Server.hs

-- | Implements a basic static file server for previewing options
--
{-# LANGUAGE OverloadedStrings #-}
module Hakyll.Web.Preview.Server
    ( staticServer
    ) where

import Control.Monad.Trans (liftIO)

import qualified Snap.Core as Snap
import qualified Snap.Http.Server as Snap
import qualified Snap.Util.FileServe as Snap

-- | Serve a given directory
--
static :: FilePath             -- ^ Directory to serve
       -> (FilePath -> IO ())  -- ^ Pre-serve hook
       -> Snap.Snap ()
static directory preServe =
    Snap.serveDirectoryWith directoryConfig directory
  where
    directoryConfig :: Snap.DirectoryConfig Snap.Snap
    directoryConfig = Snap.fancyDirectoryConfig
        { Snap.preServeHook = liftIO . preServe
        }

-- | Main method, runs a static server in the given directory
--
staticServer :: FilePath             -- ^ Directory to serve
             -> (FilePath -> IO ())  -- ^ Pre-serve hook
             -> Int                  -- ^ Port to listen on
             -> IO ()                -- ^ Blocks forever
staticServer directory preServe port =
    Snap.httpServe config $ static directory preServe
  where
    -- Snap server config
    config = Snap.setPort      port
           $ Snap.setAccessLog Snap.ConfigNoLog
           $ Snap.setErrorLog  Snap.ConfigNoLog
           $ Snap.emptyConfig