1 The graphviz.pm plug-in currently attempts to read PNG data in UTF-8 mode, which sometimes fail with a message similar to the following (depending on the input):
3 utf8 "\x89" does not map to Unicode at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 53, <IN> chunk 1.
4 Wide character in subroutine entry at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 68.
6 It also generates image URLs relative to the page being rendered, which means the URLs wont work when previewing a graph from the CGI script.
8 The patch below fixes these two issues.
10 --- graphviz.pm.orig Thu Jun 7 15:45:16 2007
11 +++ graphviz.pm Fri Jun 8 12:03:38 2007
12 @@ -41,7 +41,6 @@ sub render_graph (\%) { #{{{
13 $pid=open2(*IN, *OUT, "$params{prog} -Tpng");
15 # open2 doesn't respect "use open ':utf8'"
16 - binmode (IN, ':utf8');
17 binmode (OUT, ':utf8');
20 @@ -70,7 +69,12 @@ sub render_graph (\%) { #{{{
24 - return "<img src=\"".urlto($dest, $params{page})."\" />\n";
25 + if ($params{preview}) {
26 + return "<img src=\"".urlto($dest, "")."\" />\n";
29 + return "<img src=\"".urlto($dest, $params{page})."\" />\n";