Small utility that merges 'checkstyle' files into one

checkstyle.js

var fs = require("fs");
var xml2js = require("xml2js");

var argv = require("yargs")
  .alias("d", "dir")
  .alias("o", "out").argv;

var INPUT_DIRECTORY = "./";
var OUTPUT_FILE = INPUT_DIRECTORY + "merged/checkstyle.xml";

if (argv.dir) {
  INPUT_DIRECTORY = argv.dir;
}

if (argv.out) {
  OUTPUT_FILE = argv.out;
}

// output
var merged = null;

var filenames = fs.readdirSync(INPUT_DIRECTORY);

filenames.forEach(function(filename) {
  if (!isFile(filename) || !filename.endsWith(".xml")) {
    return;
  }
  var content = fs.readFileSync(INPUT_DIRECTORY + filename, "utf-8");

  var xmlParser = new xml2js.Parser();
  xmlParser.parseString(content, function(err, result) {
    if (merged == null) {
      merged = result;
    } else {
      merged.checkstyle.file = merged.checkstyle.file.concat(
        result.checkstyle.file
      );
    }
  });
});

var xmlBuilder = new xml2js.Builder();
var xml = xmlBuilder.buildObject(merged);
fs.writeFileSync(OUTPUT_FILE, xml);

/** Helper functions */
function isFile(filePath) {
  return !fs.lstatSync(filePath).isDirectory();
}