bool there_are_monsters_nearby()
{
    const int ystart = MAX(0,       you.y_pos - 9);
    const int yend   = MIN(GYM - 1, you.y_pos + 9);
    const int xstart = MAX(0,       you.x_pos - 9);
    const int xend   = MIN(GXM - 1, you.x_pos + 9);

    // Monster check.
    for (int y = ystart; y <= yend; ++y)
    {
        for (int x = xstart; x <= xend; ++x)
        {
            // If you can see a monster, then it's nearby.
            if (see_grid(x, y))
            {
                const int targ_monst = mgrd[x][y];
                if (targ_monst != NON_MONSTER)
                {
                    const monsters *mon = &menv[targ_monst];
                    if (!mons_is_submerged(mon))
                        return (true);
                }
            }
        }
    }
    return (false);
}

bool there_are_monsters_nearby()
{
    // Monster check.
    std::vector<monsters*> visible;
    get_playervisible_monsters(visible, false, true);
    return (!visible.empty());
}