If draft name has rfcXXXX-bis or rfcXXXXbis then add rfcXXXX to diff context menu. Fixes ietf-tools#460 (7 years old ticket). Commit ready for merge

 - Legacy-Id: 14374

Author: kivinen

ietf/doc/templatetags/ietf_filters.py

@@ -536,3 +536,8 @@ def role_names(roles):
 @register.filter()
 def zaptmp(s):
     return re.sub(r'/tmp/tmp[^/]+/', '', s)
+
+@register.filter()
+def rfcbis(s):
+    m = re.search('^.*-rfc(\d+)-?bis(-.*)?$', s)
+    return None if m is None else 'rfc' + m.group(1) 

ietf/templates/doc/document_history.html

@@ -36,6 +36,11 @@ <h2>Revision differences</h2>
 	        ({{ time|date:"Y-m-d" }})
 	      </option>
 	    {% endfor %}
+	    {% if doc.name|rfcbis %}
+	      <option value="{{ doc.name|rfcbis }}">
+	        {{ doc.name|rfcbis }}
+	      </option>
+	    {% endif %}
           </select>
         </div>
       </div>
@@ -52,6 +57,11 @@ <h2>Revision differences</h2>
 	        ({{ time|date:"Y-m-d" }})
 	      </option>
 	    {% endfor %}
+	    {% if doc.name|rfcbis %}
+	      <option value="{{ doc.name|rfcbis }}">
+	        {{ doc.name|rfcbis }}
+	      </option>
+	    {% endif %}
           </select>
         </div>
       </div>