js/index.js

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var carousels = $('.carousel');
carousels.each(function() {
  var $obj = $(this);
  var $inner = $obj.find('.carousel-inner');
  
  var id = 'uuid' + new Date().getTime();
  $obj.addClass(id);

  if ($obj.data('shift') === 1) {
    var items = $obj.find('.item > [class*="col-"]'),
        visibleCnt = $obj.find('.item:first [class*="col-"]').length,
        wrapper = "";
    
    // build styles
    var rule_base = '.carousel.' + id + ' .carousel-inner > .item',
        styles = $('<style></style>'),
        rules = [];
        rules[0] = rule_base + '.next {left: ' + (100 / visibleCnt) + '%; transform: none;}';
        rules[1] = rule_base + '.active {left: 0;}';
        rules[2] = rule_base + '.active.left {left: -' + (100 / visibleCnt) + '%; transform: none;}';
        rules[3] = rule_base + '.next.left {left: 0;}';
        rules[4] = rule_base + '.active.right {left: ' + (100 / visibleCnt) + '%; transform: none;}';
        rules[5] = rule_base + '.prev.right {left: 0;}';
        rules[6] = rule_base + '.prev {left: -' + (100 / visibleCnt) + '%; transform: none;}';
    for (var i = 0; i < rules.length; i++) {
      styles.append(rules[i]);
    }
    $obj.prepend(styles);

    // rebuild items
    for (var i = 0; i < $(items).length; i++) {
      var $item = $(items[i]);
      var parent = $item.parent();
      if (parent.hasClass('item')) {
        if (!wrapper.length) {
          wrapper = parent.clone().removeClass('active').html('');
        }
        $item.unwrap();
      }
      
      var itemGroup = [$item];
      for (var x = 1; x < visibleCnt; x++) {
        var a = i + x;
        var next = $(items[a]);
        if (!next.length) {
          next = $(items[(a - $(items).length)]);
        }
        itemGroup[x] = next.clone();
      }
      var newSet = wrapper.clone().html(itemGroup);
      if (i == 0) {
        newSet.addClass('active');
      }
      newSet.appendTo($inner);
    }
  }
});