4chan magnet links extension

manifest.json

{
  "manifest_version": 2,

  "name": "4chan magnet links",
  "description": "",
  "version": "0.1",

  "content_scripts": [
  	{
      "matches": [
        "http://boards.4chan.org/*"
  	  ],
  	  "js": ["parse.js"],
  	  "run_at": "document_end"
  	}
  ]/*,
  
  "icons": { "16": "icon16.png",
             "48": "icon48.png",
            "128": "icon128.png" }
*/
}

parse.js

var postMessages = document.querySelectorAll(".postMessage");

[].forEach.call(postMessages, function(postMessage) {
	var lines = postMessage.innerHTML.split("<br>");
	
	lines.forEach(function(line, i){
		if (line.substr(0,7) == 'magnet:') {
			var dnIndex = line.indexOf("&amp;dn=");
			var title = dnIndex ? ' for ' + decodeURIComponent(line.substr(dnIndex + 8)) : '';
			
			lines[i] = '<a href="' + line + '">Magnet' + title + '</a>';
		}
	});
	
	postMessage.innerHTML = lines.join('<br>');
});