qmk_firmware_custom/keyboards/satan/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

enum custom_keycodes {
  SFT_ESC = SAFE_RANGE
};

// 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.
enum layer_names {
  _BL,
  _FL
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Keymap _BL: (Base Layer) Default Layer
   * ,-----------------------------------------------------------.
   * |Esc| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | = | Backsp|
   * |-----------------------------------------------------------|
   * | Tab | Q | W | E | R | T | Y | U | I | O | P | [ | ] |  \  |
   * |-----------------------------------------------------------|
   * | Caps  | A | S | D | F | G | H | J | K | L | ; | ' | Enter |
   * |-----------------------------------------------------------|
   * | Shift  | Z | X | C | V | B | N | M | , | . | / |    Shift |
   * |-----------------------------------------------------------|
   * |Ctrl|GUI |Alt |         Space         | Alt| GUI| Fn | Ctrl|
   * `-----------------------------------------------------------'
   */
  [_BL] = LAYOUT_60_ansi(
    SFT_ESC, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC, \
    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS, \
    KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,  \
    KC_LSFT,          KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT, \
    KC_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, KC_RGUI, MO(_FL), KC_RCTL
  ),

  /* Keymap _FL: Function Layer
   * ,-----------------------------------------------------------.
   * | ` |   |   |   |   |   |   |   |   |   |   |   |   | Reset |
   * |-----------------------------------------------------------|
   * |     |   |   |   |   |   |   |   |   |   |   |BL-|BL+|  BL |
   * |-----------------------------------------------------------|
   * |      |   |   |   |   |   |   |   |   |   |   |   |        |
   * |-----------------------------------------------------------|
   * |        |   |   |   |   |   |   |   |   |   |   |          |
   * |-----------------------------------------------------------|
   * |    |    |    |                        |    |    |    |    |
   * `-----------------------------------------------------------'
   */
  [_FL] = LAYOUT_60_ansi(
    KC_GRV,  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, RESET,   \
    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, BL_DEC,  BL_INC,  BL_TOGG, \
    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, \
    _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, \
    _______, _______, _______,                            _______,                            _______, _______, _______, _______
  )
};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case SFT_ESC:
      if (record->event.pressed) {
        if (get_mods() & MOD_MASK_SHIFT) {
          add_key(KC_GRV);
          send_keyboard_report();
        } else {
          add_key(KC_ESC);
          send_keyboard_report();
        }
      } else {
        if (get_mods() & MOD_MASK_SHIFT) {
          del_key(KC_GRV);
          send_keyboard_report();
        } else {
          del_key(KC_ESC);
          send_keyboard_report();
        }
      }

      return false;

    default:
      return true;
  }
}