Alternative snippet highlighting using a templatetag which might work better than having it on-save.

pastebin/apps/dpaste/templates/dpaste/snippet_details.html

@@ -49,7 +49,7 @@
         <table>
             <tr>
                 <th><pre class="code">{% for l in lines %}<a href="#l{{ forloop.counter }}" id="l{{ forloop.counter }}">{{ forloop.counter }}</a>{% endfor %}</pre></th>
-                <td><pre class="code">{% for line in snippet.content_splitted %}<div class="line" id="l{{ forloop.counter }}">{% if line %}{{ line|safe }}{% else %}&nbsp;{% endif %}</div>{% endfor %}</pre></td>
+                <td><pre class="code">{% for line in snippet|highlight %}<div class="line" id="l{{ forloop.counter }}">{% if line %}{{ line|safe }}{% else %}&nbsp;{% endif %}</div>{% endfor %}</pre></td>
             </tr>
         </table>
         </div>

pastebin/apps/dpaste/templatetags/dpaste_tags.py

@@ -1,7 +1,17 @@
 from django.template import Library
+from django.utils.safestring import mark_safe
+
+from pastebin.apps.dpaste.highlight import pygmentize
 
 register = Library()
 
 @register.filter
 def in_list(value,arg):
     return value in arg
+
+@register.filter
+def highlight(snippet):
+    h = pygmentize(snippet.content, snippet.lexer)
+    if not h:
+        return snippet.content.splitlines()
+    return h.splitlines()