really complicated nick colorizer

function ColorizeNick(Nick) {
  local hash1 = api.Num(api.MD5(Nick).slice(0, 8),16);
  local hash2 = api.Num(api.MD5(Nick).slice(8, 16),16);
  local hash3 = api.Num(api.MD5(Nick).slice(16, 24),16);
  local hash4 = api.Num(api.MD5(Nick).slice(24, 32),16);
  local hash = abs(hash1+hash2+hash3+hash4)/2;
  local sat = 0.8 + abs(hash1.tofloat()/(-1>>>1))*0.2;
  local light = 0.4 + abs(hash4.tofloat()/(-1>>>1))*0.2;
  local hue = hash.tofloat()/(-1>>>1);
  local rgb = HSL2RGB(hue, sat, light);
  return format("\x0004%.2x%.2x%.2x%s\x000f", rgb[0], rgb[1], rgb[2], Nick);
}

function HSL2RGB(h, s, l) {
// from http://stackoverflow.com/questions/2353211/hsl-to-rgb-color-conversion
  local r, g, b;
  if(!s){
    r = g = b = l; // achromatic
  } else {
    function hue2rgb(p, q, t) {
      if(t < 0) t++;
      if(t > 1) t--;
      if(t < 1.0/6) return p + (q - p) * 6.0 * t;
      if(t < 1.0/2) return q;
      if(t < 2.0/3) return p + (q - p) * (2.0/3 - t) * 6.0;
      return p;
    }
    local q = l < 0.5 ? l * (1.0 + s) : l + s - l * s;
    local p = 2.0 * l - q;
    r = hue2rgb(p, q, h + 1.0/3);
    g = hue2rgb(p, q, h);
    b = hue2rgb(p, q, h - 1.0/3);
  }
  return [(r * 255).tointeger(), (g * 255).tointeger(), (b * 255).tointeger()];
}