129 lines
4.0 KiB
Haskell
129 lines
4.0 KiB
Haskell
{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE OverloadedStrings #-}
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--------------------------------------------------------------------------------
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-- | Concurrent module to handle events from acpid
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module XMonad.Internal.Concurrent.ACPIEvent
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( runPowermon
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, runHandleACPI
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) where
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import Control.Exception
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import Control.Monad
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import Data.ByteString hiding (readFile)
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import Data.ByteString.Char8 as C hiding (readFile)
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import Data.Connection
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import Text.Read (readMaybe)
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import System.IO.Streams as S (read)
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import System.IO.Streams.UnixSocket
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import XMonad.Core
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import XMonad.Internal.Command.Power
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import XMonad.Internal.Concurrent.ClientMessage
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import XMonad.Internal.Dependency
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import XMonad.Internal.Shell
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import XMonad.Internal.Theme
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( FontBuilder
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, defFontFamily
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)
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--------------------------------------------------------------------------------
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-- | Data structure to hold the ACPI events I care about
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--
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-- Enumerate so these can be converted to strings and back when sent in a
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-- ClientMessage event to X
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data ACPIEvent = Power
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| Sleep
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| LidClose
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deriving (Eq)
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instance Enum ACPIEvent where
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toEnum 0 = Power
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toEnum 1 = Sleep
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toEnum 2 = LidClose
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toEnum _ = errorWithoutStackTrace "ACPI.Enum.ACPIEvent.toEnum: bad argument"
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fromEnum Power = 0
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fromEnum Sleep = 1
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fromEnum LidClose = 2
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--------------------------------------------------------------------------------
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-- | Internal functions
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-- | Convert a string to an ACPI event (this string is assumed to come from
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-- the acpid socket)
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parseLine :: ByteString -> Maybe ACPIEvent
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parseLine line =
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case splitLine line of
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(_:"PBTN":_) -> Just Power
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(_:"PWRF":_) -> Just Power
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(_:"SLPB":_) -> Just Sleep
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(_:"SBTN":_) -> Just Sleep
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(_:"LID":"close":_) -> Just LidClose
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_ -> Nothing
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where
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splitLine = C.words . C.reverse . C.dropWhile (== '\n') . C.reverse
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-- | Send an ACPIEvent to the X server as a ClientMessage
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sendACPIEvent :: ACPIEvent -> IO ()
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sendACPIEvent = sendXMsg ACPI . show . fromEnum
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isDischarging :: IO (Maybe Bool)
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isDischarging = do
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status <- try $ readFile "/sys/class/power_supply/BAT0/status"
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:: IO (Either IOException String)
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case status of
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Left _ -> return Nothing
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Right s -> return $ Just (s == "Discharging")
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listenACPI :: IO ()
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listenACPI = do
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Connection { source = s } <- connect acpiPath
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forever $ readStream s
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where
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readStream s = do
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out <- S.read s
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mapM_ sendACPIEvent $ parseLine =<< out
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acpiPath :: FilePath
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acpiPath = "/var/run/acpid.socket"
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socketDep :: IOTree_
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socketDep = Only_ $ pathR acpiPath
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-- | Handle ClientMessage event containing and ACPI event (to be used in
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-- Xmonad's event hook)
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handleACPI :: FontBuilder -> X () -> String -> X ()
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handleACPI fb lock tag = do
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let acpiTag = toEnum <$> readMaybe tag :: Maybe ACPIEvent
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forM_ acpiTag $ \case
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Power -> powerPrompt lock fb
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Sleep -> suspendPrompt fb
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LidClose -> do
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status <- io isDischarging
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-- only run suspend if battery exists and is discharging
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forM_ status $ flip when runSuspend
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lock
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--------------------------------------------------------------------------------
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-- | Exported API
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-- | Spawn a new thread that will listen for ACPI events on the acpid socket
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-- and send ClientMessage events when it receives them
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runPowermon :: SometimesIO
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runPowermon = sometimesIO_ "ACPI event monitor" "acpid" socketDep listenACPI
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runHandleACPI :: Always (String -> X ())
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runHandleACPI = Always "ACPI event handler" $ Option sf fallback
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where
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sf = Subfeature withLock "acpid prompt" Error
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withLock = IORoot (uncurry handleACPI)
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$ And12 (,) (fontTreeAlt defFontFamily) $ Only
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$ IOSometimes runScreenLock id
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fallback = Always_ $ FallbackAlone $ const skip
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