112 lines
3.1 KiB
Haskell
112 lines
3.1 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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--------------------------------------------------------------------------------
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-- | DBus module for X11 screensave/DPMS control
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module XMonad.Internal.DBus.Screensaver
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( exportScreensaver
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, callToggle
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, callQuery
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, matchSignal
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) where
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import Control.Monad (void)
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import DBus
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import DBus.Client
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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
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import XMonad.Internal.Process
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--------------------------------------------------------------------------------
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-- | Low-level functions
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type SSState = Bool -- true is enabled
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toggle :: IO SSState
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toggle = do
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st <- query
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-- TODO figure out how not to do this with shell commands
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void $ createProcess' $ proc "xset" $ "s" : args st
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-- TODO this assumes the command succeeds
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return $ not st
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where
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args s = if s then ["off", "-dpms"] else ["on", "+dpms"]
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query :: IO SSState
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query = do
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dpy <- openDisplay ""
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xssi <- xScreenSaverQueryInfo dpy
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closeDisplay dpy
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return $ case xssi of
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Just XScreenSaverInfo { xssi_state = ScreenSaverDisabled } -> False
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Just XScreenSaverInfo { xssi_state = _ } -> True
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-- TODO handle errors better (at least log them?)
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Nothing -> False
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--------------------------------------------------------------------------------
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-- | DBus Interface
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--
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-- Define a methods to toggle the screensaver. This methods will emit signal
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-- with the new state when called. Define another method to get the current
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-- state.
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path :: ObjectPath
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path = "/screensaver"
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interface :: InterfaceName
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interface = "org.xmonad.Screensaver"
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memState :: MemberName
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memState = "State"
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memToggle :: MemberName
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memToggle = "Toggle"
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memQuery :: MemberName
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memQuery = "Query"
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sigCurrentState :: Signal
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sigCurrentState = signal path interface memState
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ruleCurrentState :: MatchRule
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ruleCurrentState = matchAny
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{ matchPath = Just path
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, matchInterface = Just interface
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, matchMember = Just memState
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}
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emitState :: Client -> SSState -> IO ()
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emitState client sss = emit client $ sigCurrentState { signalBody = [toVariant sss] }
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bodyGetCurrentState :: [Variant] -> Maybe SSState
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bodyGetCurrentState [b] = fromVariant b :: Maybe SSState
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bodyGetCurrentState _ = Nothing
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--------------------------------------------------------------------------------
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-- | Exported haskell API
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exportScreensaver :: Client -> IO ()
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exportScreensaver client =
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export client path defaultInterface
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{ interfaceName = interface
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, interfaceMethods =
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[ autoMethod memToggle $ emitState client =<< toggle
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, autoMethod memQuery query
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]
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}
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callToggle :: IO ()
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callToggle = void $ callMethod $ methodCall path interface memToggle
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callQuery :: IO (Maybe SSState)
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callQuery = do
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reply <- callMethod $ methodCall path interface memQuery
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return $ reply >>= bodyGetCurrentState
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matchSignal :: (Maybe SSState -> IO ()) -> IO SignalHandler
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matchSignal cb = addMatchCallback ruleCurrentState $ cb . bodyGetCurrentState
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