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------------------------------------------------------------------------------
--- |
--- Module : Xmobar.Commands
--- 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 Commands
- ( Command (..)
- , Exec (..)
- , tenthSeconds
- ) where
-
-import Prelude
-import Control.Concurrent
-import Control.Exception (handle, SomeException(..))
-import Data.Char
-import System.Process
-import System.Exit
-import System.IO (hClose)
-
-import Signal
-import XUtil
-
-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
-
-data Command = Com Program Args Alias Rate
- | ComX Program Args String Alias Rate
- deriving (Show,Read,Eq)
-
-type Args = [String]
-type Program = String
-type Alias = String
-type Rate = Int
-
-instance Exec Command where
- alias (ComX p _ _ a _) =
- if p /= "" then (if a == "" then p else a) else ""
- alias (Com p a al r) = alias (ComX p a "" al r)
- start (Com p as al r) cb =
- start (ComX p as ("Could not execute command " ++ p) al r) cb
- start (ComX prog args msg _ r) cb = if r > 0 then go else exec
- where go = exec >> tenthSeconds r >> go
- exec = do
- (i,o,e,p) <- runInteractiveProcess prog args Nothing Nothing
- exit <- waitForProcess p
- let closeHandles = hClose o >> hClose i >> hClose e
- getL = handle (\(SomeException _) -> return "")
- (hGetLineSafe o)
- case exit of
- ExitSuccess -> do str <- getL
- closeHandles
- cb str
- _ -> closeHandles >> cb msg
-
-
--- | 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