Qiita Tag Search Enhancer: Provide a way to search by multiple tags easily.

qiita-tag-search-enhancer.user.js

// ==UserScript==
// @name         Qiita Tag Search Enhancer
// @namespace    http://endflow.net/
// @version      0.2.0
// @description  Provide a way to search by multiple tags easily.
// @author       Yuki Kodama <[email protected]>
// @match        http://qiita.com/*
// ==/UserScript==

$('.itemsShowHeaderTags .itemsShowHeaderTags_list')
  .each(function(){
    var tag = $(this).find('.tagIcon_name').text();
    $(this).prepend($('<input type="checkbox" style="margin-right: 8px" data-keyword="tag:' + tag + '"></input>'));
  });

var author = $('.itemsShowAuthorInfo .itemsShowAuthorInfo_userName').text();

$('.itemsShowHeaderTags')
  .append($('<a href="#" type="button" value="Search" class="btn btn-warning btn-xs qtse disabled">Search</a>'))
  .append($('<label class="checkbox-inline" style="margin-left: 8px"><input type="checkbox" data-keyword="user:' + author + '" />Filter by author</label>'))
  .on('change', 'input[type="checkbox"]', function(){
    var keywords = $('.itemsShowHeaderTags input:checked').map(function(){return $(this).data('keyword')}).get();
    $('.itemsShowHeaderTags .btn.qtse')
      .attr('href', '/search?' + $.param({ q: keywords.join(' ') }))
      .toggleClass('disabled', keywords.length == 0);
  });