Keyboard test

// GLS = 1, bound to the L Shift key (used on my keymap to do ACTION_MACRO(GLS) instead of ACTION_MACRO(1) which is not really understandable
// GLG = 2, bound to the Greek key
bool greekPressed = false;
bool shiftPressed = false;

const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
{
  // MACRODOWN only works in this function
      switch(id) {
        case GLS: // Left Shift was pressed (or released)
          shiftPressed = !shiftPressed;
          // Send the signal to the computer
          if (record->event.pressed)
            register_code(KC_LSFT);
          else
            unregister_code(KC_LSFT);
          // Refresh Greek mode state
          enableDisableGreek();
          break;
        case GLG: // Greek key was pressed (or released)
          greekPressed = !greekPressed;
          enableDisableGreek();
      }
    return MACRO_NONE;
};

void enableDisableGreek()
{
  if (!shiftPressed && !greekPressed)
  {
    ACTION_LAYER_OFF(L_CAPITALGREEK);
    ACTION_LAYER_OFF(L_GREEK);
  }
  else if (!shiftPressed && greekPressed)
  {
    ACTION_LAYER_OFF(L_CAPITALGREEK);
    ACTION_LAYER_ON (L_GREEK);
  }
  else if (shiftPressed && !greekPressed)
  {
    ACTION_LAYER_OFF(L_CAPITALGREEK);
    ACTION_LAYER_OFF(L_GREEK);
  }
  else if (shiftPressed && greekPressed)
  {
    ACTION_LAYER_ON (L_CAPITALGREEK);
    ACTION_LAYER_OFF(L_GREEK);
  }
}