From 29907c6c870933ec1031fa6499ea9994c96f7aa6 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 29 Mar 2015 01:36:42 +0100
Subject: extract-title.hs now only writes title to stdout

---
 build/extract-title.hs | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/build/extract-title.hs b/build/extract-title.hs
index a84442e..4582657 100755
--- a/build/extract-title.hs
+++ b/build/extract-title.hs
@@ -1,16 +1,25 @@
 #!/usr/bin/env runhaskell
 
+-- import Text.Pandoc.Pretty
+-- import Text.Pandoc.JSON
 import Text.Pandoc.Pretty
 import Text.Pandoc.JSON
+import qualified Text.Pandoc.Walk as W
 import System.IO
+import qualified Data.Aeson as A
+import qualified Data.ByteString.Lazy as BL
 
-extract_title :: Pandoc -> IO Pandoc
-extract_title d@(Pandoc m _) = do hPutStrLn stderr $ (++) "title: " $ render Nothing $ cat $ map pretty (docTitle m)
-                                  return d
-  where pretty :: Inline -> Doc
-        pretty (Str s) = text s
-        pretty Space = space
-        pretty _ = empty
+extract_title :: Pandoc -> String
+extract_title d@(Pandoc m _) = do
+  title <- render Nothing $ cat $ map pretty (docTitle m)
+  return title
+    where pretty :: Inline -> Doc
+          pretty (Str s) = text s
+          pretty Space = space
+          pretty _ = empty
 
 main :: IO ()
-main = toJSONFilter extract_title
+main = do
+  input <- BL.getContents
+  let title = (W.query extract_title :: Pandoc -> String) . either error id . A.eitherDecode' $ input
+  putStrLn title
-- 
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