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|
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Exec
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- The 'Exec' class and the 'Command' data type.
--
-- The 'Exec' class rappresents the executable types, whose constructors may
-- appear in the 'Config.commands' field of the 'Config.Config' data type.
--
-- The 'Command' data type is for OS commands to be run by xmobar
--
-----------------------------------------------------------------------------
module Xmobar.Run.Exec (Exec (..), tenthSeconds) where
import Prelude
import Data.Char
import Control.Concurrent
import Xmobar.System.Signal
-- | Work around to the Int max bound: since threadDelay takes an Int, it
-- is not possible to set a thread delay grater than about 45 minutes.
-- With a little recursion we solve the problem.
tenthSeconds :: Int -> IO ()
tenthSeconds s | s >= x = do threadDelay (x * 100000)
tenthSeconds (s - x)
| otherwise = threadDelay (s * 100000)
where x = (maxBound :: Int) `div` 100000
class Show e => Exec e where
alias :: e -> String
alias e = takeWhile (not . isSpace) $ show e
rate :: e -> Int
rate _ = 10
run :: e -> IO String
run _ = return ""
start :: e -> (String -> IO ()) -> IO ()
start e cb = go
where go = run e >>= cb >> tenthSeconds (rate e) >> go
trigger :: e -> (Maybe SignalType -> IO ()) -> IO ()
trigger _ sh = sh Nothing
|
