diff options
Diffstat (limited to 'src/Plugins')
| -rw-r--r-- | src/Plugins/Monitors.hs | 2 | ||||
| -rw-r--r-- | src/Plugins/Monitors/Volume.hs | 116 |
2 files changed, 115 insertions, 3 deletions
diff --git a/src/Plugins/Monitors.hs b/src/Plugins/Monitors.hs index 873130e..2fe7cc2 100644 --- a/src/Plugins/Monitors.hs +++ b/src/Plugins/Monitors.hs @@ -183,7 +183,7 @@ instance Exec Monitors where start (AutoMPD a) = runMBD a mpdConfig runMPD mpdWait mpdReady #endif #ifdef ALSA - start (Volume m c a r) = runM a volumeConfig (runVolume m c) r + start (Volume m c a r) = startVolume m c a r #endif #ifdef MPRIS start (Mpris1 s a r) = runM a mprisConfig (runMPRIS1 s) r diff --git a/src/Plugins/Monitors/Volume.hs b/src/Plugins/Monitors/Volume.hs index 39697f7..4974e5b 100644 --- a/src/Plugins/Monitors/Volume.hs +++ b/src/Plugins/Monitors/Volume.hs @@ -12,15 +12,30 @@ -- ----------------------------------------------------------------------------- -module Plugins.Monitors.Volume (runVolume, volumeConfig) where +module Plugins.Monitors.Volume + ( startVolume + , runVolume + , volumeConfig + , getMonitorWaiter + , parseOptsIncludingMonitorArgs + , VolumeOpts(refreshMode) + , RefreshMode(..) + ) where +import Commands (tenthSeconds) import Control.Applicative ((<$>)) -import Control.Monad ( liftM2, liftM3, mplus ) +import Control.Concurrent +import Control.Exception +import Control.Monad ( forever, liftM2, liftM3, mplus, void, when, unless ) import Data.Traversable (sequenceA) import Plugins.Monitors.Common import Sound.ALSA.Mixer import qualified Sound.ALSA.Exception as AE import System.Console.GetOpt +import System.Directory +import System.Exit +import System.IO +import System.Process volumeConfig :: IO MConfig volumeConfig = mkMConfig "Vol: <volume>% <status>" @@ -35,8 +50,13 @@ data VolumeOpts = VolumeOpts , highDbThresh :: Float , lowDbThresh :: Float , volumeIconPattern :: Maybe IconPattern + , refreshMode :: RefreshMode } +data RefreshMode = RefreshModePoll + | RefreshModeMonitor (Maybe FilePath) -- alsactl path + deriving(Eq,Show) + defaultOpts :: VolumeOpts defaultOpts = VolumeOpts { onString = "[on] " @@ -46,8 +66,12 @@ defaultOpts = VolumeOpts , highDbThresh = -5.0 , lowDbThresh = -30.0 , volumeIconPattern = Nothing + , refreshMode = RefreshModePoll } +monitorOptionName :: String +monitorOptionName = "monitor" + options :: [OptDescr (VolumeOpts -> VolumeOpts)] options = [ Option "O" ["on"] (ReqArg (\x o -> o { onString = x }) "") "" @@ -58,6 +82,8 @@ options = , Option "c" ["offc"] (ReqArg (\x o -> o { offColor = Just x }) "") "" , Option "" ["volume-icon-pattern"] (ReqArg (\x o -> o { volumeIconPattern = Just $ parseIconPattern x }) "") "" + , Option "" [monitorOptionName] (OptArg (\x o -> + o { refreshMode = RefreshModeMonitor x }) "") "" ] parseOpts :: [String] -> IO VolumeOpts @@ -183,3 +209,89 @@ runVolume mixerName controlName argv = do getFormatSwitch opts (Just sw) = formatSwitch opts sw unavailable = getConfigValue naString + +parseOptsIncludingMonitorArgs :: [String] -> IO VolumeOpts +parseOptsIncludingMonitorArgs args = + -- Drop generic Monitor args first + case getOpt Permute [] args of + (_, args', _) -> parseOpts args' + +startVolume :: String -> String -> [String] -> Int -> (String -> IO ()) -> IO () +startVolume mixerName controlName args rate cb = do + opts <- parseOptsIncludingMonitorArgs args + + waitFunction <- + case refreshMode opts of + RefreshModePoll -> pure $ tenthSeconds rate + RefreshModeMonitor alsaCtlPath -> getMonitorWaiter mixerName alsaCtlPath + + runMB args volumeConfig (runVolume mixerName controlName) waitFunction cb + + +getMonitorWaiter :: String -> Maybe FilePath -> IO (IO ()) +getMonitorWaiter mixerName alsaCtlPath = do + mvar <- newMVar Nothing :: IO (MVar (Maybe SomeException)) + + forkFinally (readerThread mvar) (putMVar mvar . either Just (const Nothing)) + + pure $ do + ei <- takeMVar mvar + case ei of + -- Propagate exceptions from reader thread + Just (SomeException ex) -> throwIO ex + Nothing -> pure () + + where + + readerThread mvar = do + path <- determineAlsaCtlPath + withCreateProcess + (proc "stdbuf" ["-oL", path, "monitor", mixerName]) {std_out = CreatePipe} + run + + where + + defaultPath = "/usr/sbin/alsactl" + + determineAlsaCtlPath = + case alsaCtlPath of + Just path -> do + found <- doesFileExist path + if found + then pure path + else throwIO . ErrorCall $ + "Specified alsactl file " ++ path ++ " does not exist" + + Nothing -> do + (ec, path, err) <- readProcessWithExitCode "which" ["alsactl"] "" + unless (null err) $ hPutStrLn stderr err + case ec of + ExitSuccess -> pure $ trimTrailingNewline path + ExitFailure _ -> do + found <- doesFileExist defaultPath + if found + then pure defaultPath + else throwIO . ErrorCall $ + "alsactl not found in PATH or at " ++ + show defaultPath ++ + "; please specify with --" ++ + monitorOptionName ++ "=/path/to/alsactl" + + + run _ ~(Just out) _ _ = do + hSetBuffering out LineBuffering + forever $ do + c <- hGetChar out + when (c == '\n') $ + -- This uses 'tryPutMVar' because 'putMVar' would make 'runVolume' run + -- once for each event. But we want it to run only once after a burst + -- of events. + void $ tryPutMVar mvar Nothing + +-- This is necessarily very inefficient on 'String's +trimTrailingNewline :: String -> String +trimTrailingNewline x = + case reverse x of + '\n' : '\r' : y -> reverse y + '\n' : y -> reverse y + _ -> x |