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|
------------------------------------------------------------------------------
-- |
-- Module: Xmobar.App.TextEventLoop
-- Copyright: (c) 2022 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: unportable
-- Created: Fri Jan 28, 2022 01:21
--
--
-- Text-only event loop
--
------------------------------------------------------------------------------
module Xmobar.App.TextEventLoop (textLoop) where
import Prelude hiding (lookup)
import Control.Monad.Reader
import Control.Concurrent.Async (Async)
import Control.Concurrent.STM
import Xmobar.System.Signal
import Xmobar.Config.Types (Config)
import Xmobar.X11.Parsers (Segment, Widget(..), parseString)
import Xmobar.App.CommandThreads (initLoop, loop)
-- | Starts the main event loop and threads
textLoop :: Config -> IO ()
textLoop conf = loop conf (startTextLoop' conf)
startTextLoop' :: Config
-> TMVar SignalType
-> TMVar ()
-> [[([Async ()], TVar String)]]
-> IO ()
startTextLoop' cfg sig pauser vs = do
tv <- initLoop sig pauser vs
eventLoop cfg tv sig
-- | Continuously wait for a signal from a thread or a interrupt handler
eventLoop :: Config -> TVar [String] -> TMVar SignalType -> IO ()
eventLoop cfg tv signal = do
typ <- atomically $ takeTMVar signal
case typ of
Wakeup -> updateString cfg tv >>= putStrLn >> eventLoop cfg tv signal
_ -> eventLoop cfg tv signal
updateString :: Config -> TVar [String] -> IO String
updateString conf v = do
s <- readTVarIO v
let l:c:r:_ = s ++ repeat ""
liftIO $ concat `fmap` mapM (parseStringAsText conf) [l, c, r]
asText :: Segment -> String
asText (Text s, _, _, _) = s
asText (Hspace n, _, _, _) = replicate (fromIntegral n) ' '
asText _ = ""
parseStringAsText :: Config -> String -> IO String
parseStringAsText c s = do
segments <- parseString c s
let txts = map asText segments
return (concat txts)
|
