Parse multiple Export XML file and output fields

id-guid-aet.js

#!/usr/bin/env node

//usage: find ~/Documents/Export -name "*.txt" -exec node id-guid-aet.js {} ';' > id-guid-aet.csv
//or sorted: find ~/Documents/Export -name "*.txt" | sort | while IFS= read -r filename; do node id-guid.js "$filename"; done > id-guid-aet.csv

const fs = require('fs');
const node_xml_stream = require('node-xml-stream');
const parser = new node_xml_stream();
const filename = process.argv[2];
var tag,item;

if (!filename) return console.error("usage: ./index.js input_xml_file");
if (!fs.existsSync(filename)) return console.error("File not foud: " + filename);
console.error(filename); //not realy error but for feedback during run
let stream = fs.createReadStream(filename, 'UTF-8');
stream.pipe(parser);

parser.on('opentag', function(name, attrs) {
  tag = name;
  if (name=="AHD") {
    //save first
    if (item) console.log(item["id"]+","+item["guid"]+","+item["aet"]+","+item["ahd_id"]);
    
    //prepare for new item
    item = {};
  }
});

parser.on('text', function(text) {
  item[tag.toLowerCase()] = text;
});