add profile indexing

app/src/profiles.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <zmk/ble.h>
+#include <zmk/endpoints.h>
+#include <zmk/profiles.h>
+
+#include <logging/log.h>
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+zmk_profile_index_t zmk_profile_index(enum zmk_endpoint endpoint, uint8_t profile) {
+    switch (endpoint) {
+    case ZMK_ENDPOINT_USB:
+        return 0;
+    case ZMK_ENDPOINT_BLE:
+        return ZMK_USB_PROFILE_COUNT + profile;
+    }
+
+    CODE_UNREACHABLE;
+}
+
+zmk_profile_index_t zmk_current_profile_index() {
+    const enum zmk_endpoint endpoint = zmk_endpoints_selected();
+    uint8_t profile = 0;
+
+#if IS_ENABLED(CONFIG_ZMK_BLE)
+    if (endpoint == ZMK_ENDPOINT_BLE) {
+        profile = zmk_ble_active_profile_index();
+    }
+#endif
+
+    const zmk_profile_index_t index = zmk_profile_index(endpoint, profile);
+    LOG_DBG("endpoint=%d, profile=%d => profile_index=%d", endpoint, profile, index);
+    return index;
+}