function taxonomy_combination_views_arguments()
{
  $arguments = array();
  foreach (taxonomy_get_vocabularies() as $vocabulary) {
    if($vocabulary->taxonomy_combination_show)
    {
      $arguments['tc_taxinvoc_' . $vocabulary->vid] = array(
        'name' => t('Taxonomy: Term Name from ' . $vocabulary->name),
        'handler' => 'views_handler_tc_taxinvoc',
        'help' => t('The argument will filter by a taxonomy term name from the vocabulary ' . $vocabulary->name),
      );
    }
  }
  return $arguments;
}

function vocab_id_from_typename($typename)
{
  return end(explode('_', $typename));
}

function views_handler_tc_taxinvoc($op, &$query, $argtype, $arg = '') {
  static $field = NULL;
/*  drupal_set_message($op);
  echo "\n<br>op<br>\n";
  echo "$op<br>\n";
  echo "query<br>\n";
  print_r($query);
  echo "argtype<br>\n";
  print_r($argtype);
  echo "arg<br>\n";
  print_r($arg);
  echo "<br>vocab id would be:<br>";
  echo vocab_id_from_typename($argtype);*/
  echo "<br>\n";
  echo $op;
  echo "<br>\n";
  switch($op) {
    case 'summary':
      //$argtype has typename
      //summary for the second one won't work
      $tnum = $query->add_table('term_data', true);
      $tablename = $query->get_table_name('term_data', $tnum);
      $len = intval($arg);
      $field = $fieldinfo['field'] = ($len <= 0 ? "$tablename.name" : "LEFT($tablename.name, $len)");

      $fieldinfo['fieldname'] = 'letter';
      $query->add_field('tid', $tablename);
      $query->add_where('%s.name IS NOT NULL', $tablename);
      $vid = vocab_id_from_typename($argtype);
      $query->add_where('%s.vid = %d', $tablename, $vid);
      return $fieldinfo;
      break;
    case 'sort':
      //no typename
      //this looks ok, sorts summary by name.
      $query->add_orderby('', $field, $argtype, 'letter');
      break;
    case 'filter':
      //$argtype['type'] has typename
      $len = intval($argtype['options']);
      
      $tnum = $query->add_table('term_node');
      $tablename = $query->get_table_name('term_node', $tnum);

      $tnum = $query->add_table('term_data', true, 1, array('left' => array('table' => $tablename, 'field' => 'tid'), 'right' => array('field' => 'tid')));
      $tablename = $query->get_table_name('term_data', $tnum);
      $vid = vocab_id_from_typename($argtype['type']);
      $query->add_where($tablename . '.vid = %d', $vid);
      
      if ($len <= 0) {
        $query->add_where("%s.name = '%s'", $tablename, $arg);
      } else {
        $query->add_where("LEFT(%s.name, $len) = '%s'", $tablename, $arg);
      }
      break;
    case 'link':
      //$argtype has typename
      //this is fine
      return l($query->letter, "$arg/$query->letter");
    case 'title':
      //$argtype has typename
      //I guess this is fine too, for now.
      return check_plain($query);
  }
}