Basic mac vs linux modes

keymaps/custom/os_detect.c

@@ -0,0 +1,31 @@
+#include "os_detection.h"
+#include "timer.h"
+#include "rgb_matrix.h"
+
+#include "mac_mode.h"
+
+bool mac_mode = false;
+bool mac_mode_manual = false;
+static bool os_detected = false;
+static uint32_t flash_start = 0;
+
+// Poll OS detection after USB enumeration settles (~2s)
+// Flash indicator color for 500ms then restore default animation
+void matrix_scan_user(void) {
+    if (!os_detected && !mac_mode_manual && timer_elapsed32(0) > 2000) {
+        os_detected = true;
+        os_variant_t os = detected_host_os();
+        mac_mode = (os == OS_MACOS || os == OS_IOS);
+        rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
+        if (mac_mode) {
+            rgb_matrix_sethsv_noeeprom(HSV_GREEN);
+        } else {
+            rgb_matrix_sethsv_noeeprom(HSV_BLUE);
+        }
+        flash_start = timer_read32();
+    }
+    if (flash_start && timer_elapsed32(flash_start) > 500) {
+        flash_start = 0;
+        rgb_matrix_reload_from_eeprom();
+    }
+}