xmonad-config/lib/Xmobar/Plugins/Bluetooth.hs

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--------------------------------------------------------------------------------
-- | Bluetooth plugin
--
-- Use the bluez interface on DBus to check status
--
-- org.bluez dynamically updates its DBus interfaces using the standard Object
-- Manager. The adapter is located at path "/org/bluez/hci<X>" where X is
-- usually 0, and each device is "/org/bluez/hci<X>/<MAC_ADDRESS>".
--
-- This plugin will reflect if the adapter is powered and if any device is
-- connected to it. The rough outline for this procedure:
-- 1) get the adapter from the object manager
-- 2) get all devices associated with the adapter using the object interface
-- 3) determine if the adapter is powered
-- 4) determine if any devices are connected
-- 5) format the icon; powered vs not powered controls the color and connected
-- vs not connected controls the icon (connected bluetooth symbol has two
-- dots flanking it)
--
-- Step 3 can be accomplished using the "org.bluez.Adapter1" interface and
-- querying the "Powered" property. Step 4 can be done using the
-- "org.bluez.Device1" interface and the "Connected" property for each device
-- path. Since these are properties, we can asynchronously read changes to them
-- via the "PropertiesChanged" signal.
--
-- If any devices are added/removed, steps 2-4 will need to be redone and any
-- listeners will need to be updated. (TODO not sure which signals to use in
-- determining if a device is added)
--
-- TODO also not sure if I need to care about multiple adapters and/or the
-- adapter changing.
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module Xmobar.Plugins.Bluetooth
( Bluetooth(..)
, btAlias
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, btDep
) where
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import Control.Concurrent.MVar
import Control.Monad
import Data.List
import Data.List.Split
import qualified Data.Map as M
import Data.Maybe
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import DBus
import DBus.Client
import DBus.Internal
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import XMonad.Internal.Dependency
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import Xmobar
import Xmobar.Plugins.Common
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btAlias :: String
btAlias = "bluetooth"
btDep :: DBusDep
btDep = Endpoint btBus btOmPath omInterface $ Method_ getManagedObjects
data Bluetooth = Bluetooth Icons Colors deriving (Read, Show)
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instance Exec Bluetooth where
alias (Bluetooth _ _) = btAlias
start (Bluetooth icons colors) cb =
withDBusClientConnection True cb $ startAdapter icons colors cb
startAdapter :: Icons -> Colors -> Callback -> Client -> IO ()
startAdapter is cs cb cl = do
ot <- getBtObjectTree cl
state <- newMVar emptyState
let display = displayIcon cb (iconFormatter is cs) state
forM_ (findAdapter ot) $ \adapter -> do
-- set up adapter
initAdapter state adapter cl
addAdaptorListener state display adapter cl
-- set up devices on the adapter (and listeners for adding/removing devices)
let devices = findDevices adapter ot
addDeviceAddedListener state display adapter cl
addDeviceRemovedListener state display adapter cl
forM_ devices $ \d -> addAndInitDevice state display d cl
-- after setting things up, show the icon based on the initialized state
display
--------------------------------------------------------------------------------
-- | Icon Display
--
-- Color corresponds to the adaptor powered state, and the icon corresponds to
-- if it is paired or not. If the adaptor state is undefined, display "N/A"
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type IconFormatter = (Maybe Bool -> Bool -> String)
type Icons = (String, String)
type Colors = (String, String)
displayIcon :: Callback -> IconFormatter -> MutableBtState -> IO ()
displayIcon callback formatter =
callback . uncurry formatter <=< readState
-- TODO maybe I want this to fail when any of the device statuses are Nothing
iconFormatter :: Icons -> Colors -> IconFormatter
iconFormatter (iconConn, iconDisc) (colorOn, colorOff) powered connected =
maybe na (chooseColor icon colorOn colorOff) powered
where
icon = if connected then iconConn else iconDisc
--------------------------------------------------------------------------------
-- | Connection State
--
-- The signal handlers all run on separate threads, yet the icon depends on
-- the state reflected by all these signals. The best (only?) way to do this is
-- is to track the shared state of the bluetooth adaptor and its devices using
-- an MVar.
