shorten-bookmarklet.js

/* Expanded form of a bookmarklet for extracting rev=canonical OR tinyurling a page */
(function(){
    var url=document.location;
    var links=document.getElementsByTagName('link');
    var found=0;
    for(var i = 0, l; l = links[i]; i++) {
        if (l.getAttribute('rev') == 'canonical' || (/alternate short/).exec(l.getAttribute('rel'))) {
            found=l.getAttribute('href');
            break;
        }
    }
    if (!found) {
        for (var i = 0; l = document.links[i]; i++) {
            if (l.getAttribute('rev') == 'canonical') {
                found = l.getAttribute('href');
                break;
            }
        }
    }
    if (found) {
        prompt('Canonical URL:', found);
    } else {
        prompt('No declared canonical URL, here is the original:', url);
    }
})();