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{-# LANGUAGE OverloadedStrings #-}
module ConfigFiles where
import Data.ByteString.Lazy.Char8 as L
import System.Posix.User
import System.Posix.Files (fileExist)
import System.FilePath
import System.Directory
import System.IO
-- import System.IO.Strict
import System.IO.Error
import Control.Exception
import Control.Monad
import Control.DeepSeq
import ByteStringOperators () -- For NFData instance
import ControlMaybe
import Data.List (partition)
import Data.Maybe (catMaybes,isJust)
type User = ByteString
configDir = ".presence"
buddyFile = "buddies"
subscriberFile = "subscribers"
otherFile = "others"
pendingFile = "pending"
solicitedFile = "solicited"
configPath :: User -> String -> IO String
configPath user filename = do
ue <- getUserEntryForName (unpack user)
return $ (++("/"++configDir++"/"++filename)) $ homeDirectory ue
createConfigFile tag path = do
let dir = dropFileName path
doesDirectoryExist dir >>= flip unless (do
createDirectory dir
)
withFile path WriteMode $ \h -> do
L.hPutStrLn h tag
addItem item tag path =
let doit = do
handle (\e -> when (isDoesNotExistError e)
(createConfigFile tag path >> doit))
$ do exists <- fileExist path
if exists
then withFile path AppendMode $ \h ->
L.hPutStrLn h item
else withFile path WriteMode $ \h -> do
L.hPutStrLn h tag
L.hPutStrLn h item
in doit
modifyFile ::
(ByteString,FilePath)
-> ByteString
-> (ByteString -> IO (Maybe ByteString))
-> Maybe ByteString
-> IO Bool -- Returns True if test function ever returned Nothing
modifyFile (tag,file) user test appending = configPath user file >>= doit
where
doit path = do
handle (\e -> if (isDoesNotExistError e)
then (createConfigFile tag path >> doit path)
else return False)
$ do exists <- fileExist path
if exists
then do
xs <- withFile path ReadMode $ \h -> do
contents <- L.hGetContents h
case L.lines contents of
x:xs -> mapM test xs
_ -> return []
let (keepers,deleted) = partition isJust xs
withFile path WriteMode $ \h -> do
L.hPutStrLn h tag
forM_ (catMaybes keepers) (L.hPutStrLn h)
withJust appending (L.hPutStrLn h)
return . not . Prelude.null $ deleted
else do
withFile path WriteMode $ \h -> do
L.hPutStrLn h tag
withJust appending (L.hPutStrLn h)
return False
modifySolicited = modifyFile ("<? solicited ?>", solicitedFile)
modifyBuddies = modifyFile ("<? buddies ?>" , buddyFile)
modifyOthers = modifyFile ("<? others ?>" , otherFile)
addBuddy :: User -> ByteString -> IO ()
addBuddy user buddy =
configPath user buddyFile >>= addItem buddy "<? buddies ?>"
addSubscriber :: User -> ByteString -> IO ()
addSubscriber user subscriber =
configPath user subscriberFile >>= addItem subscriber "<? subscribers ?>"
addSolicited :: User -> ByteString -> IO ()
addSolicited user solicited =
configPath user solicitedFile >>= addItem solicited "<? solicited ?>"
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 = configPath user buddyFile >>= getConfigList
getSubscribers :: User -> IO [ByteString]
getSubscribers user = configPath user subscriberFile >>= getConfigList
getOthers :: User -> IO [ByteString]
getOthers user = configPath user otherFile >>= getConfigList
getPending :: User -> IO [ByteString]
getPending user = configPath user pendingFile >>= getConfigList
getSolicited :: User -> IO [ByteString]
getSolicited user = configPath user solicitedFile >>= getConfigList
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