xmonad-config/lib/XMonad/Internal/DBus/Common.hs

52 lines
1.5 KiB
Haskell

--------------------------------------------------------------------------------
-- | Common internal DBus functions
module XMonad.Internal.DBus.Common
( callMethod
, callMethod'
, addMatchCallback
, xmonadBus
, initControls
) where
import DBus
import DBus.Client
import XMonad.Internal.Dependency
xmonadBus :: BusName
xmonadBus = busName_ "org.xmonad"
-- | Call a method and return its result if successful
callMethod :: MethodCall -> IO (Maybe [Variant])
callMethod mc = do
client <- connectSession
r <- callMethod' client (Just xmonadBus) mc
disconnect client
return r
callMethod' :: Client -> Maybe BusName -> MethodCall -> IO (Maybe [Variant])
callMethod' client bn mc = do
-- TODO handle clienterrors here
reply <- call client mc { methodCallDestination = bn }
-- TODO not all methods warrant that we wait for a reply? (see callNoReply)
return $ case reply of
Left _ -> Nothing
Right ret -> Just $ methodReturnBody ret
-- | Bind a callback to a signal match rule
addMatchCallback :: MatchRule -> ([Variant] -> IO ()) -> IO SignalHandler
addMatchCallback rule cb = do
client <- connectSession
addMatch client rule $ cb . signalBody
initControls :: Client -> (Client -> Feature (IO ()) (IO ()))
-> (Feature (IO ()) (IO ()) -> IO a) -> IO a
initControls client exporter controls = do
let x = exporter client
e <- evalFeature x
case e of
(Installed c _) -> c
_ -> return ()
controls x