added info

[ikiwiki.git] / IkiWiki / Render.pm

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index f386697287a0d341e74881867162cbd20acc017b..c7849a2dda3c78d123642a233f9fe0347fc9f46d 100644 (file)
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -84,6 +84,7 @@ sub parentlinks ($) { #{{{
        return @ret;
 } #}}}
 
+my %preprocessing;
 sub preprocess ($$$) { #{{{
        my $page=shift; # the page the data comes from
        my $destpage=shift; # the page the data will appear in (different for inline)
@@ -96,6 +97,11 @@ sub preprocess ($$$) { #{{{
                if (length $escape) {
                        return "[[$command $params]]";
                }
+               elsif ($preprocessing{$page}++ > 10) {
+                       # Avoid loops of preprocessed pages preprocessing
+                       # other pages that preprocess them, etc.
+                       return "[[$command preprocessing loop detected on $page at depth $preprocessing{$page}]]";
+               }
                elsif (exists $hooks{preprocess}{$command}) {
                        # Note: preserve order of params, some plugins may
                        # consider it significant.
@@ -123,11 +129,13 @@ sub preprocess ($$$) { #{{{
                                        push @params, $val, '';
                                }
                        }
-                       return $hooks{preprocess}{$command}{call}->(
+                       my $ret=$hooks{preprocess}{$command}{call}->(
                                @params,
                                page => $page,
                                destpage => $destpage,
                        );
+                       $preprocessing{$page}--;
+                       return $ret;
                }
                else {
                        return "[[$command not processed]]";