52 lines
1.5 KiB
Haskell
52 lines
1.5 KiB
Haskell
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module Xmobar.Plugins.Common
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( chooseColor
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, startListener
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, procSignalMatch
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, na
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, fromSingletonVariant
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, withDBusClientConnection
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, Callback
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)
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where
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import Control.Monad
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import DBus
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import DBus.Client
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import DBus.Internal
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import Data.Maybe
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import XMonad.Hooks.DynamicLog (xmobarColor)
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type Callback = String -> IO ()
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startListener :: IsVariant a => MatchRule -> (Client -> IO [Variant])
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-> ([Variant] -> SignalMatch a) -> (a -> IO String) -> Callback
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-> Client -> IO ()
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startListener rule getProp fromSignal toColor cb client = do
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reply <- getProp client
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procMatch $ maybe Failure Match $ fromVariant =<< listToMaybe reply
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void $ addMatchCallback rule (procMatch . fromSignal) client
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where
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procMatch = procSignalMatch cb toColor
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procSignalMatch :: (String -> IO ()) -> (a -> IO String) -> SignalMatch a -> IO ()
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procSignalMatch callback formatter (Match x) = callback =<< formatter x
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procSignalMatch callback _ Failure = callback na
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procSignalMatch _ _ NoMatch = return ()
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chooseColor :: String -> String -> String -> Bool -> String
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chooseColor text colorOn colorOff state =
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xmobarColor (if state then colorOn else colorOff) "" text
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na :: String
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na = "N/A"
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fromSingletonVariant :: IsVariant a => [Variant] -> Maybe a
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fromSingletonVariant = fromVariant <=< listToMaybe
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withDBusClientConnection :: Bool -> Callback -> (Client -> IO ()) -> IO ()
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withDBusClientConnection sys cb f = maybe (cb na) f =<< getDBusClient sys
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