Migrate the remaining parts of the exposed API to GhcMod a

Language/Haskell/GhcMod/Boot.hs

@@ -1,27 +1,16 @@
 module Language.Haskell.GhcMod.Boot where
 
-import Control.Applicative ((<$>))
-import CoreMonad (liftIO, liftIO)
+import Control.Applicative
 import Language.Haskell.GhcMod.Browse
 import Language.Haskell.GhcMod.Flag
 import Language.Haskell.GhcMod.Lang
 import Language.Haskell.GhcMod.List
 import Language.Haskell.GhcMod.Monad
-import Language.Haskell.GhcMod.Types
-
--- | Printing necessary information for front-end booting.
-bootInfo :: Options -> IO String
-bootInfo opt = runGhcMod opt $ boot
 
 -- | Printing necessary information for front-end booting.
 boot :: GhcMod String
-boot = do
-    opt   <- options
-    mods  <- modules
-    langs <- liftIO $ listLanguages opt
-    flags <- liftIO $ listFlags opt
-    pre   <- concat <$> mapM browse preBrowsedModules
-    return $ mods ++ langs ++ flags ++ pre
+boot =  concat <$> sequence [modules, languages, flags,
+                             concat <$> mapM browse preBrowsedModules]
 
 preBrowsedModules :: [String]
 preBrowsedModules = [