Initial cut of Ubuntu webapps script for Discourse. To be called in discourse/app/views/common/_discourse_javascript.html.erb, after Discourse.start().

gistfile1.txt

// ==UserScript==
// @author        Stuart Langridge <sil@kryogenix.org>
// ==/UserScript==

if (external.getUnityObject) {
    window.Unity = external.getUnityObject(1.0);

    // use the Apple touch icon as icon
    var icnsize=0, icnurl;
    Array.prototype.slice.call(document.querySelectorAll("link[rel='apple-touch-icon']")).forEach(function(icn) {
        var szs = (icn.getAttribute("sizes") || "").split("x");
        if (!icn.getAttribute("sizes")) szs = ["10","10"];
        if (szs.length === 2 && parseInt(szs[0], 10) > icnsize) {
            icnsize = parseInt(szs[0], 10);
            icnurl = icn.getAttribute("href");
            if (icnurl.match(/^\//)) { icnurl = location.origin + icnurl; }
        }
    });

    var user = Discourse.User.current();
    if (user) {
        Unity.init({
            name: Discourse.SiteSettings.title,
            iconUrl: icnurl,
            onInit: function() {
                user.addObserver("unread_notifications", function() {
                    var ncount = user.get("unread_notifications");
                    if (ncount === 0) {
                        Unity.MessagingIndicator.clearIndicators();
                        Unity.Launcher.clearCount();
                    } else {
                        Unity.MessagingIndicator.showIndicator("Mentions and replies", {count: ncount});
                        Unity.Launcher.setCount(ncount);
                    }
                });
            }
        });
    }
}