improve escaping of wikilinks and preprocessor directives

The old method failed for '[' x 3.

IkiWiki/Plugin/aggregate.pm

@@ -610,7 +610,7 @@ sub add_page (@) { #{{{
 	my $template=template($feed->{template}, blind_cache => 1);
 	$template->param(title => $params{title})
 		if defined $params{title} && length($params{title});
-	$template->param(content => htmlescape(htmlabs($params{content},
+	$template->param(content => wikiescape(htmlabs($params{content},
 		defined $params{base} ? $params{base} : $feed->{feedurl})));
 	$template->param(name => $feed->{name});
 	$template->param(url => $feed->{url});
@@ -637,11 +637,9 @@ sub add_page (@) { #{{{
 	}
 } #}}}
 
-sub htmlescape ($) { #{{{
+sub wikiescape ($) { #{{{
 	# escape accidental wikilinks and preprocessor stuff
-	my $html=shift;
-	$html=~s/(?<!\\)\[\[/\\\[\[/g;
-	return $html;
+	return encode_entities(shift, '\[\]');
 } #}}}
 
 sub urlabs ($$) { #{{{

IkiWiki/Plugin/recentchanges.pm

@@ -5,6 +5,7 @@ use warnings;
 use strict;
 use IkiWiki 2.00;
 use Encode;
+use HTML::Entities;
 
 sub import { #{{{
 	hook(type => "getsetup", id => "recentchanges", call => \&getsetup);
@@ -163,7 +164,7 @@ sub store ($$$) { #{{{
 	if (ref $change->{message}) {
 		foreach my $field (@{$change->{message}}) {
 			if (exists $field->{line}) {
-				$field->{line} =~ s/(?<!\\)\[\[/\\\[\[/g;
+				$field->{line} = encode_entities($field->{line}, '\[\]');
 			}
 		}
 	}

IkiWiki/Plugin/recentchangesdiff.pm

@@ -4,6 +4,7 @@ package IkiWiki::Plugin::recentchangesdiff;
 use warnings;
 use strict;
 use IkiWiki 2.00;
+use HTML::Entities;
 
 my $maxlines=200;
 
@@ -39,7 +40,7 @@ sub pagetemplate (@) { #{{{
 				$diff=join("", @lines);
 			}
 			# escape links and preprocessor stuff
-			$diff =~ s/(?<!\\)\[\[/\\\[\[/g;
+			$diff = encode_entities($diff, '\[\]');
 			$template->param(diff => $diff);
 		}
 	}

debian/changelog

@@ -3,6 +3,8 @@ ikiwiki (2.71) UNRELEASED; urgency=low
   * htmlbalance: New plugin contributed by Simon McVittie.
   * Change deb dependencies to list Text::Markdown before markdown (really
     this time).
+  * Improve escaping of wikilinks and preprocessor directives in content
+    produced by aggregate and recentchanges.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 17 Nov 2008 14:02:10 -0500