Proper string trimming.

src/Text/Hakyll/Page.hs

@@ -18,6 +18,7 @@ import Data.Maybe
 import System.FilePath
 import System.IO
 
+import Text.Hakyll.Util
 import Text.Pandoc
 
 -- | A Page is basically key-value mapping. Certain keys have special
@@ -27,7 +28,6 @@ type Page = M.Map String PageValue
 -- | We use a ByteString for obvious reasons.
 type PageValue = B.ByteString
 
-
 -- | Add a key-value mapping to the Page.
 addContext :: String -> String -> Page -> Page
 addContext key value = M.insert key (B.pack value)
@@ -61,8 +61,8 @@ readMetaData handle = do
     line <- hGetLine handle
     if isDelimiter line then return []
                         else do others <- readMetaData handle
-                                return $ (trim . break (== ':')) line : others
-        where trim (key, value) = (key, dropWhile (`elem` ": ") value)
+                                return $ (trimPair . break (== ':')) line : others
+        where trimPair (key, value) = (trim key, trim $ tail value)
 
 isDelimiter :: String -> Bool
 isDelimiter = L.isPrefixOf "---"

src/Text/Hakyll/Util.hs

@@ -1,11 +1,13 @@
 module Text.Hakyll.Util 
     ( makeDirectories,
-      getRecursiveContents
+      getRecursiveContents,
+      trim
     ) where
 
 import System.Directory
 import System.FilePath
 import Control.Monad
+import Data.Char
 
 -- | Given a path to a file, try to make the path writable by making
 --   all directories on the path.
@@ -27,3 +29,8 @@ getRecursiveContents topdir = do
             else return [path]
     return (concat paths)
     where isProper = not . (== '.') . head
+
+-- | Trim a string (drop spaces and tabs at both sides).
+trim :: String -> String
+trim = reverse . trim' . reverse . trim'
+    where trim' = dropWhile isSpace