Back to app/src, since it seems they're the default convention for stack

1 files changed, 48 insertions, 0 deletions

diff --git a/src/Xmobar/Plugins/PipeReader.hs b/src/Xmobar/Plugins/PipeReader.hs
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+++ b/src/Xmobar/Plugins/PipeReader.hs
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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 Xmobar.Plugins.PipeReader(PipeReader(..)) where
+
+import System.IO
+import Xmobar.Utils(hGetLineSafe)
+import Xmobar.Run.Commands(Exec(..))
+import Xmobar.System.Environment(expandEnv)
+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