Fix #542

lib/gollum/frontend/helpers.rb

@@ -23,5 +23,12 @@ module Precious
       return url if url.nil?
       url.gsub('%2F','/').gsub(/^\/+/,'')
     end
+
+    def trim_leading_slash url
+      return url if url.nil?
+      url.gsub!('%2F','/')
+      return '/' + url.gsub(/^\/+/,'') if url[0,1] == '/'
+      url
+    end
   end
 end

lib/gollum/markup.rb

@@ -411,7 +411,7 @@ module Gollum
         # //page is invalid
         # strip all duplicate forward slashes using helpers.rb clean_url
         # //page => /page
-        # link = one_leading_slash link
+        link = trim_leading_slash link
 
         %{<a class="internal #{presence}" href="#{link}#{extra}">#{name}</a>}
       end

test/test_markup.rb

@@ -56,7 +56,7 @@ context "Markup" do
   #########################################################################
 
   test "absolute link to non-existant page" do
-    @wiki.write_page("linktest", :markdown, "[[/page]]", commit_details)
+    @wiki.write_page("linktest", :markdown, "[[/Page]]", commit_details)
 
     # "<p>a <a class=\"internal absent\" href=\"/Foo\">Foo</a><a class=\"internal absent\" href=\"/Bar\">Bar</a> b</p>"
     page    = @wiki.page("linktest")
@@ -68,7 +68,7 @@ context "Markup" do
     assert_equal 1, anchors.size
     assert_equal 'internal absent', anchors[0]['class']
     assert_equal '/Page',           anchors[0]['href']
-    assert_equal 'Page',            anchors[0].text
+    assert_equal '/Page',            anchors[0].text
   end
 
   test "double page links no space" do