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|
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.Run
-- Copyright : (C) 2007 Spencer Janssen, Andrea Rossato, glasser@mit.edu
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Christian Thiemann <mail@christian-thiemann.de>
-- Stability : unstable
-- Portability : unportable
--
-- This modules provides several commands to run an external process.
-- It is composed of functions formerly defined in XMonadContrib.Dmenu (by
-- Spenver Jannsen), XMonadContrib.Dzen (by glasser@mit.edu) and
-- XMonadContrib.RunInXTerm (by Andrea Rossato).
--
-----------------------------------------------------------------------------
module XMonadContrib.Run (
-- * Usage
-- $usage
runProcessWithInput,
runProcessWithInputAndWait,
seconds
) where
import XMonad
import Control.Concurrent (threadDelay)
import Control.Monad.State
import System.Environment
import System.Exit
import System.IO
import System.Posix.Process (forkProcess, getProcessStatus, createSession)
import System.Process
-- $usage
-- For an example usage of runInXTerm see XMonadContrib.SshPrompt
--
-- For an example usage of runProcessWithInput see
-- XMonadContrib.{DirectoryPrompt,Dmenu,ShellPrompt,WmiiActions,WorkspaceDir}
--
-- For an example usage of runProcessWithInputAndWait see XMonadContrib.Dzen
-- | Returns Just output if the command succeeded, and Nothing if it didn't.
-- This corresponds to dmenu's notion of exit code 1 for a cancelled invocation.
runProcessWithInput :: FilePath -> [String] -> String -> IO String
runProcessWithInput cmd args input = do
(pin, pout, perr, ph) <- runInteractiveProcess cmd args Nothing Nothing
hPutStr pin input
hClose pin
output <- hGetContents pout
when (output==output) $ return ()
hClose pout
hClose perr
waitForProcess ph
return output
-- wait is in us
runProcessWithInputAndWait :: FilePath -> [String] -> String -> Int -> IO ()
runProcessWithInputAndWait cmd args input timeout = do
pid <- forkProcess $ do
forkProcess $ do -- double fork it over to init
createSession
(pin, pout, perr, ph) <- runInteractiveProcess cmd args Nothing Nothing
hPutStr pin input
hFlush pin
threadDelay timeout
hClose pin
-- output <- hGetContents pout
-- when (output==output) $ return ()
hClose pout
hClose perr
waitForProcess ph
return ()
exitWith ExitSuccess
return ()
getProcessStatus True False pid
return ()
{- | Multiplies by ONE MILLION, for use with runProcessWithInputAndWait.
Use like:
> (5.5 `seconds`)
-}
seconds :: Rational -> Int
seconds = fromEnum . (* 1000000)
|
