From 6fc3b624f209f71335bed9947eda956e7d118458 Mon Sep 17 00:00:00 2001
From: joey <joey@0fa5a96a-9a0e-0410-b3b2-a0fd24251071>
Date: Fri, 25 Aug 2006 19:06:37 +0000
Subject: [PATCH] * Generalised preprocesser loop protection code.

---
 IkiWiki/Plugin/inline.pm |  6 ------
 IkiWiki/Render.pm        | 11 ++++++++++-
 debian/changelog         |  3 ++-
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/IkiWiki/Plugin/inline.pm b/IkiWiki/Plugin/inline.pm
index c712f7bb4..e7ec238ed 100644
--- a/IkiWiki/Plugin/inline.pm
+++ b/IkiWiki/Plugin/inline.pm
@@ -22,7 +22,6 @@ sub import { #{{{
 package IkiWiki;
 
 my %toping;
-my @processing_inline;
 
 sub yesno ($) { #{{{
 	my $val=shift;
@@ -32,10 +31,6 @@ sub yesno ($) { #{{{
 sub preprocess_inline (@) { #{{{
 	my %params=@_;
 	
-	# Avoid nested inlines, to avoid loops etc.
-	return "" if grep { $_ eq $params{page} } @processing_inline;
-	push @processing_inline, $params{page};
-
 	if (! exists $params{pages}) {
 		return "";
 	}
@@ -133,7 +128,6 @@ sub preprocess_inline (@) { #{{{
 		$toping{$params{page}}=1 unless $config{rebuild};
 	}
 	
-	pop @processing_inline;
 	return $ret;
 } #}}}
 
diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index f38669728..8e998e8b2 100644
--- 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 (grep { $_ eq $page } @preprocessing) {
+			# Avoid loops of preprocessed pages preprocessing
+			# other pages that preprocess them, etc.
+			return "[[$command would cause preprocessing loop]]";
+		}
 		elsif (exists $hooks{preprocess}{$command}) {
 			# Note: preserve order of params, some plugins may
 			# consider it significant.
@@ -123,11 +129,14 @@ sub preprocess ($$$) { #{{{
 					push @params, $val, '';
 				}
 			}
-			return $hooks{preprocess}{$command}{call}->(
+			push @preprocessing, $page;
+			my $ret=$hooks{preprocess}{$command}{call}->(
 				@params,
 				page => $page,
 				destpage => $destpage,
 			);
+			pop @preprocessing;
+			return $ret;
 		}
 		else {
 			return "[[$command not processed]]";
diff --git a/debian/changelog b/debian/changelog
index 0672428b1..875d4f9a9 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -30,8 +30,9 @@ ikiwiki (1.22) UNRELEASED; urgency=low
   * Use DESTDIR and not PREFIX to specify installation prefix for packaging.
   * Support running "perl Makefile.PL PREFIX=foo" to build ikiwiki to run
     from a different directory.
+  * Generalised preprocesser loop protection code.
 
- -- Joey Hess <joeyh@debian.org>  Thu, 24 Aug 2006 21:28:45 -0400
+ -- Joey Hess <joeyh@debian.org>  Fri, 25 Aug 2006 14:48:36 -0400
 
 ikiwiki (1.21) unstable; urgency=low
 
-- 
2.26.2