cordova hook for incrementing build number in config.xml (hooks/before_build/incrementVersion.js)

incrementVersion.js

#!/usr/bin/env node

console.log ( 'incrementing version' );

var fs = require ( 'fs' ),
	xml2js = require ( 'xml2js' );

var parser = new xml2js.Parser ( );

fs.readFile ( "config.xml", function ( err, data ) {
	parser.parseString ( data, function ( err, result ) {

	    var buildArray = result['widget']['$']['version'].split ( '.' );
	    buildArray[2] = Number ( buildArray[2] ) + 1;
	    result['widget']['$']['version'] = buildArray.join ( '.' );

	    var builder = new xml2js.Builder ( );
  		var xml = builder.buildObject ( result );
  
  	    fs.writeFile ( 'config.xml', xml, 0, xml.length, function ( err, written, buffer ) {
  	    	if ( err ) {
  	    		console.log ( "Error: " + written );
  	    	} else {
  				  console.log ( 'config.xml updated' );
  			  }
  		});
        console.log ( 'Done' );
    });
});