{- Config file handling by jgoerzen

 Copyright (c) 2005 Jesper Louis Andersen <jlouis@mongers.org>

 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
 copyright notice and this permission notice appear in all copies.

 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

-}
-----------------------------------------------------------------------------
-- |
-- Module      :  Config
-- Copyright   :  (c) Jesper Louis Andersen, 2005
-- License     :  BSD-style (see the file libraries/base/LICENSE)
-- 
-- Maintainer  :  jgoerzen\@complete.org
-- Stability   :  Highly Experimental code
-- Portability :  portable
-- 
-- Configuration file support for Conjure.
-- The configuration file supported here is versatile, supports
-- string interpolation, comments, multi-line fields, sections,
-- and defaults.  See 
-- <http://quux.org/devel/missingh/html/MissingH-ConfigParser.html>
-- for more details.
-----------------------------------------------------------------------------
module Config
  (
   readCfg,
   getRarestFirstCutoffPoint
  )
where

import MissingH.ConfigParser
import System.Directory(getHomeDirectory, doesFileExist)
import MissingH.Either(forceEither)

defaultCP :: ConfigParser
defaultCP = forceEither $
            set (emptyCP {accessfunc = interpolatingAccess 10})
            "DEFAULT" "rarest_first_cutoff_point" "10"
readCfg :: IO ConfigParser
readCfg =
    do homedir <- getHomeDirectory
       let cfgfile = homedir ++ "/.conjure"
       exists <- doesFileExist cfgfile
       if exists
          then do val <- readfile defaultCP cfgfile
                  return $ forceEither val
          else return defaultCP


getRarestFirstCutoffPoint :: ConfigParser -> Int
getRarestFirstCutoffPoint cp =
    case get cp "main" "rarest_first_cutoff_point" of
      Left x -> error $ "Couldn't find rarest_first_cutoff_point: " ++ (show x)
      Right y -> y