qmk_firmware/quantum/keymap_introspection.h

// 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);

// Get the keycode for the keymap location, stored in firmware rather than any other persistent storage
uint16_t keycode_at_keymap_location_raw(uint8_t layer_num, uint8_t row, uint8_t column);
// Get the keycode for the keymap location, potentially stored dynamically
uint16_t keycode_at_keymap_location(uint8_t layer_num, uint8_t row, uint8_t column);

#if defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)

// Get the number of layers defined in the encoder map
uint8_t encodermap_layer_count(void);

// Get the keycode for the encoder mapping location, stored in firmware rather than any other persistent storage
uint16_t keycode_at_encodermap_location_raw(uint8_t layer_num, uint8_t encoder_idx, bool clockwise);
// Get the keycode for the encoder mapping location, potentially stored dynamically
uint16_t keycode_at_encodermap_location(uint8_t layer_num, uint8_t encoder_idx, bool clockwise);

#endif // defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)