nitiwiki: fix a bug where multiple independent trails could have been merged

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/contrib/nitiwiki/src/wiki_html.nit b/contrib/nitiwiki/src/wiki_html.nit
index 05c06f9..8042af6 100644 (file)
--- 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>"