Prefill search input with current query

templates/_search.ejs

@@ -8,7 +8,8 @@
     <div class="row" >
       <form method="GET" action="/search" >
         <div class="eight columns" >
-          <input type="text" name="q" value="" class="u-full-width" />
+          <% let search = typeof q == 'undefined' ? '' : q %>
+          <input type="text" name="q" value="<%= search %>" class="u-full-width" />
         </div>
         <div class="four columns" >
           <input type="submit" class="button-primary" value="Search" />