xspfcat

xspfcat.js

#!/usr/bin/node
// License: Public Domain

if(process.argv.length != 3)
{
	console.log("Lists XSPF files as fb2k-style text playlists.");
	console.log("Syntax: xspfcat.js playlist.xspf");
	process.exit(1);
}

function two_digits(num){return num>9?num:"0"+num;}

function cut(big, start, end)
{
	if(start)
	{
		var pos = big.indexOf(start);
		if(pos == -1) return "";
		big = big.substr(pos + start.length);	
	}
	if(!end) return big;
	big = big.substr(0,big.indexOf(end));
	return big;
}


var fs = require("fs");
var file = process.argv[2];
var xml = fs.readFileSync(file)+"";
var tags = ["title", "creator", "album", "trackNum", "location"];
var symbols = // source: https://github.com/buglabs/node-xml2json
{
    '<': '&lt;',
    '>': '&gt;',
    '(': '&#40;',
    ')': '&#41;',
    '#': '&#35;',
    '&': '&amp;',
    '"': '&quot;',
    "'": '&apos;'
};

while(xml.indexOf("<track>") > -1)
{
	// parse the track into obj
	var obj = {};
	xml = cut(xml, "<track>");
	var track = cut(xml, null, "</track>");
	for(var i=0;i<tags.length;i++)
	{
		var tag = tags[i];
		var value = cut(track, "<"+tag+">", "</"+tag+">");
		for(var symbol in symbols)
			while(value.indexOf(symbols[symbol]) > -1)
				value = value.replace(symbols[symbol], symbol);
		obj[tag] = value;
	}
	
	// output fb2k style
	var line = obj.creator;
	if(obj.title)
	{
		if(obj.album)
		{
			line+=" ["+obj.album;
			if(obj.trackNum) line+=" #"+two_digits(obj.trackNum);
			line+="] - ";
		}
		else line+=" - ";
		line+=obj.title;
	}
	else line = obj.location;
	console.log(line);
}