rename.js

var fs = require('fs');
var path = require('path');
fs.readdir(process.cwd(), function(err, files){
  var newNames = {};
  files.forEach(function(file){
    console.log(file);
    if (file.match(/.+.txt/i)){
	console.log('Found text file', file);
	fs.readFile(path.join(process.cwd(), file), 'utf8', function(err, data){
		newNames[file] = [];
		data.split(/\r\n/g).forEach(function(line){
			console.log('Testing line in', file, ':', line);
			var matches = line.match(/^\s*(\d+)\s*-\s*(.+)/i);
			if (matches){
				var num = matches[1];
				console.log('Found mumber', num);
				var obj = {};
				line = num + ' - ' + matches[2].trim();
				obj[num] = line;
				fs.rename(path.join(process.cwd(), num + '.pdf'), path.join(process.cwd(), line.trim() + '.pdf'), function(err){
					if (err) throw err;						
				})
				newNames[file].push(obj);
				console.log(obj);
			}
		});	
	});
    }
  });
});