From 6b44cef123af6426a55838707586b6ac95f9db8b Mon Sep 17 00:00:00 2001
From: Jasper Van der Jeugt <jaspervdj@gmail.com>
Date: Thu, 28 Oct 2010 13:32:34 +0200
Subject: Add a takeBody function

---
 src/Text/Hakyll/ContextManipulations.hs | 6 ++++++
 src/Text/Hakyll/Internal/Template.hs    | 8 ++++----
 src/Text/Hakyll/Render.hs               | 6 +++---
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/Text/Hakyll/ContextManipulations.hs b/src/Text/Hakyll/ContextManipulations.hs
index 2ececc6..46ee5ed 100644
--- a/src/Text/Hakyll/ContextManipulations.hs
+++ b/src/Text/Hakyll/ContextManipulations.hs
@@ -9,6 +9,7 @@ module Text.Hakyll.ContextManipulations
     , renderDateWithLocale
     , changeExtension
     , renderBody
+    , takeBody
     ) where
 
 import Control.Monad (liftM)
@@ -115,3 +116,8 @@ changeExtension extension = changeValue "url" changeExtension'
 renderBody :: (String -> String)
            -> HakyllAction Context Context
 renderBody = renderValue "body" "body"
+
+-- | Get the resulting body text from a context
+--
+takeBody :: HakyllAction Context String
+takeBody = arr $ fromMaybe "" . M.lookup "body" . unContext
diff --git a/src/Text/Hakyll/Internal/Template.hs b/src/Text/Hakyll/Internal/Template.hs
index 59235cc..cd6a3bd 100644
--- a/src/Text/Hakyll/Internal/Template.hs
+++ b/src/Text/Hakyll/Internal/Template.hs
@@ -21,6 +21,7 @@ import Text.Hakyll.HakyllAction
 import Text.Hakyll.Pandoc
 import Text.Hakyll.Internal.Cache
 import Text.Hakyll.Page
+import Text.Hakyll.ContextManipulations
 import Text.Hakyll.Internal.Template.Template
 import Text.Hakyll.Internal.Template.Hamlet
 
@@ -56,10 +57,9 @@ readTemplate path = do
   where 
     fileName = "templates" </> path
     readDefaultTemplate = do
-        page <- unContext <$>
-                    runHakyllAction (readPageAction path >>> renderAction)
-        let body = fromMaybe (error $ "No body in template " ++ fileName)
-                             (M.lookup "body" page)
+        body <- runHakyllAction $   readPageAction path
+                                >>> renderAction
+                                >>> takeBody
         return $ fromString body
 
     readHamletTemplate = fromHamletRT <$> readHamletRT path
diff --git a/src/Text/Hakyll/Render.hs b/src/Text/Hakyll/Render.hs
index d054f63..16962bb 100644
--- a/src/Text/Hakyll/Render.hs
+++ b/src/Text/Hakyll/Render.hs
@@ -9,7 +9,7 @@ module Text.Hakyll.Render
     , writePage
     ) where
 
-import Control.Arrow ((>>>))
+import Control.Arrow ((>>>), arr)
 import Control.Applicative ((<$>))
 import Control.Monad.Reader (liftIO)
 import System.Directory (copyFile)
@@ -67,8 +67,8 @@ renderAndConcat templatePaths renderables = HakyllAction
     renders = map (>>> render') renderables
 
     actionFunction' _ = do
-        contexts <- mapM runHakyllAction renders
-        return $ concatMap (fromMaybe "" . M.lookup "body" . unContext) contexts
+        contexts <- mapM (runHakyllAction . (>>> takeBody)) renders
+        return $ concat contexts
 
 -- | Chain a render action for a page with a number of templates. This will
 --   also write the result to the site destination. This is the preferred way
-- 
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