code: function plugin() {
    return function(files, metalsmith, done) {
      Object.keys(files).forEach(function(file) {
        if (!~file.indexOf('.html')) return;
        var $ = cheerio.load(files[file].contents);
        var links = $('a');
        for (var i = links.length - 1; i >= 0; i--) {
          var url = links[i].attribs.href;
          if (image(url)) $(links[i]).append(img(url));
        }
        $.root().prepend(css());
        files[file].contents = new Buffer($.html());
      });
      done();
    };
  }
docs: Plugin to show images or gifs from anchor elements on hover.
  
  @return {Function}