support long answers

templates/single_choice/viewer.stpl

@@ -6,6 +6,14 @@
 
 <canvas id="myChart"></canvas>
 
+<% if answers.iter().any(|x| x.len() > 4) { %>
+  <ol>
+      <% for answer in answers.iter() { %>
+        <li><h4><%= answer %></h4></li>
+      <% } %>
+  </ol>
+<% } %>
+
 
 <script>
     var ctx = document.getElementById('myChart');
@@ -13,9 +21,15 @@
       type: 'bar',
       data: {
         labels: [
+          <% if answers.iter().any(|x| x.len() > 4) { %>
+            <% for answer in answers.iter().enumerate().map(|(i, _)| i+1) { %>
+              "<%= answer %>",
+            <% } %>
+          <% } else { %>
             <% for answer in answers.iter() { %>
               "<%= answer %>",
             <% } %>
+          <% } %>
         ],
 <% if show_result { %>
         datasets: [