{-# LANGUAGE OverloadedStrings  #-}

import qualified Data.ByteString as B
import Blaze.ByteString.Builder (toByteStringIO)
import Control.Applicative
import Control.Monad.Trans.Either (runEitherT)
import Heist
import Heist.Compiled (renderTemplate)
import Control.Lens

heistConfig =
  (set hcNamespace "") $
  -- (set hcInterpretedSplices defaultInterpretedSplices) $
  (set hcLoadTimeSplices defaultLoadTimeSplices) $
  (set hcTemplateLocations [loadTemplates "."]) $
  emptyHeistConfig

main = do
    heistState <- either (error "oops") id <$>
         (runEitherT $ initHeist heistConfig)
    builder <- maybe (error "oops") fst $
         renderTemplate heistState "billy"
    toByteStringIO B.putStr builder