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------------------------------------------------------------------------------
--- |
--- Module : Plugins.PipeReader
--- Copyright : (c) Andrea Rossato
--- License : BSD-style (see LICENSE)
---
--- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
--- Stability : unstable
--- Portability : unportable
---
--- A plugin for reading from named pipes
---
------------------------------------------------------------------------------
-
-module Plugins.PipeReader where
-
-import System.IO
-import Plugins
-import Environment
-import System.Posix.Files
-import Control.Concurrent(threadDelay)
-import Control.Exception
-import Control.Monad(forever, unless)
-import Control.Applicative ((<$>))
-
-data PipeReader = PipeReader String String
- deriving (Read, Show)
-
-instance Exec PipeReader where
- alias (PipeReader _ a) = a
- start (PipeReader p _) cb = do
- (def, pipe) <- split ':' <$> expandEnv p
- unless (null def) (cb def)
- checkPipe pipe
- h <- openFile pipe ReadWriteMode
- forever (hGetLineSafe h >>= cb)
- where
- split c xs | c `elem` xs = let (pre, post) = span (c /=) xs
- in (pre, dropWhile (c ==) post)
- | otherwise = ([], xs)
-
-checkPipe :: FilePath -> IO ()
-checkPipe file =
- handle (\(SomeException _) -> waitForPipe) $ do
- status <- getFileStatus file
- unless (isNamedPipe status) waitForPipe
- where waitForPipe = threadDelay 1000000 >> checkPipe file