added gloabl metadata parsing

src/Hakyll/Core/Provider/Metadata.hs

@@ -20,6 +20,8 @@ import           System.IO                     as IO
 import           Text.Parsec                   ((<?>))
 import qualified Text.Parsec                   as P
 import           Text.Parsec.String            (Parser)
+import           System.FilePath.Posix
+import           Control.Monad                  (liftM)
 
 
 --------------------------------------------------------------------------------
@@ -28,7 +30,7 @@ import           Hakyll.Core.Metadata
 import           Hakyll.Core.Provider.Internal
 import           Hakyll.Core.Util.Parser
 import           Hakyll.Core.Util.String
-
+import           Hakyll.Core.Identifier.Pattern
 
 --------------------------------------------------------------------------------
 loadMetadata :: Provider -> Identifier -> IO (Metadata, Maybe String)
@@ -42,7 +44,9 @@ loadMetadata p identifier = do
         Nothing  -> return M.empty
         Just mi' -> loadMetadataFile $ resourceFilePath p mi'
 
-    return (M.union md emd, body)
+    gmd <- loadGlobalMetadata p fp
+
+    return (M.unions [md, emd, gmd], body)
   where
     normal = setVersion Nothing identifier
     fp     = resourceFilePath p identifier
@@ -133,3 +137,40 @@ page = do
     metadata' <- P.option [] metadataBlock
     body      <- P.many P.anyChar
     return (metadata', body)
+
+
+--------------------------------------------------------------------------------
+-- | Load directory-wise metadata
+loadGlobalMetadata :: Provider -> FilePath -> IO (M.Map String String)
+loadGlobalMetadata p fp = do
+    let dir = takeDirectory fp
+    liftM M.fromList $ loadgm dir
+    where 
+        loadgm :: FilePath -> IO [(String, String)]
+        loadgm dir | dir == providerDirectory p = return []
+                   | otherwise = do
+            let mfp = combine dir "metadata"
+            md <- if M.member (fromFilePath $ normalise mfp) (providerFiles p) 
+                    then loadOne mfp dir 
+                    else return []
+            others <- loadgm (takeDirectory dir)
+            return $ others ++ md 
+        loadOne mfp dir = do
+            contents <- IO.readFile mfp
+            return $ case P.parse namedMetadata mfp contents of
+                        Left err -> error (show err)
+                        Right mds -> findMetadata mds dir
+        findMetadata mds dir = 
+            concatMap snd $ filter (flip matches (fromFilePath fp) . fromGlob . combine dir . fst) mds
+
+namedMetadata :: Parser [(String, [(String, String)])]
+namedMetadata = P.many namedMetadataBlock
+
+namedMetadataBlock :: Parser (String, [(String, String)])
+namedMetadataBlock = do
+    name      <- P.many1 (P.char '-') *> P.many inlineSpace *> P.manyTill P.anyChar newline
+    metadata' <- metadata
+    P.skipMany P.space
+    return (name, metadata')
+
+