Added getValue function.

src/Text/Hakyll/Page.hs

@@ -1,6 +1,7 @@
 module Text.Hakyll.Page 
     ( Page,
       fromContext,
+      getValue,
       copyValueWith,
       getBody,
       readPage,
@@ -29,6 +30,11 @@ data Page = Page (M.Map B.ByteString B.ByteString)
 fromContext :: (M.Map B.ByteString B.ByteString) -> Page
 fromContext = Page
 
+-- | Obtain a value from a page. Will resturn an empty string when nothing is
+--   found.
+getValue :: String -> Page -> B.ByteString
+getValue str (Page page) = fromMaybe B.empty $ M.lookup (B.pack str) page
+
 -- | Do something with a value of the page.
 copyValueWith :: String -- ^ Key of which the value should be copied.
               -> String -- ^ Key the value should be copied to.