_t key);
+/* translates keycode to action */
+action_t keymap_keycode_to_action(uint8_t keycode);
+/* translates Fn keycode to action */
+action_t keymap_fn_to_action(uint8_t keycode);
+
+
+/* action for key */
+// TODO: should use struct key_t? move to action.h?
+action_t keymap_get_action(uint8_t layer, uint8_t row, uint8_t col);
+
+/* user defined special function */
+void keymap_call_function(keyrecord_t *record, uint8_t id, uint8_t opt);
+
+
+
+#ifndef NO_LEGACY_KEYMAP_SUPPORT
+/* keycode of key */