From 93f4d06007686b4ed265d85b01a3ef04a716bb05 Mon Sep 17 00:00:00 2001
From: Jean Privat <jean@pryen.org>
Date: Sat, 28 Nov 2015 16:10:35 -0500
Subject: [PATCH] nitiwiki: fix a bug where multiple independent trails could
 have been merged

Signed-off-by: Jean Privat <jean@pryen.org>
---
 contrib/nitiwiki/src/wiki_html.nit |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/contrib/nitiwiki/src/wiki_html.nit b/contrib/nitiwiki/src/wiki_html.nit
index 05c06f9..8042af6 100644
--- a/contrib/nitiwiki/src/wiki_html.nit
+++ b/contrib/nitiwiki/src/wiki_html.nit
@@ -313,17 +313,21 @@ redef class WikiArticle
 
 		var res = new Template
 		res.add "<ul class=\"trail\">"
-		if pos > 0 then
-			var target = flat[pos-1]
-			res.add "<li>{target.a_from(self, "prev")}</li>"
-		end
 		var parent = wiki.trails.parent(self)
+		# Up and prev are disabled on a root
 		if parent != null then
+			if pos > 0 then
+				var target = flat[pos-1]
+				res.add "<li>{target.a_from(self, "prev")}</li>"
+			end
 			res.add "<li>{parent.a_from(self, "up")}</li>"
 		end
 		if pos < flat.length - 1 then
 			var target = flat[pos+1]
-			res.add "<li>{target.a_from(self, "next")}</li>"
+			# Only print the next if it is not a root
+			if target.parent != null then
+				res.add "<li>{target.a_from(self, "next")}</li>"
+			end
 		end
 		res.add "</ul>"
 
-- 
1.7.9.5