Advanced scripting help - reading file into array

[m-elias]

I'm not sure where else to ask this question so please forgive if this is the wrong place.

I'm trying to modify a script I found https://github.com/kamilfb/mqtt-spy/issues/116 for bulk clearing retained messages. I would like to modify it to load a list of topics from a text file but I'm running into errors with the examples I'm finding online. I understand mqtt-spy uses Nashorn JS but I get a "readFully" is not defined error or fs.readFileSync is not a function. It works when I use the array. Here's what I have.

// Delete a bunch of retained messages
// Wrap the script in a method, so that you can do "return false;" in case of an error or stop request
function publish() {
	var Thread = Java.type("java.lang.Thread");
		
	var fs = "";
	//var text = readFully("topiclist.txt");
	var text = fs.readFileSync("D:/Matt/Dropbox/MQTT-Spy/mqtt-spy-userprofile/topiclist.txt").toString('utf-8');
	var topics = text.split("\n")

	// Define an array for topics we want to process
//	var topics = [
//		'test/msg',
//		'test/status'
//	];

	// Loop through each topic
	topics.forEach(function(topic) {
    
		// Publish blank payload with retain false
		// removes retained messages
		mqttspy.publish(topic, 'test', 0, false);	// topic, payload, qos, retained

		// Add some sleepy time and allow
		// mqtt_spy to interrupt if needed
		try {
			Thread.sleep(100);
		} catch(err) {
			return false;
		}
	});
  
	// This means all OK, script has completed without any issues and as expected
	// return false if needed
	return true;
}
publish();
//EOF

[kamilfb]

@m-elias, try this:

// Delete a bunch of retained messages
// Wrap the script in a method, so that you can do "return false;" in case of an error or stop request
function publish() {
	var Thread = Java.type("java.lang.Thread");
	var File = Java.type("java.io.File");
	var FileUtils = Java.type("org.apache.commons.io.FileUtils");
		
	var topics = FileUtils.readLines(new File("/home/kamil/topics.txt"), "utf-8");
	
	// Loop through each topic
	topics.forEach(function(topic) {
    
		// Publish blank payload with retain false
		// removes retained messages
		mqttspy.publish(topic, 'test', 0, false);	// topic, payload, qos, retained

		// Add some sleepy time and allow
		// mqtt_spy to interrupt if needed
		try {
			Thread.sleep(100);
		} catch(err) {
			return false;
		}
	});
  
	// This means all OK, script has completed without any issues and as expected
	// return false if needed
	return true;
}
publish();
//EOF

[m-elias]

Thanks @kamilfb! It works!