From c6bf4228d5c988e715ff08a9374b72ce054daa2c Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@gnu.kitenet.net>
Date: Mon, 5 Oct 2009 15:01:05 -0400
Subject: [PATCH] make links dependencies fire if broken links change

---
 IkiWiki/Render.pm      | 41 ++++++++++++++++++++++++++++-------------
 doc/plugins/write.mdwn |  6 ++++--
 2 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index 4e8aae3bc..599bb26e2 100644
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -63,24 +63,39 @@ sub find_changed_links (@_) {
 	my %linkchangers;
 	foreach my $file (@_) {
 		my $page=pagename($file);
-		
+	
 		if (exists $links{$page}) {
-			foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
-				if (length $link &&
-				    (! exists $oldlinks{$page} ||
-				     ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {
-					$linkchanged{$link}=1;
-					$linkchangers{lc($page)}=1;
+			foreach my $l (@{$links{$page}}) {
+				my $link=bestlink($page, $l);
+				if (length $link) {
+					if (! exists $oldlinks{$page} ||
+					    ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}}) {
+						$linkchanged{$link}=1;
+						$linkchangers{lc($page)}=1;
+					}
+				}
+				else {
+					if (! grep { lc $_ eq lc $l } @{$oldlinks{$page}}) {
+						$linkchangers{lc($page)}=1
+					}
 				}
+				
 			}
 		}
 		if (exists $oldlinks{$page}) {
-			foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
-				if (length $link &&
-				    (! exists $links{$page} || 
-				     ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {
-					$linkchanged{$link}=1;
-					$linkchangers{lc($page)}=1;
+			foreach my $l (@{$oldlinks{$page}}) {
+				my $link=bestlink($page, $l);
+				if (length $link) {
+					if (! exists $links{$page} || 
+					    ! grep { bestlink($page, $_) eq $link } @{$links{$page}}) {
+						$linkchanged{$link}=1;
+						$linkchangers{lc($page)}=1;
+					}
+				}
+				else {
+					if (! grep { lc $_ eq lc $l } @{$links{$page}}) {
+						$linkchangers{lc($page)}=1
+					}
 				}
 			}
 		}
diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 73db6f12a..133030f08 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -620,8 +620,10 @@ used to indicate weaker types of dependencies:
 
 * `presence` if set to true, only the presence of a matching page triggers
   the dependency.
-* `links` if set to true, any change in the text of links on a matching page
-  triggers the dependency
+* `links` if set to true, any change to links on a matching page
+  triggers the dependency. This includes when a link is added, removed,
+  or changes what it points to due to other changes. It does not include
+  the addition or removal of a duplicate link.
 
 #### `pagespec_match($$;@)`
 
-- 
2.45.0