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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

function incrementListIndex(current, dir, opt) {
  var len = opt.choices.realLength;
  var shouldLoop = 'loop' in opt ? Boolean(opt.loop) : true;
  if (dir === 'up') {
    if (current > 0) {
      return current - 1;
    }
    return shouldLoop ? len - 1 : current;
  }
  if (dir === 'down') {
    if (current < len - 1) {
      return current + 1;
    }
    return shouldLoop ? 0 : current;
  }
  throw new Error('dir must be up or down');
}

module.exports = incrementListIndex;