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{-# LANGUAGE OverloadedStrings #-}
module ConfigFiles where
import Data.ByteString.Lazy.Char8 as L
import System.Posix.User
import System.FilePath
import System.Directory
import System.IO
-- import System.IO.Strict
import System.IO.Error
import Control.Exception
import Control.Monad
import Todo
import Control.DeepSeq
import ByteStringOperators
type User = ByteString
configDir = ".presence"
buddyFile = "buddies"
subscriberFile = "subscribers"
buddyPath :: User -> IO String
buddyPath user = do
ue <- getUserEntryForName (unpack user)
return $ (++("/"++configDir++"/"++buddyFile)) $ homeDirectory ue
subscriberPath :: User -> IO String
subscriberPath user = do
ue <- getUserEntryForName (unpack user)
return $ (++("/"++configDir++"/"++subscriberFile)) $ homeDirectory ue
createConfigFile tag path = do
let dir = dropFileName path
doesDirectoryExist dir >>= flip unless (do
createDirectory dir
)
withFile path WriteMode $ \h ->
L.hPutStrLn h tag
addItem item tag path =
let doit = do
handle (\e -> when (isDoesNotExistError e)
(createConfigFile tag path >> doit))
$ withFile path AppendMode $ \h ->
L.hPutStrLn h item
in doit
addBuddy :: User -> ByteString -> IO ()
addBuddy user buddy =
buddyPath user >>= addItem buddy "<? buddies ?>"
addSubscriber :: User -> ByteString -> IO ()
addSubscriber user subscriber =
subscriberPath user >>= addItem subscriber "<? subscribers ?>"
getConfigList path =
handle (\e -> if isDoesNotExistError e then (return []) else throw e)
$ withFile path ReadMode $
L.hGetContents
>=> return . Prelude.tail . L.lines
>=> (\a -> seq (rnf a) (return a))
getBuddies :: User -> IO [ByteString]
getBuddies user = buddyPath user >>= getConfigList
getSubscribers :: User -> IO [ByteString]
getSubscribers user = subscriberPath user >>= getConfigList
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