qmk-firmware/quantum/keymap_extras/keymap_colemak.h

#ifndef KEYMAP_COLEMAK_H
#define KEYMAP_COLEMAK_H

#include "keymap_common.h"
// For software implementation of colemak
#define CM_Q    KC_Q
#define CM_W    KC_W
#define CM_F    KC_E
#define CM_P    KC_R
#define CM_G    KC_T
#define CM_J    KC_Y
#define CM_L    KC_U
#define CM_U    KC_I
#define CM_Y    KC_O
#define CM_SCLN KC_P

#define CM_A    KC_A
#define CM_R    KC_S
#define CM_S    KC_D
#define CM_T    KC_F
#define CM_D    KC_G
#define CM_H    KC_H
#define CM_N    KC_J
#define CM_E    KC_K
#define CM_I    KC_L
#define CM_O    KC_SCLN
#define CM_SCLN LSFT(CM_SCLN)

#define CM_Z    KC_Z
#define CM_X    KC_X
#define CM_C    KC_C
#define CM_V    KC_V
#define CM_B    KC_B
#define CM_K    KC_N
#define CM_M    KC_M
#define CM_COMM KC_COMM
#define CM_DOT  KC_DOT
#define CM_SLSH KC_SLSH

// Make it easy to support these in macros
// TODO: change macro implementation so these aren't needed
#define KC_CM_Q    CM_Q    
#define KC_CM_W    CM_W    
#define KC_CM_F    CM_F    
#define KC_CM_P    CM_P    
#define KC_CM_G    CM_G    
#define KC_CM_J    CM_J    
#define KC_CM_L    CM_L    
#define KC_CM_U    CM_U    
#define KC_CM_Y    CM_Y    
#define KC_CM_SCLN CM_SCLN 

#define KC_CM_A    CM_A    
#define KC_CM_R    CM_R    
#define KC_CM_S    CM_S    
#define KC_CM_T    CM_T    
#define KC_CM_D    CM_D    
#define KC_CM_H    CM_H    
#define KC_CM_N    CM_N    
#define KC_CM_E    CM_E    
#define KC_CM_I    CM_I    
#define KC_CM_O    CM_O    

#define KC_CM_Z    CM_Z    
#define KC_CM_X    CM_X    
#define KC_CM_C    CM_C    
#define KC_CM_V    CM_V    
#define KC_CM_B    CM_B    
#define KC_CM_K    CM_K    
#define KC_CM_M    CM_M    
#define KC_CM_COMM CM_COMM 
#define KC_CM_DOT  CM_DOT  
#define KC_CM_SLSH CM_SLSH 

#endif