[userscript] Unassigned filter in GitHub issues screen

us-github-unassigned-issues-filter.js

// ==UserScript==
// @name       Unassigned issues filter in GitHub
// @namespace  
// @version    0.1
// @description  Add unassigned issue link in issues filters
// @match      https://github.com/*/*/issues*
// @copyright  2014+, Shady Sharaf <shady@sharaf.me>
// @see http://stackoverflow.com/questions/9711923/is-there-any-way-show-all-github-tickets-without-an-assignee
// ==/UserScript==
var fn = function(){
    var ul = $('.filter-list.js-pjax-active'),
        clone = ul.children().last().clone(),
        anchor = clone.find('a')
        ;
    if ( clone ) {
        anchor.attr('href', anchor.attr('href').replace(/mentioned\/[^\/\?]+/, 'assigned/none') ).text('Unassigned');
        ul.append(clone);
    }
}
$(document).on('pjax:complete', function() {
  fn();
});
fn();

Preview: