From ba1dfb4ec665f95b4f4217360e08109bcbf7f41b Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@gnu.kitenet.net>
Date: Tue, 6 Oct 2009 18:09:46 -0400
Subject: [PATCH] fix support of a single dependency that combines links and
 exists types

This is very common, and the code has to test each type differently, since
the list of candidates to test, as well as the test, will vary per type.
Much happier with this code now.
---
 IkiWiki/Render.pm | 65 +++++++++++++++++++++++++++++------------------
 1 file changed, 40 insertions(+), 25 deletions(-)

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index e86314107..8f9cbf673 100644
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -545,38 +545,53 @@ sub render_dependent ($$$$$$$) {
 		}
 	
 		if (exists $depends{$p} && ! defined $reason) {
-			D: foreach my $d (keys %{$depends{$p}}) {
-				my $sub=pagespec_translate($d);
+			foreach my $dep (keys %{$depends{$p}}) {
+				my $sub=pagespec_translate($dep);
 				next if $@ || ! defined $sub;
 
 				# only consider internal files
 				# if the page explicitly depends
 				# on such files
-				my $internal_dep=$d =~ /internal\(/;
-
-				my @candidates;
-				if ($depends{$p}{$d} & $IkiWiki::DEPEND_PRESENCE) {
-					@candidates=@exists_changed;
- 					push @candidates, @$internal_new, @$internal_del
-						if $internal_dep;
-				}
-				if (($depends{$p}{$d} & ($IkiWiki::DEPEND_CONTENT | $IkiWiki::DEPEND_LINKS))) {
-					@candidates=@changed;
-					push @candidates, @$internal_new, @$internal_del, @$internal_changed
-						if $internal_dep;
-				}
-
-				foreach my $file (@candidates) {
-					next if $file eq $f;
-					my $page=pagename($file);
-					if ($sub->($page, location => $p)) {
-						if ($depends{$p}{$d} & $IkiWiki::DEPEND_LINKS &&
-						    ! $depends{$p}{$d} & $IkiWiki::DEPEND_CONTENT) {
-							next unless $linkchangers->{lc($page)};
+				my $internal_dep=$dep =~ /internal\(/;
+
+				my $in=sub {
+					my $list=shift;
+					my $type=shift;
+					foreach my $file ($list) {
+						next if $file eq $f;
+						my $page=pagename($file);
+						if ($sub->($page, location => $p)) {
+							if ($type == $IkiWiki::DEPEND_LINKS) {
+								next unless $linkchangers->{lc($page)};
+							}
+							return $page;
 						}
-						$reason = $page;
-						last D;
 					}
+					return undef;
+				};
+
+				if ($depends{$p}{$dep} & $IkiWiki::DEPEND_CONTENT) {
+					last if $reason =
+						$in->(\@changed, $IkiWiki::DEPEND_CONTENT);
+					last if $internal_dep && ($reason =
+						$in->($internal_new, $IkiWiki::DEPEND_CONTENT) ||
+						$in->($internal_del, $IkiWiki::DEPEND_CONTENT) ||
+						$in->($internal_changed, $IkiWiki::DEPEND_CONTENT));
+				}
+				if ($depends{$p}{$dep} & $IkiWiki::DEPEND_PRESENCE) {
+					last if $reason = 
+						$in->(\@exists_changed, $IkiWiki::DEPEND_PRESENCE);
+					last if $internal_dep && ($reason =
+						$in->($internal_new, $IkiWiki::DEPEND_PRESENCE) ||
+						$in->($internal_del, $IkiWiki::DEPEND_PRESENCE));
+				}
+				if ($depends{$p}{$dep} & $IkiWiki::DEPEND_LINKS) {
+					last if $reason =
+						$in->(\@changed, $IkiWiki::DEPEND_LINKS);
+					last if $internal_dep && ($reason =
+						$in->($internal_new, $IkiWiki::DEPEND_LINKS) ||
+						$in->($internal_del, $IkiWiki::DEPEND_LINKS) ||
+						$in->($internal_changed, $IkiWiki::DEPEND_LINKS));
 				}
 			}
 		}
-- 
2.26.2