Add keymap wrappers for introspection into the keymap. (#17229)

* Introspection handlers for keymaps.

* Renaming.

3 files changed, 42 insertions, 0 deletions

diff --git a/quantum/keymap.h b/quantum/keymap.h
index d64b271efb..081bc54ebe 100644
--- a/quantum/keymap.h
+++ b/quantum/keymap.h
@@ -55,3 +55,5 @@ extern const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
 // Ensure we have a forward declaration for the encoder map
 #    include "encoder.h"
 #endif
+
+#include "keymap_introspection.h"
diff --git a/quantum/keymap_introspection.c b/quantum/keymap_introspection.c
new file mode 100644
index 0000000000..9628b41eef
--- /dev/null
+++ b/quantum/keymap_introspection.c
@@ -0,0 +1,25 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+// Pull the actual keymap code so that we can inspect stuff from it
+#include KEYMAP_C
+
+#include "keymap_introspection.h"
+
+#define NUM_KEYMAP_LAYERS ((uint8_t)(sizeof(keymaps) / ((MATRIX_ROWS) * (MATRIX_COLS) * sizeof(uint16_t))))
+
+uint8_t keymap_layer_count(void) {
+    return NUM_KEYMAP_LAYERS;
+}
+
+#if defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
+
+#    define NUM_ENCODERMAP_LAYERS ((uint8_t)(sizeof(encoder_map) / ((NUM_ENCODERS) * (2) * sizeof(uint16_t))))
+
+uint8_t encodermap_layer_count(void) {
+    return NUM_ENCODERMAP_LAYERS;
+}
+
+_Static_assert(NUM_KEYMAP_LAYERS == NUM_ENCODERMAP_LAYERS, "Number of encoder_map layers doesn't match the number of keymap layers");
+
+#endif // defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
diff --git a/quantum/keymap_introspection.h b/quantum/keymap_introspection.h
new file mode 100644
index 0000000000..23f6f2016f
--- /dev/null
+++ b/quantum/keymap_introspection.h
@@ -0,0 +1,15 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <stdint.h>
+
+// Get the number of layers defined in the keymap
+uint8_t keymap_layer_count(void);
+
+#if defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
+
+// Get the number of layers defined in the encoder map
+uint8_t encodermap_layer_count(void);
+
+#endif // defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)