按下shift ，某一键变为其他键

shift.c

//shift + enter = "  来自：https://github.com/qmk/qmk_firmware/blob/e899cb8940da04fa2610604f0aab417db7fac119/keyboards/mitosis/keymaps/datagrok/keymap.c
bool comm_shifted = false;
bool ques_shifted = false;
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
uint8_t shifted;
  uint16_t s_keycode;
  bool *k_shifted;

  switch (keycode) {
    //特殊 shift
    case KC_ENT:
      s_keycode = KC_QUOT;
      k_shifted = &ques_shifted;
      break;
    case KC_BSPC:
      s_keycode = KC_PIPE;
      k_shifted = &ques_shifted;
      break;
    default:
      return true;
  }

  shifted = get_mods() & (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT));

  // Keydown. If shift is currently pressed, register its alternate keycode.
  if (record->event.pressed && shifted) {
    *k_shifted = true;
    register_code(s_keycode);
    return false;
    // Keyup. If shift was pressed back when the key was pressed, unregister
    // its alternate keycode.
  } else if (!(record->event.pressed) && *k_shifted) {
    *k_shifted = false;
    unregister_code(s_keycode);
    return false;
    // Otherwise, behave as normal.
  } else {
    return true;
  }
}