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|
-----------------------------------------------------------------------------
-- |
-- Module : DBus
-- Copyright : (c) Jochen Keil
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jochen Keil <jochen dot keil at gmail dot com>
-- Stability : unstable
-- Portability : unportable
--
-- DBus IPC module for Xmobar
--
-----------------------------------------------------------------------------
module IPC.DBus ( runIPC ) where
import DBus
import DBus.Client
import Control.Monad ((>=>), join, when)
import Control.Concurrent
import Signal
safeHead :: [a] -> Maybe a
safeHead [] = Nothing
safeHead (x:_) = Just x
instance IsVariant SignalType where
toVariant = toVariant . show
fromVariant = fromVariant >=> parseSignalType
parseSignalType :: String -> Maybe SignalType
parseSignalType = fmap fst . safeHead . reads
busName :: BusName
busName = busName_ "org.Xmobar.Control"
objectPath :: ObjectPath
objectPath = objectPath_ "/org/Xmobar/Control"
interfaceName :: InterfaceName
interfaceName = interfaceName_ "org.Xmobar.Control"
runIPC :: MVar SignalType -> IO ()
runIPC mvst = do
client <- connectSession
requestName client busName [ nameDoNotQueue ]
export client objectPath [ sendSignalMethod mvst ]
sendSignalMethod :: MVar SignalType -> Method
sendSignalMethod mvst = method interfaceName sendSignalName
(signature_ [variantType $ toVariant $ (undefined :: SignalType)])
(signature_ [])
sendSignalMethodCall
where
sendSignalName :: MemberName
sendSignalName = memberName_ "SendSignal"
sendSignalMethodCall :: MethodCall -> IO Reply
sendSignalMethodCall mc = do
when ( methodCallMember mc == sendSignalName ) $ sendSignal $
join $ safeHead $ map fromVariant $ methodCallBody mc
return ( replyReturn [] )
sendSignal :: Maybe SignalType -> IO ()
sendSignal = maybe (return ()) (putMVar mvst)
|
