X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/83876a7da67cab7c76a4754f750e39f32e5702e4..97d0c09a18d9c9b1defb3f4849e04e06745000c7:/IkiWiki/Plugin/trail.pm

diff --git a/IkiWiki/Plugin/trail.pm b/IkiWiki/Plugin/trail.pm
index 330d2a31d..d5fb2b5d6 100644
--- a/IkiWiki/Plugin/trail.pm
+++ b/IkiWiki/Plugin/trail.pm
@@ -26,10 +26,12 @@ sub import {
 # 
 # * $pagestate{$T}{trail}{contents} 
 #   Reference to an array of lists each containing either:
-#     - [link, "link"]
+#     - [pagenames => "page1", "page2"]
+#       Those literal pages
+#     - [link => "link"]
 #       A link specification, pointing to the same page that [[link]]
 #       would select
-#     - [pagespec, "posts/*", "age", 0]
+#     - [pagespec => "posts/*", "age", 0]
 #       A match by pagespec; the third array element is the sort order
 #       and the fourth is whether to reverse sorting
 # 
@@ -60,12 +62,20 @@ sub getsetup () {
 		},
 }
 
+# Cache of pages' old titles, so we can tell whether they changed
+my %old_trail_titles;
+
 sub needsbuild (@) {
 	my $needsbuild=shift;
+
 	foreach my $page (keys %pagestate) {
 		if (exists $pagestate{$page}{trail}) {
 			if (exists $pagesources{$page} &&
 			    grep { $_ eq $pagesources{$page} } @$needsbuild) {
+				# Remember its title, so we can know whether
+				# it changed.
+				$old_trail_titles{$page} = title_of($page);
+
 				# Remove state, it will be re-added
 				# if the preprocessor directive is still
 				# there during the rebuild. {item} is the
@@ -76,6 +86,7 @@ sub needsbuild (@) {
 			}
 		}
 	}
+
 	return $needsbuild;
 }
 
@@ -148,8 +159,8 @@ sub preprocess_trailitems (@) {
 	}
 
 	if (exists $params{pagenames}) {
-		my @list = map { [link =>  $_] } split ' ', $params{pagenames};
-		push @{$pagestate{$params{page}}{trail}{contents}}, @list;
+		push @{$pagestate{$params{page}}{trail}{contents}},
+			[pagenames => (split ' ', $params{pagenames})];
 	}
 
 	return "";
@@ -228,6 +239,12 @@ sub trails_differ {
 		if (! exists $new->{$trail}) {
 			return 1;
 		}
+
+		if (exists $old_trail_titles{$trail} &&
+			title_of($trail) ne $old_trail_titles{$trail}) {
+			return 1;
+		}
+
 		my ($old_p, $old_n) = @{$old->{$trail}};
 		my ($new_p, $new_n) = @{$new->{$trail}};
 		$old_p = "" unless defined $old_p;
@@ -237,9 +254,20 @@ sub trails_differ {
 		if ($old_p ne $new_p) {
 			return 1;
 		}
+
+		if (exists $old_trail_titles{$old_p} &&
+			title_of($old_p) ne $old_trail_titles{$old_p}) {
+			return 1;
+		}
+
 		if ($old_n ne $new_n) {
 			return 1;
 		}
+
+		if (exists $old_trail_titles{$old_n} &&
+			title_of($old_n) ne $old_trail_titles{$old_n}) {
+			return 1;
+		}
 	}
 
 	foreach my $trail (keys %$new) {
@@ -271,6 +299,19 @@ sub prerender {
 					$c->[1], sort => $c->[2],
 					reverse => $c->[3]);
 			}
+			elsif ($c->[0] eq 'pagenames') {
+				my @pagenames = @$c;
+				shift @pagenames;
+				foreach my $page (@pagenames) {
+					if (exists $pagesources{$page}) {
+						push @$members, $page;
+					}
+					else {
+						# rebuild trail if it turns up
+						add_depends($trail, $page, deptype("presence"));
+					}
+				}
+			}
 			elsif ($c->[0] eq 'link') {
 				my $best = bestlink($trail, $c->[1]);
 				push @$members, $best if length $best;
@@ -303,8 +344,6 @@ sub prerender {
 			$prev = $members->[$i - 1] if $i > 0;
 			my $next = $members->[$i + 1];
 
-			add_depends($member, $trail);
-
 			$member_to_trails{$member}{$trail} = [$prev, $next];
 		}
 
@@ -320,7 +359,7 @@ sub prerender {
 		if (exists $pagestate{$member}{trail}{item} &&
 			! exists $member_to_trails{$member}) {
 			$rebuild_trail_members{$member} = 1;
-			delete $pagestate{$member}{trailitem};
+			delete $pagestate{$member}{trail}{item};
 		}
 	}
 
@@ -344,6 +383,12 @@ sub prerender {
 sub build_affected {
 	my %affected;
 
+	# In principle we might not have done this yet, although in practice
+	# at least the trail itself has probably changed, and its template
+	# almost certainly contains TRAILS or TRAILLOOP, triggering our
+	# prerender as a side-effect.
+	prerender();
+
 	foreach my $member (keys %rebuild_trail_members) {
 		$affected{$member} = sprintf(gettext("building %s, its previous or next page has changed"), $member);
 	}
@@ -366,6 +411,8 @@ sub pagetemplate (@) {
 	my $page = $params{page};
 	my $template = $params{template};
 
+	return unless length $page;
+
 	if ($template->query(name => 'trails') && ! $recursive) {
 		prerender();
 
@@ -391,13 +438,11 @@ sub pagetemplate (@) {
 			my ($prevurl, $nexturl, $prevtitle, $nexttitle);
 
 			if (defined $prev) {
-				add_depends($params{destpage}, $prev);
 				$prevurl = urlto($prev, $page);
 				$prevtitle = title_of($prev);
 			}
 
 			if (defined $next) {
-				add_depends($params{destpage}, $next);
 				$nexturl = urlto($next, $page);
 				$nexttitle = title_of($next);
 			}