var sub = function(val) {
  if (val.length == 0 || val == undefined) {
    return;
  }
  if (val.length > 17) {
    return val.substring(0, 17) + "...";
  } else {
    return val;
  }
}
var subDate = function(val) {
  if (val == undefined||val.length==0) {
    return;
  }
    return val.substring(0, 10);
}

function indexOf(val) {
  if (val.indexOf(".doc") > 0 ||val.indexOf(".docx") > 0 ) {
      return 2;
  } else if(val.indexOf(".ppt") > 0 ||val.indexOf(".pptx") > 0 ) {
      return 3;
  } else if(val.indexOf(".pdf") > 0 ) {
    return 4;
}else if(val.indexOf(".xls") > 0 ||val.indexOf(".xlsx") > 0 ) {
  return 5;
}else{
  return 7
}
}
module.exports.sub = sub;
module.exports.subDate = subDate;
module.exports.indexOf = indexOf;