qmk_firmware/keyboards/maple_computing/the_ruler/keymaps/default/keymap.c

#include QMK_KEYBOARD_H


// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
#define _DEFAULT 0
#define _FN_1 1
#define _FN_2 2

// Defines for task manager and such
#define CALTDEL LCTL(LALT(KC_DEL))
#define TSKMGR LCTL(LSFT(KC_ESC))

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

/* Default Layer
 * ,-----------------------------------------------.
 * |  FN_2 |   2   |TSKMGR |CALTDEL|  ESC  |  FN_1 |
 * `-----------------------------------------------'
 */
[_DEFAULT] = LAYOUT(
  MO(_FN_2), KC_2, TSKMGR, CALTDEL, KC_ESC, MO(_FN_1)
),

/* FN 1 Layer
 * ,-----------------------------------------------.
 * |RGB_TOG|RGB_HUD|RGB_HUI|RGB_SAD|RGB_SAI|  FN_1 |
 * `-----------------------------------------------'
 */
[_FN_1] = LAYOUT(
  RGB_TOG, RGB_HUD, RGB_HUI, RGB_SAD, RGB_SAI, _______
),

/* FN 2 Layer
 * ,-----------------------------------------------.
 * |  FN_2 |RGB_VAD|RGB_VAI|RGB_MOD|TSKMGR | QK_BOOT |
 * `-----------------------------------------------'
 */
[_FN_2] = LAYOUT(
  _______, RGB_VAD, RGB_VAI, RGB_MOD, TSKMGR, QK_BOOT
)

};