Resize Clip Group

(function() {
  var w = 500; // Width, mm
  var h = 700; // Height, mm
  var pos = null;

  for (var i = 0, len = selection.length; i < len; i++) {
    var s = selection[i];
    var m = null;
    if (s.typename === 'GroupItem' && s.clipped) {
      m = getMask(s.pageItems);
    } else {
      m = s;
    }

    // Get scale ration and resize
    var rX = 100 * mm2px(w) / m.width;
    var rY = 100 * mm2px(h) / m.height;
    s.resize(
      rX, // X
      rY, // Y
      true, // Change Positions
      true, // Change Fill Patterns
      true, // Change Fill Gradients
      true, // Change Stroke Pattern
      100, // Stroke scale %
    );

    // Horizontal stack order from first selected object
    if (i == 0) {
      pos = m.position;
    } else {
      s.translate(pos[0] - m.position[0] + m.width, pos[1] - m.position[1]);
      pos = m.position;
    }
  }


  function getMask(arr) {
    for (var i = 0, len = arr.length; i < len; i++) {
      var p = arr[i];
      if (p.typename === 'PathItem' && p.clipping) {
        return p;
      } else if (p.typename === 'CompoundPathItem' && p.pathItems.length && p.pathItems[0].clipping) {
        return p;
      }
    }
  }

  function mm2px(n) {
    return n * 2.83464567;
  }
})();