95 lines
3.0 KiB
Haskell
95 lines
3.0 KiB
Haskell
--------------------------------------------------------------------------------
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-- | Common internal DBus functions
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module XMonad.Internal.DBus.Common
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( addMatchCallback
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, getDBusClient
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, withDBusClient
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, withDBusClient_
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, withDBusClientConnection_
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, matchProperty
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, xmonadBusName
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, matchPropertyChanged
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, SignalMatch(..)
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, callPropertyGet
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) where
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import Control.Exception
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import Control.Monad
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import qualified Data.Map.Strict as M
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import DBus
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import DBus.Client
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xmonadBusName :: BusName
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xmonadBusName = busName_ "org.xmonad"
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-- | Bind a callback to a signal match rule
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addMatchCallback :: MatchRule -> ([Variant] -> IO ()) -> Client -> IO ()
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addMatchCallback rule cb client = void $ addMatch client rule $ cb . signalBody
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getDBusClient :: Bool -> IO (Maybe Client)
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getDBusClient sys = do
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res <- try $ if sys then connectSystem else connectSession
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case res of
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Left e -> putStrLn (clientErrorMessage e) >> return Nothing
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Right c -> return $ Just c
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withDBusClient :: Bool -> (Client -> a) -> IO (Maybe a)
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withDBusClient sys f = do
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client <- getDBusClient sys
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let r = f <$> client
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mapM_ disconnect client
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return r
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withDBusClient_ :: Bool -> (Client -> IO ()) -> IO ()
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withDBusClient_ sys f = do
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client <- getDBusClient sys
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mapM_ f client
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mapM_ disconnect client
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withDBusClientConnection_ :: Bool -> (Client -> IO ()) -> IO ()
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withDBusClientConnection_ sys f = do
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client <- getDBusClient sys
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mapM_ f client
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propertyInterface :: InterfaceName
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propertyInterface = interfaceName_ "org.freedesktop.DBus.Properties"
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propertySignal :: MemberName
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propertySignal = memberName_ "PropertiesChanged"
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matchProperty :: ObjectPath -> MatchRule
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matchProperty p = matchAny
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-- NOTE: the sender for signals is usually the unique name (eg :X.Y) not the
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-- requested name (eg "org.something.understandable"). If sender is included
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-- here, likely nothing will match. Solution is to somehow get the unique
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-- name, which I could do, but probably won't
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{ matchPath = Just p
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, matchInterface = Just propertyInterface
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, matchMember = Just propertySignal
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}
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data SignalMatch a = Match a | NoMatch | Failure deriving (Eq, Show)
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matchPropertyChanged :: InterfaceName -> String -> (Variant -> Maybe a)
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-> [Variant] -> SignalMatch a
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matchPropertyChanged iface property f [i, body, _] =
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let i' = (fromVariant i :: Maybe String)
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b = toMap body in
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case (i', b) of
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(Just i'', Just b') -> if i'' == formatInterfaceName iface then
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maybe NoMatch Match $ f =<< M.lookup property b'
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else NoMatch
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_ -> Failure
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where
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toMap v = fromVariant v :: Maybe (M.Map String Variant)
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matchPropertyChanged _ _ _ _ = Failure
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callPropertyGet :: BusName -> ObjectPath -> InterfaceName -> String -> Client
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-> IO [Variant]
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callPropertyGet bus path iface property client = either (const []) (:[])
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<$> getProperty client (methodCall path iface $ memberName_ property)
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{ methodCallDestination = Just bus }
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