From 08c556b78b9dc672a2aa2388bbd3fdf408e3ce98 Mon Sep 17 00:00:00 2001
From: Nick Brassel <nick@tzarc.org>
Date: Sun, 5 Jun 2022 10:26:02 +1000
Subject: Add keymap wrappers for introspection into the keymap. (#17229)

* Introspection handlers for keymaps.

* Renaming.
---
 builddefs/build_keyboard.mk    |  4 +++-
 quantum/keymap.h               |  2 ++
 quantum/keymap_introspection.c | 25 +++++++++++++++++++++++++
 quantum/keymap_introspection.h | 15 +++++++++++++++
 4 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 quantum/keymap_introspection.c
 create mode 100644 quantum/keymap_introspection.h

diff --git a/builddefs/build_keyboard.mk b/builddefs/build_keyboard.mk
index dc86b232df..a258f33216 100644
--- a/builddefs/build_keyboard.mk
+++ b/builddefs/build_keyboard.mk
@@ -390,10 +390,12 @@ ifneq ("$(KEYMAP_H)","")
     CONFIG_H += $(KEYMAP_H)
 endif
 
+OPT_DEFS += -DKEYMAP_C=\"$(KEYMAP_C)\"
+
 # project specific files
 SRC += \
     $(KEYBOARD_SRC) \
-    $(KEYMAP_C) \
+    $(QUANTUM_DIR)/keymap_introspection.c \
     $(QUANTUM_SRC) \
     $(QUANTUM_DIR)/main.c \
 
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)
-- 
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