User defined vimperator command for opening a feed link in the current tab

open-feed.js

(function() {

  let completer = function (context, args) {
    let feeds = buffer.pageInfo.f[0];
    let completions = [];
    for (let [title, template] in feeds(true)) {
      let dom = util.xmlToDom(template, document);
      let url = dom.firstChild.href;
      completions.push([url, title]);
    }

    context.completions = completions;
    context.title = ['Link', 'Title'];
    context.compare = CompletionContext.Sort.unsorted;
  };

  commands.addUserCommand(
    ['feed'],
    'Open a feed link in the current tab',
    function action(args) {
      liberator.open(args.string);
    },
    {
      completer: completer,
      literal: 0
    },
    true
  );

})();