If I have a wiki topic that is named Topic. I have link in that topic to another topic named TopicExample.

In this case the genPdf _fixhtml code gets too greedy trying to create internal links as opposed to external links back to the wiki website.. In particular, on line 364, there is the line..

      $html =~ s/$url(?!#)/#$wikiword/g; # not anchored

In this case, the url is something like http://wiki/twiki/bin/view/MyWeb/Topic The link in the file for TopicExample is http://wiki/twiki/bin/view/MyWeb/TopicExample This matches the above perl line and the first part (everything except Example) gets replaced by $wikiword (Topic in this case), So I end up with a link in the pdf that looks like #TopicExample, not an external link I intended.

My solution for this is to look for beginning and end quotes around the $url and only do the replace if there are quotes around the url.

  $html =~ s/([\'\"])$url\1/\1#$wikiword\1/g; # not anchored

-- TWiki:Main/KevinKalmbach - 01 Feb 2007

Another issue that causes breaks is that TWiki (4.0.5) leaves "<nop>" tags in the output HTML. These aren't needed by htmldoc. More to the point, they can break some of the REs used in GenPDF.pm. This line (in _fixHtml) removes them:

     $html =~ s/<nop>//g