From cca5cb0a5e3071f1ce77688d0b5b9df42135c5b2 Mon Sep 17 00:00:00 2001
From: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Date: Fri, 15 Feb 2013 22:43:50 +0100
Subject: [PATCH] trail: no 'up' page if it's a member of the trail
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When a trail includes its index page among the members, the pages
before/after it will have “double links” to the index page (both as
next/prev and as 'up') and the index page will include an 'up' link to
itself.

Prevent this by not defining the appropriate template variables when the
index page is member of the trail itself. The default page template is
also adapted to skip the link at all in this case.
---
 IkiWiki/Plugin/trail.pm | 17 +++++++++++++----
 templates/page.tmpl     |  2 ++
 templates/trails.tmpl   |  2 ++
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/IkiWiki/Plugin/trail.pm b/IkiWiki/Plugin/trail.pm
index d5fb2b5d6..45b53d4b5 100644
--- a/IkiWiki/Plugin/trail.pm
+++ b/IkiWiki/Plugin/trail.pm
@@ -447,17 +447,26 @@ sub pagetemplate (@) {
 				$nexttitle = title_of($next);
 			}
 
-			push @trails, {
+			my %trail_info = (
 				prevpage => $prev,
 				prevtitle => $prevtitle,
 				prevurl => $prevurl,
 				nextpage => $next,
 				nexttitle => $nexttitle,
 				nexturl => $nexturl,
-				trailpage => $trail,
-				trailtitle => title_of($trail),
-				trailurl => urlto($trail, $page),
+			);
+
+			# the trail index is added as 'up' page, but only if it's
+			# not a page in the trail itself. This allows the definition of
+			# up-less trails by using e.g. the trailitems directive in one of the
+			# pages of the trail
+			unless ($trail ~~ @$members) {
+				$trail_info{trailpage} = $trail;
+				$trail_info{trailtitle} = title_of($trail);
+				$trail_info{trailurl} = urlto($trail, $page);
 			};
+
+			push @trails, \%trail_info;
 		}
 
 		$template->param(trailloop => \@trails);
diff --git a/templates/page.tmpl b/templates/page.tmpl
index 89b4f3a06..50f244003 100644
--- a/templates/page.tmpl
+++ b/templates/page.tmpl
@@ -31,7 +31,9 @@
 <TMPL_IF PREVPAGE>
 <link rel="prev" href="<TMPL_VAR PREVURL>" title="<TMPL_VAR PREVTITLE>" />
 </TMPL_IF>
+<TMPL_IF TRAILURL>
 <link rel="up" href="<TMPL_VAR TRAILURL>" title="<TMPL_VAR TRAILTITLE>" />
+</TMPL_IF>
 <TMPL_IF NEXTPAGE>
 <link rel="next" href="<TMPL_VAR NEXTURL>" title="<TMPL_VAR NEXTTITLE>" />
 </TMPL_IF>
diff --git a/templates/trails.tmpl b/templates/trails.tmpl
index 54c046043..89d737e99 100644
--- a/templates/trails.tmpl
+++ b/templates/trails.tmpl
@@ -8,9 +8,11 @@
 <span class="trailsep">|</span>
 </span>
 </TMPL_IF>
+<TMPL_IF TRAILURL>
 <span class="trailup">
 <a href="<TMPL_VAR TRAILURL>"><TMPL_VAR TRAILTITLE></a>
 </span>
+</TMPL_IF>
 <TMPL_IF NEXTPAGE>
 <span class="trailnext">
 <span class="trailsep">|</span>
-- 
2.39.2