filenamelimit

PHP
function filenamelimit($filename) {
    $limit = 20; // configure aqui o limite

    $fn = $filename;
    $filename = explode(".", $filename);
    if(count($filename)<2) return $fn;

    $ext = end($filename);
    $fname = str_replace(".".$ext, "", $fn);
    if(strlen($fname)>$limit) {
        $fname = substr($fname, 0, $limit);
        $fname .= "(...)";
    }
    return $fname.".".$ext;
}

Javascript
function filenamelimit(filename) {
  var limit = 20; // configure aqui o limite

  var fn = filename;
  filename = filename.split(".");
  if(filename.length<2) return fn;

  ext = filename[filename.length-1];
  fname = fn.replace("."+ext, "");
  if(fname.length>limit) {
    fname = fname.substr(0, limit);
    fname += "(...)";
  }
  return fname+"."+ext;
}