runner.js

var spawn = require('child_process').spawn;

var dataOfDownload = {};

function Row(rowString){
	if (rowString.indexOf("[") == -1) {
		this.type = "Unknown";
		return;
	};
	//splits '[a]b' to ['a','b']
	var rowParts = rowString.split(/[\[+\]]/).filter(s=>s.length>1);
	this.type = rowParts[0].trim();
	this.value = rowParts[1].trim();
}

function splitAndDisplayLog (chunk) {
	chunkString = chunk.toString();
    var rowArray = splitLogToRows(chunkString);
    rowArray.forEach(function(row) {
    	switch(row.type) {
    		case "youtube:playlist":
    			parseYouTubePlayList(row.value);
    			break;
    		case "download":
    			parseDownload(row.value);
    			break;
			case "ffmpeg":
				parseffmpeg(row.value);
				break;
			case "youtube":
				break;
			default:
				console.log("Recieved Unknown Key:"+row.type);
			}
    });
}
function splitLogToRows(chunk){
	console.log(chunk);
	splittedChunk = chunkString.split("\n");
	var rowArray = [];
	splittedChunk.forEach(function(rowStr) {
		if (rowStr.indexOf("Deleting") == 0) {
			rowStr = "[ffmpeg]"+rowStr;
		}
		var splittedRow = rowStr.split("[").filter(s=>s.length>1);
		if (splittedRow.length == 1) {
			rowArray.push(new Row(rowStr));
		}
		else {			
			splittedRow.forEach(r=>rowArray.push(new Row("["+r)));
		}
	});
	console.log(rowArray);	
	return rowArray;
}

 function parseffmpeg (log) {
 	if(log.indexOf("Destination") == 0){
 		$("#converting").html("Converting to mp3..."); 		
 	}
 	else {
 		$("#converting").html("Finished converting! saving the file..");
 	}
 }

function parseDownload (log) {
	if(log.indexOf("Downloading playlist:")==0){
		playListName = log.substring("Downloading playlist:".length+1,log.length-1);
		dataOfDownload["playlist"]["name"] = playListName;
		$('#listStatus').html("Start download playlist " + playListName);
		return;
	}
	if(log.indexOf("Downloading video ") == 0){
		//[download] Downloading video 1 of 26 
		videoNumber = log.substr("Downloading video ".length);
		videoNumber = videoNumber.substring(0,videoNumber.indexOf(" "));
		$("#downloadProgress").hide();
		dataOfDownload["current"] = {};
		dataOfDownload["current"]["number"] =  videoNumber;
		$("#videoNumber").html("video number: " + videoNumber);
		return;
	}
	if(log.indexOf("Destination: ") == 0){
		//[download] Destination: Arctic Monkeys - Arabella (Official Audio)-Jn6-TItCazo.m4a 
		if (dataOfDownload["current"] == undefined) {
			dataOfDownload["current"] = {};
			$("#downloadProgress").hide();
		}
		videoName = log.substr("Destination: ".length);		
		dataOfDownload["current"]["name"] =  videoName;
		$("#videoName").html("video name:" + videoName);
	}
	if(log.indexOf("% of")!=-1 && log.indexOf("ETA")!=-1){
		//[download] X% of YMiB at ZKiB/s ETA TIME .
		//[download] 100% of 6.31MiB in 00:01 "	
		$("#downloadProgress").show();
		$("#downloadProgress").css("display","block");
		percentage = log.substring(0,log.indexOf("%"));
		dataOfDownload["current"]["percentage"] = percentage;
		timeLeft = log.substr(log.indexOf("ETA ") + "ETA ".length);
		dataOfDownload["current"]["eta"] = timeLeft;
		$("#percentage").html(percentage);
		$("#percentage").width(percentage+"%");		
		$("#ETA").html(timeLeft);
		return;
	}
	
	
}
function parseYouTubePlayList(log){
	//start message
	if(log.indexOf("add --no-playlist to") != -1){
		//take name from message
		//Downloading playlist RDJn6-TItCazo - add --no-playlist to just download video 
		 afterPlayList = log.substr(log.indexOf("playlist") + "playlist".length+1);
		 space = afterPlayList.indexOf(" ");
		 playListCode = afterPlayList.substring(0,space);
		 dataOfDownload["playlist"] = {"code": playListCode};
		 $('#listStatus').append("Analyzing playlist " + playListCode);
		 return;
	}
	//second message
	if(log.indexOf(dataOfDownload["playlist"]["code"]) == 0){
		playListType = log.substr(log.indexOf("Downloading") + "Downloading ".length);
		dataOfDownload["playlist"]["type"] = playListType;
		$('#listStatus').html("playlist:" + dataOfDownload["playlist"]["code"] + " is " +playListType);
		return;
	}
	if (log.indexOf("playlist " + dataOfDownload["playlist"]["name"]) == 0){
		//[youtube:playlist] playlist Mix - Arctic Monkeys - Arabella (Official Audio): Collected 26 video ids (downloading 26 of them) 
		numOfSongs = log.substr("playlist ".length + dataOfDownload["playlist"]["name"].length + ": Collected ".length);
		numOfSongs = numOfSongs.substring(0,numOfSongs.indexOf(" video"));
		dataOfDownload["playlist"]["numOfSongs"] = numOfSongs;
		$('#listStatus').append(" (" + numOfSongs +" videos)");
	}
}

// $('.openDownload').on('click', function (e) {
// 	var $file = $()shell.openItem(fullPath)
// })

$('#addDownload').on('click', function (e) {	

	var link = document.querySelectorAll('#downloadUrl')[0].value;
	var options = ['--no-check-certificate', '--output=./videos/%(title)s-%(extractor_key)s%(id)s.%(ext)s', link];

	var child = spawn('youtube-dl', options);

	child.stdout.on('data', function(chunk) {
		// reset form
		$('#downloadUrl').val('')
		//todo: process the logs and do stuff according to regex..
		//$('#progress').append(chunk+"</br><br>");
		splitAndDisplayLog(chunk);
	});

	child.stderr.on('data', function (data) {
		console.log('ERROR: ' + data);
	});

});