Add blockquote prompts (resolve #489)

_includes/refactor-content.html

@@ -225,6 +225,54 @@
 
 {% assign _content = _heading_content %}
 
+<!-- Wrap prompt element of blockquote with the <div> tag -->
+
+{% assign blockquote_start = '<blockquote class=' %}
+{% assign blockquote_end = '</blockquote>' %}
+{% assign cls_prefix = 'prompt-' %}
+
+{% if _content contains blockquote_start %}
+
+  {% assign _prompt_content = nil %}
+  {% assign _prompt_snippets = _content | split: blockquote_start %}
+
+  {% for _snippet in _prompt_snippets %}
+
+    {% if forloop.first %}
+      {% assign _prompt_content =  _snippet %}
+      {% continue %}
+    {% endif %}
+
+    {% assign left = _snippet | split: blockquote_end | first %}
+    {% assign right = _snippet | slice: left.size, _snippet.size %}
+
+    {% assign cls_str = left | split: '>' | first %}
+    {% assign cls_array = cls_str | remove: '"' | split: ' ' %}
+    {% assign is_prompt = false %}
+
+    {% for cls in cls_array %}
+      {% if cls contains cls_prefix %}
+        {% assign is_prompt = true %}
+        {% break %}
+      {% endif %}
+    {% endfor %}
+
+    {% unless is_prompt %}
+      {% assign _prompt_content = _prompt_content | append: blockquote_start | append: _snippet %}
+      {% continue %}
+    {% endunless %}
+
+    {% assign left = left | slice: cls_str.size, left.size %}
+    {% assign left = cls_str | append: '><div' | append: left | append: '</div>' %}
+
+    {% assign _prompt_content = _prompt_content | append: blockquote_start | append: left | append: right %}
+
+  {% endfor %}
+
+  {% assign _content = _prompt_content %}
+
+{% endif %}
+
 <!-- return -->
 
 {{ _content }}