Fix and improve external_filter

Author: MasterEnoc

assets/javascripts/lib/page.coffee

@@ -178,16 +178,20 @@ onclick = (event) ->
   link = $.eventTarget(event)
   link = link.parentNode while link and link.tagName isnt 'A'
 
-  if link and not link.target and isSameOrigin(link.href)
+  if link and not link.target and isSameOrigin(link.href) and not isSameOriginDifferentDoc
     event.preventDefault()
     path = link.pathname + link.search + link.hash
     path = path.replace /^\/\/+/, '/' # IE11 bug
     page.show(path)
+
   return
 
 isSameOrigin = (url) ->
   url.indexOf("#{location.protocol}//#{location.hostname}") is 0
 
+isSameOriginDifferentDoc = (url) ->
+  url.pathname == location.pathname
+
 updateCanonicalLink = ->
   @canonicalLink ||= document.head.querySelector('link[rel="canonical"]')
   @canonicalLink.setAttribute('href', "https://#{location.host}#{location.pathname}")

lib/docs/core/filter.rb

@@ -96,15 +96,5 @@ def clean_path(path)
       path = path.gsub %r{\+}, '_plus_'
       path
     end
-
-    def path_to_root
-      if subpath == ''
-        return '../'
-      else
-        previous_dirs = subpath.scan(/\//)
-        return '../' * previous_dirs.length
-      end
-    end
-
   end
 end

lib/docs/filters/core/external_urls.rb

@@ -6,8 +6,6 @@ class ExternalUrlsFilter < Filter
     def call
       if context[:external_urls]
 
-        root = path_to_root
-
         css('a').each do |node|
 
           next unless anchorUrl = node['href']
@@ -24,7 +22,7 @@ def call
 
           context[:external_urls].each do |host, name|
             if url.host.to_s.match?(host)
-              node['href'] = root + name + url.path.to_s + '#' + url.fragment.to_s
+              node['href'] = '/' + name + url.path.to_s + '#' + url.fragment.to_s
             end
           end