Detect duplicates in LFA exercise names

ndf.js

#!/usr/local/bin/node

/*
Install: save this file on an Unix-like system (Linux / OSX / Cygwin)
Put it in path and make it executable:

sudo cp ndf.js /usr/local/bin
sudo chmod a+x ./ndf.js

Usage: ndf.js  $(find . -type f  -print)

Contact Cristian Dinu (@cdinu) for support
*/

var fs = require('fs');
var files = process.argv.slice(2);
var regexp = /name[ ]*:[  ]*['|"]+([^'|"]*)['|"]+/mig;

var names = {};

function parse(fileName, fileContents) {
  fileContents.toString().split('\n').forEach(function(line) {
    var matches = regexp.exec(line);
    if(!matches) return;
    var name = matches[1];
    var exists = names[name];

    if (exists) {
      console.log("%s from file %s alredy defined in %s", name, fileName, exists);
    }

    names[name] = fileName;
  });
}

files.forEach(function (file){
  fs.readFile(file, function (err, data) {
    if (err) throw err;
    parse(file, data);
  });
})