data BTDevice = BTDevice
{ btDevConnected :: Maybe Bool
, btDevSigHandler :: SignalHandler
}
type ConnectedDevices = M.Map ObjectPath BTDevice
data BtState = BtState
{ btDevices :: ConnectedDevices
, btPowered :: Maybe Bool
}
type MutableBtState = MVar BtState
emptyState :: BtState
emptyState = BtState
{ btDevices = M.empty
, btPowered = Nothing
}
readState :: MutableBtState -> IO (Maybe Bool, Bool)
readState state = do
p <- readPowered state
c <- readDevices state
return (p, anyDevicesConnected c)
--------------------------------------------------------------------------------
-- | Object manager
findAdapter :: ObjectTree -> Maybe ObjectPath
findAdapter = find (("/org/bluez/hci" `isPrefixOf`) . formatObjectPath) . M.keys
findDevices :: ObjectPath -> ObjectTree -> [ObjectPath]
findDevices adapter = filter (adaptorHasDevice adapter) . M.keys
adaptorHasDevice :: ObjectPath -> ObjectPath -> Bool
adaptorHasDevice adaptor device = case splitPath device of
[org, bluez, hciX, _] -> splitPath adaptor == [org, bluez, hciX]
_ -> False
splitPath :: ObjectPath -> [String]
splitPath = splitOn "/" . dropWhile (=='/') . formatObjectPath
getBtObjectTree :: Client -> IO ObjectTree
getBtObjectTree client = callGetManagedObjects client btBus btOmPath
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btBus :: BusName
btBus = busName_ "org.bluez"
btOmPath :: ObjectPath
btOmPath = objectPath_ "/"
addDeviceAddedListener :: MutableBtState -> IO () -> ObjectPath -> Client -> IO ()
addDeviceAddedListener state display adapter client =
addInterfaceAddedListener btOmPath addDevice client
where
addDevice = pathCallback adapter display $ \d ->
addAndInitDevice state display d client
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addDeviceRemovedListener :: MutableBtState -> IO () -> ObjectPath -> Client -> IO ()
addDeviceRemovedListener state display adapter client =
addInterfaceRemovedListener btOmPath remDevice client
where
remDevice = pathCallback adapter display $ \d -> do
old <- removeDevice state d
forM_ old $ removeMatch client . btDevSigHandler
pathCallback :: ObjectPath -> IO () -> (ObjectPath -> IO ()) -> SignalCallback
pathCallback adapter display f [device, _] = forM_ (fromVariant device) $ \d ->
when (adaptorHasDevice adapter d) $ f d >> display
pathCallback _ _ _ _ = return ()
--------------------------------------------------------------------------------
-- | Adapter
initAdapter :: MutableBtState -> ObjectPath -> Client -> IO ()
initAdapter state adapter client = do
reply <- callGetPowered adapter client
putPowered state $ fromSingletonVariant reply
addAdaptorListener :: MutableBtState -> IO () -> ObjectPath -> Client -> IO ()
addAdaptorListener state display adaptor =
void . addMatchCallback rule (procMatch . matchPowered)
where
rule = matchProperty adaptor
procMatch = withSignalMatch $ \b -> putPowered state b >> display
callGetPowered :: ObjectPath -> Client -> IO [Variant]
callGetPowered adapter =
callPropertyGet btBus adapter adapterInterface adaptorPowered
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matchPowered :: [Variant] -> SignalMatch Bool
matchPowered = matchPropertyChanged adapterInterface adaptorPowered
putPowered :: MutableBtState -> Maybe Bool -> IO ()
putPowered m ds = modifyMVar_ m (\s -> return s { btPowered = ds })
readPowered :: MutableBtState -> IO (Maybe Bool)
readPowered = fmap btPowered . readMVar
adapterInterface :: InterfaceName
adapterInterface = interfaceName_ "org.bluez.Adapter1"
adaptorPowered :: String
adaptorPowered = "Powered"
--------------------------------------------------------------------------------
-- | Devices
addAndInitDevice :: MutableBtState -> IO () -> ObjectPath -> Client -> IO ()
addAndInitDevice state display device client = do
sh <- addDeviceListener state display device client
initDevice state sh device client
initDevice :: MutableBtState -> SignalHandler -> ObjectPath -> Client -> IO ()
initDevice state sh device client = do
reply <- callGetConnected device client
void $ insertDevice state device $
BTDevice { btDevConnected = fromVariant =<< listToMaybe reply
, btDevSigHandler = sh
}
addDeviceListener :: MutableBtState -> IO () -> ObjectPath -> Client -> IO SignalHandler
addDeviceListener state display device =
addMatchCallback rule (procMatch . matchConnected)
where
rule = matchProperty device
procMatch = withSignalMatch $ \c -> updateDevice state device c >> display
matchConnected :: [Variant] -> SignalMatch Bool
matchConnected = matchPropertyChanged devInterface devConnected
callGetConnected :: ObjectPath -> Client -> IO [Variant]
callGetConnected p = callPropertyGet btBus p devInterface devConnected
insertDevice :: MutableBtState -> ObjectPath -> BTDevice -> IO Bool
insertDevice m device dev = modifyMVar m $ \s -> do
let new = M.insert device dev $ btDevices s
return (s { btDevices = new }, anyDevicesConnected new)
updateDevice :: MutableBtState -> ObjectPath -> Maybe Bool -> IO Bool
updateDevice m device status = modifyMVar m $ \s -> do
let new = M.update (\d -> Just d { btDevConnected = status }) device $ btDevices s
return (s { btDevices = new }, anyDevicesConnected new)
anyDevicesConnected :: ConnectedDevices -> Bool
anyDevicesConnected = or . mapMaybe btDevConnected . M.elems
removeDevice :: MutableBtState -> ObjectPath -> IO (Maybe BTDevice)
removeDevice m device = modifyMVar m $ \s -> do
let devs = btDevices s
return (s { btDevices = M.delete device devs }, M.lookup device devs)
readDevices :: MutableBtState -> IO ConnectedDevices
readDevices = fmap btDevices . readMVar
devInterface :: InterfaceName
devInterface = interfaceName_ "org.bluez.Device1"
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devConnected :: String
devConnected = "Connected"