Worked on CompressCSS module.

hakyll.cabal

@@ -19,7 +19,7 @@ library
   ghc-options: -Wall
   hs-source-dirs: src/
   build-depends:   base >= 4 && < 5, template, filepath, directory, containers, bytestring,
-                   pandoc >= 1
+                   pandoc >= 1, regex-compat
   exposed-modules: Text.Hakyll.Render
                    Text.Hakyll.Renderable
                    Text.Hakyll.Renderables

src/Text/Hakyll/CompressCSS.hs

@@ -3,10 +3,21 @@ module Text.Hakyll.CompressCSS
     ) where
 
 import Data.List
+import Text.Regex
 
 -- | Compress CSS to speed up your site.
 compressCSS :: String -> String
-compressCSS = stripComments
+compressCSS = compressSeparators
+            . compressWhitespace
+            . stripComments
+
+-- | Compresses certain forms of separators.
+compressSeparators :: String -> String
+compressSeparators str = subRegex (mkRegex "\\s*([;:])\\s*") str "\\1"
+
+-- | Compresses all whitespace.
+compressWhitespace :: String -> String
+compressWhitespace str = subRegex (mkRegex "\\s\\s*") str " "
 
 -- | Function that strips CSS comments away.
 stripComments :: String -> String