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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 (when)
import Control.Concurrent.STM
import Control.Exception (handle)
import System.IO (stderr, hPutStrLn)
import Signal
busName :: BusName
busName = busName_ "org.Xmobar.Control"
objectPath :: ObjectPath
objectPath = objectPath_ "/org/Xmobar/Control"
interfaceName :: InterfaceName
interfaceName = interfaceName_ "org.Xmobar.Control"
runIPC :: TMVar SignalType -> IO ()
runIPC mvst = handle printException exportConnection
where
printException :: ClientError -> IO ()
printException = hPutStrLn stderr . clientErrorMessage
exportConnection = do
client <- connectSession
requestName client busName [ nameDoNotQueue ]
export client objectPath [ sendSignalMethod mvst ]
sendSignalMethod :: TMVar 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 )
$ mapM_ (sendSignal . fromVariant) (methodCallBody mc)
return ( replyReturn [] )
sendSignal :: Maybe SignalType -> IO ()
sendSignal = maybe (return ()) (atomically . putTMVar mvst)
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