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

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--------------------------------------------------------------------------------
-- | DBus module for X11 screensave/DPMS control
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module XMonad.Internal.DBus.Screensaver
( exportScreensaver
, callToggle
, callQuery
, matchSignal
, ssSignalDep
) where
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import Control.Monad (void)
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import DBus
import DBus.Client
import qualified DBus.Introspection as I
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import Graphics.X11.XScreenSaver
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import Graphics.X11.Xlib.Display
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import XMonad.Internal.DBus.Common
import XMonad.Internal.Dependency
import XMonad.Internal.Process
--------------------------------------------------------------------------------
-- | Low-level functions
type SSState = Bool -- true is enabled
ssExecutable :: String
ssExecutable = "xset"
toggle :: IO SSState
toggle = do
st <- query
-- TODO figure out how not to do this with shell commands
void $ createProcess' $ proc ssExecutable $ "s" : args st
-- TODO this assumes the command succeeds
return $ not st
where
args s = if s then ["off", "-dpms"] else ["on", "+dpms"]
query :: IO SSState
query = do
dpy <- openDisplay ""
xssi <- xScreenSaverQueryInfo dpy
closeDisplay dpy
return $ case xssi of
Just XScreenSaverInfo { xssi_state = ScreenSaverDisabled } -> False
Just XScreenSaverInfo { xssi_state = _ } -> True
-- TODO handle errors better (at least log them?)
Nothing -> False
--------------------------------------------------------------------------------
-- | DBus Interface
--
-- Define a methods to toggle the screensaver. This methods will emit signal
-- with the new state when called. Define another method to get the current
-- state.
ssPath :: ObjectPath
ssPath = objectPath_ "/screensaver"
interface :: InterfaceName
interface = interfaceName_ "org.xmonad.Screensaver"
memState :: MemberName
memState = memberName_ "State"
memToggle :: MemberName
memToggle = memberName_ "Toggle"
memQuery :: MemberName
memQuery = memberName_ "Query"
sigCurrentState :: Signal
sigCurrentState = signal ssPath interface memState
ruleCurrentState :: MatchRule
ruleCurrentState = matchAny
{ matchPath = Just ssPath
, matchInterface = Just interface
, matchMember = Just memState
}
emitState :: Client -> SSState -> IO ()
emitState client sss = emit client $ sigCurrentState { signalBody = [toVariant sss] }
bodyGetCurrentState :: [Variant] -> Maybe SSState
bodyGetCurrentState [b] = fromVariant b :: Maybe SSState
bodyGetCurrentState _ = Nothing
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--------------------------------------------------------------------------------
-- | Exported haskell API
exportScreensaver :: Maybe Client -> FeatureIO
exportScreensaver client = Feature
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{ ftrAction = DBusTree (Single cmd) client [Bus xmonadBusName] [Executable ssExecutable]
, ftrName = "screensaver interface"
, ftrWarning = Default
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}
where
cmd cl = export cl ssPath defaultInterface
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{ interfaceName = interface
, interfaceMethods =
[ autoMethod memToggle $ emitState cl =<< toggle
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, autoMethod memQuery query
]
, interfaceSignals = [sig]
}
sig = I.Signal
{ I.signalName = memState
, I.signalArgs =
[
I.SignalArg
{ I.signalArgName = "enabled"
, I.signalArgType = TypeBoolean
}
]
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}
callToggle :: Maybe Client -> FeatureIO
callToggle client =
(featureEndpoint xmonadBusName ssPath interface memToggle client)
{ ftrName = "screensaver toggle" }
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callQuery :: Client -> IO (Maybe SSState)
callQuery client = do
reply <- callMethod client xmonadBusName ssPath interface memQuery
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return $ either (const Nothing) bodyGetCurrentState reply
matchSignal :: (Maybe SSState -> IO ()) -> IO SignalHandler
matchSignal cb = addMatchCallback ruleCurrentState $ cb . bodyGetCurrentState
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ssSignalDep :: DBusDep
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ssSignalDep = Endpoint xmonadBusName ssPath interface $ Signal_ memState