p99-combattheme-swapper.js

const fs = require('fs');
const mv = require('mv');
//directory must end with /
const p99Folderr = '/path/to/p99/';
const musicFolder = '/path/to/mp3s/';
const musicFiles = [];

fs.readdir(musicFolder, (err, files) => {
	if(err) console.log(err);
  	//push each mp3 to an array
  	files.forEach(file => {
  		musicFiles.push(file)
  	});
  	//select random mp3 from array
  	let min = 0;
  	let max = musicFiles.length - 1;
  	let randomMusicFile = musicFiles[Math.floor(Math.random() * max) + min];
  	//log which random mp3 has been selected
  	console.log(randomMusicFile);
  	//write new combattheme1.mp3 as a of copy the random mp3
  	fs.createReadStream(musicFolder+randomMusicFile)
  		.on("error", (err) => console.log(err))
  		.pipe( fs.createWriteStream(musicFolder+'combattheme1.mp3')
  			.on("error", (err) => console.log(err)));
  	//move new combattheme1.mp3 to p99 folder
	mv(musicFolder+'combattheme1.mp3', p99Folderr+'combattheme1.mp3', function(err) {
		if(err) console.log(err);
	});
});