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

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--------------------------------------------------------------------------------
-- | DBus module for DBus brightness controls
module XMonad.Internal.DBus.Brightness.Common
( BrightnessConfig(..)
, BrightnessControls(..)
, brightnessControls
, brightnessExporter
, callGetBrightness
, matchSignal
, signalDep
) where
import Control.Monad (void)
import Data.Int (Int32)
import DBus
import DBus.Client
import DBus.Internal
import qualified DBus.Introspection as I
import XMonad.Core (io)
import XMonad.Internal.DBus.Common
import XMonad.Internal.Dependency
--------------------------------------------------------------------------------
-- | External API
--
-- Define four methods to increase, decrease, maximize, or minimize the
-- brightness. These methods will all return the current brightness as a 32-bit
-- integer and emit a signal with the same brightness value. Additionally, there
-- is one method to get the current brightness.
data BrightnessConfig a b = BrightnessConfig
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{ bcMin :: (a, a) -> IO b
, bcMax :: (a, a) -> IO b
, bcDec :: (a, a) -> IO b
, bcInc :: (a, a) -> IO b
, bcGet :: (a, a) -> IO b
, bcMinRaw :: a
, bcGetMax :: IO a
, bcPath :: ObjectPath
, bcInterface :: InterfaceName
, bcName :: String
}
data BrightnessControls = BrightnessControls
{ bctlMax :: SometimesIO
, bctlMin :: SometimesIO
, bctlInc :: SometimesIO
, bctlDec :: SometimesIO
}
brightnessControls :: XPQuery -> BrightnessConfig a b -> Maybe Client
-> BrightnessControls
brightnessControls q bc client =
BrightnessControls
{ bctlMax = cb "max brightness" memMax
, bctlMin = cb "min brightness" memMin
, bctlInc = cb "increase brightness" memInc
, bctlDec = cb "decrease brightness" memDec
}
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where
cb = callBacklight q client bc
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callGetBrightness :: Num c => BrightnessConfig a b -> Client -> IO (Maybe c)
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callGetBrightness BrightnessConfig { bcPath = p, bcInterface = i } client =
either (const Nothing) bodyGetBrightness
<$> callMethod client xmonadBusName p i memGet
signalDep :: BrightnessConfig a b -> DBusDependency_
signalDep BrightnessConfig { bcPath = p, bcInterface = i } =
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Endpoint xmonadBusName p i $ Signal_ memCur
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matchSignal :: Num c => BrightnessConfig a b -> (Maybe c -> IO ()) -> Client -> IO ()
matchSignal BrightnessConfig { bcPath = p, bcInterface = i } cb =
void . addMatchCallback brMatcher (cb . bodyGetBrightness)
where
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-- TODO add busname to this
brMatcher = matchAny
{ matchPath = Just p
, matchInterface = Just i
, matchMember = Just memCur
}
--------------------------------------------------------------------------------
-- | Internal DBus Crap
brightnessExporter :: RealFrac b => XPQuery -> [IODependency_]
-> BrightnessConfig a b -> Maybe Client -> SometimesIO
brightnessExporter q deps bc@BrightnessConfig { bcName = n } cl =
Sometimes (n ++ " DBus Interface") q [Subfeature root "exporter"]
where
root = DBusRoot_ (exportBrightnessControls' bc) tree cl
tree = listToAnds (Bus xmonadBusName) $ fmap DBusIO deps
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exportBrightnessControls' :: RealFrac b => BrightnessConfig a b -> Client -> IO ()
exportBrightnessControls' bc client = do
maxval <- bcGetMax bc -- assume the max value will never change
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let bounds = (bcMinRaw bc, maxval)
let autoMethod' m f = autoMethod m $ emitBrightness bc client =<< f bc bounds
let funget = bcGet bc
export client (bcPath bc) defaultInterface
{ interfaceName = bcInterface bc
, interfaceMethods =
[ autoMethod' memMax bcMax
, autoMethod' memMin bcMin
, autoMethod' memInc bcInc
, autoMethod' memDec bcDec
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, autoMethod memGet (round <$> funget bounds :: IO Int32)
]
, interfaceSignals = [sig]
}
where
sig = I.Signal
{ I.signalName = memCur
, I.signalArgs =
[
I.SignalArg
{ I.signalArgName = "brightness"
, I.signalArgType = TypeInt32
}
]
}
emitBrightness :: RealFrac b => BrightnessConfig a b -> Client -> b -> IO ()
emitBrightness BrightnessConfig{ bcPath = p, bcInterface = i } client cur =
emit client $ sig { signalBody = [toVariant (round cur :: Int32)] }
where
sig = signal p i memCur
callBacklight :: XPQuery -> Maybe Client -> BrightnessConfig a b -> String
-> MemberName -> SometimesIO
callBacklight q cl BrightnessConfig { bcPath = p
, bcInterface = i
, bcName = n } controlName m =
Sometimes (unwords [n, controlName]) q [Subfeature root "method call"]
where
root = DBusRoot_ cmd (Only_ $ Endpoint xmonadBusName p i $ Method_ m) cl
cmd c = io $ void $ callMethod c xmonadBusName p i m
bodyGetBrightness :: Num a => [Variant] -> Maybe a
bodyGetBrightness [b] = fromIntegral <$> (fromVariant b :: Maybe Int32)
bodyGetBrightness _ = Nothing
--------------------------------------------------------------------------------
-- | DBus Members
memCur :: MemberName
memCur = memberName_ "CurrentBrightness"
memGet :: MemberName
memGet = memberName_ "GetBrightness"
memMax :: MemberName
memMax = memberName_ "MaxBrightness"
memMin :: MemberName
memMin = memberName_ "MinBrightness"
memInc :: MemberName
memInc = memberName_ "IncBrightness"
memDec :: MemberName
memDec = memberName_ "DecBrightness"