From a85224a68b51b70035446ad8e5565d571c4a10d4 Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Wed, 17 Jun 2015 22:22:49 +0200
Subject: Implement hyperlinking of imported module names.

---
 .../src/Haddock/Backends/Hyperlinker/Renderer.hs   | 28 +++++++++++++---------
 1 file changed, 17 insertions(+), 11 deletions(-)

(limited to 'haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs')

diff --git a/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs b/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
index e08d8974..70524759 100644
--- a/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
+++ b/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
@@ -8,6 +8,7 @@ import qualified Name as GHC
 import qualified Unique as GHC
 
 import Data.List
+import Data.Maybe
 import Data.Monoid
 
 import Text.XHtml (Html, HtmlAttr, (!))
@@ -86,20 +87,25 @@ internalAnchorIdent :: GHC.Name -> String
 internalAnchorIdent = ("local-" ++) . show . GHC.getKey . GHC.nameUnique
 
 hyperlink :: TokenDetails -> Html -> Html
-hyperlink details =
-    if GHC.isInternalName $ name
-    then internalHyperlink name
-    else externalHyperlink name
-  where
-    name = rtkName details
+hyperlink details = case rtkName details of
+    Left name ->
+        if GHC.isInternalName name
+        then internalHyperlink name
+        else externalHyperlink mname (Just name)
+      where
+        mname = GHC.moduleName <$> GHC.nameModule_maybe name
+    Right name -> externalHyperlink (Just name) Nothing
 
 internalHyperlink :: GHC.Name -> Html -> Html
 internalHyperlink name content =
     Html.anchor content ! [ Html.href $ "#" ++ internalAnchorIdent name ]
 
-externalHyperlink :: GHC.Name -> Html -> Html
-externalHyperlink name content =
-    Html.anchor content ! [ Html.href $ maybe "" id mmod ++ ".html#" ++ ident ]
+externalHyperlink :: Maybe GHC.ModuleName -> Maybe GHC.Name -> Html -> Html
+externalHyperlink mmname miname content =
+    Html.anchor content ! [ Html.href $ path ++ anchor ]
   where
-    mmod = GHC.moduleNameString . GHC.moduleName <$> GHC.nameModule_maybe name
-    ident = externalAnchorIdent name
+    path = fromMaybe "" $ modulePath <$> mmname
+    anchor = fromMaybe "" $ ("#" ++) . externalAnchorIdent <$> miname
+
+modulePath :: GHC.ModuleName -> String
+modulePath name = GHC.moduleNameString name ++ ".html"
-- 
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