add reusable babycode editor

views/threads/post.etlua

@@ -54,13 +54,11 @@
       <% if not edit then %>
         <%- post.content %>
       <% else %>
-        <form class="post-edit-form" method="post">
-          <textarea name="new_content" required><%- post.original_markup %></textarea>
-          <span>
-          <input type=submit value="Save">
-          <a class="linkbutton warn" href="<%= url_for("thread", {slug = thread.slug}, {page = page}) .. "#post-" .. post.id %>">Cancel</a>
-          </span>
-        </form>
+        <% render("views.common.babycode-editor", {
+          cancel_url = url_for("thread", {slug = thread.slug}, {page = page}) .. "#post-" .. post.id,
+          prefill = post.original_markup,
+          ta_name = "new_content"
+          }) %>
       <% end %>
     </div>
   </div>