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diff --git a/src/Haddock/Interface.hs b/src/Haddock/Interface.hs
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+-------------------------------------------------------------------------------
+-- Haddock.Interface
+--
+-- Here we build the actual module interfaces. By interface we mean the 
+-- information which is used to render a Haddock page for a module. Parts of 
+-- this information is also stored in the interface files.
+--
+-- The HaddockModule structure holds the interface data as well as 
+-- intermediate information needed during its creation.
+-------------------------------------------------------------------------------
+
+
+module Haddock.Interface (
+  createInterfaces
+) where
+
+
+import Haddock.Interface.Create
+import Haddock.Interface.AttachInstances
+import Haddock.Interface.Rename
+import Haddock.Types
+import Haddock.Options
+import Haddock.GHC.Utils
+
+import qualified Data.Map as Map
+import Data.Map (Map)
+import Data.List
+import Control.Monad.Writer
+import Control.Monad
+
+import Name
+
+
+-- | Turn a topologically sorted list of GhcModules into interfaces. Also
+-- return the home link environment created in the process, and any error
+-- messages.
+createInterfaces :: [GhcModule] -> LinkEnv -> [Flag] -> 
+                    ([HaddockModule], LinkEnv, [ErrMsg])
+createInterfaces modules extLinks flags = (interfaces, homeLinks, messages)
+  where 
+    ((interfaces, homeLinks), messages) = runWriter $ do
+      -- part 1, create the interfaces
+      interfaces <- createInterfaces' modules flags
+      -- part 2, attach the instances
+      let interfaces' = attachInstances interfaces
+      -- part 3, rename the interfaces
+      renameInterfaces interfaces' extLinks
+
+
+createInterfaces' :: [GhcModule] -> [Flag] -> ErrMsgM [HaddockModule]
+createInterfaces' modules flags = do
+  resultMap <- foldM addInterface Map.empty modules
+  return (Map.elems resultMap)
+  where
+    addInterface :: ModuleMap -> GhcModule -> ErrMsgM ModuleMap
+    addInterface map mod = do
+      interface <- createInterface mod flags map
+      return $ Map.insert (hmod_mod interface) interface map
+
+ 
+renameInterfaces :: [HaddockModule] -> LinkEnv -> 
+                    ErrMsgM ([HaddockModule], LinkEnv)
+renameInterfaces interfaces externalLinks = do
+  let homeLinks = buildHomeLinks interfaces
+  let links = homeLinks `Map.union` externalLinks
+  interfaces' <- mapM (renameInterface links) interfaces
+  return (interfaces', homeLinks)
+
+-- | Build a mapping which for each original name, points to the "best"
+-- place to link to in the documentation.  For the definition of
+-- "best", we use "the module nearest the bottom of the dependency
+-- graph which exports this name", not including hidden modules.  When
+-- there are multiple choices, we pick a random one.
+-- 
+-- The interfaces are passed in in topologically sorted order, but we start
+-- by reversing the list so we can do a foldl.
+buildHomeLinks :: [HaddockModule] -> LinkEnv
+buildHomeLinks modules = foldl upd Map.empty (reverse modules)
+  where
+    upd old_env mod
+      | OptHide    `elem` hmod_options mod = old_env
+      | OptNotHome `elem` hmod_options mod =
+        foldl' keep_old old_env exported_names
+      | otherwise = foldl' keep_new old_env exported_names
+      where
+        exported_names = hmod_visible_exports mod
+        modName = hmod_mod mod
+
+        keep_old env n = Map.insertWith (\new old -> old) n
+                         (nameSetMod n modName) env
+        keep_new env n = Map.insert n (nameSetMod n modName) env