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Given every comment of a threaded comment system is stored as a separate topic you could be tempted to rendered things using a call like

%<nop>INCLUDE{"RenderSubComments" NAME="TestTopic"}%

where RenderSubComments is defined as

        type="regex" nonoise="on" order="created" reverse="on"
          <div class=\"subComments\">
             $topic$percntINCLUDE{\"RenderSubComments\" NAME=\"$topic\"}$percnt

and comments are linked to each other by a Ref formfield entry.

Each call to RenderSubComment will be done with a different NAME parameter, thus this construction will always terminate.

Alas, this desired behaviour is not possible as TWiki::_INCLUDE only checks for web.topic being included already. The attached patch adds the parameters and its values to the stack entry of already included topics, so that we only get an "already included" warning if there really is an infinite loop.

Btw. why do I have to nop the INCLUDE and SEARCH in the above example?

Here's the patch in action rendering blog comments recursively.



  • Approve, subject to parameters being sorted before they are stacked. -- CrawfordCurrie - 27 Sep 2005
  • Approve as long as Crawford's concern is addressed. Seems like logical necessity to make feature work as expected. -- LB
  • Approve. this actually seems more like a bugfix. -- WN

i applied the following (adjusted patch) to SVN:6725

Index: TWiki.pm
--- TWiki.pm    (revision 6719)
+++ TWiki.pm    (working copy)
@@ -2433,7 +2433,12 @@
         } # else fail silently
         return '';
+    # compute include key
     $path = $incweb.'.'.$inctopic;
+    foreach my $k ( sort keys %$params ) {
+       $path .= ":$k=$params->{$k}";
+    }

     # prevent recursive includes. Note that the inclusion of a topic into
     # itself is not blocked; however subsequent attempts to include the


MD, please check this patch and close if appropriate. WN

MD is very happy with recusive INCLUDESs and even feels save again since Item666 is done.

Summary can't INCLUDE topic recursively with different parameters
ReportedBy MichaelDaum
AppliesTo Engine
Priority Enhancement
CurrentState Closed

Checkins 6725
Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formatdiff TWiki_pm.diff r0 manage 0.5 K 2005-09-26 - 14:16 UnknownUser  
Edit | Attach | Watch | Print version | History: r8 < r7 < r6 < r5 < r4 | Backlinks | Raw View |  Raw edit | More topic actions
Topic revision: r8 - 2005-10-14 - MichaelDaum
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