From 77df1ac30fa7af5948f7ff64f5fee9aed64552b3 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Sun, 25 Nov 2018 15:10:29 +0000
Subject: Back to app/src, since it seems they're the default convention for
 stack

---
 src/Xmobar/Plugins/PipeReader.hs | 48 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/Xmobar/Plugins/PipeReader.hs

(limited to 'src/Xmobar/Plugins/PipeReader.hs')

diff --git a/src/Xmobar/Plugins/PipeReader.hs b/src/Xmobar/Plugins/PipeReader.hs
new file mode 100644
index 0000000..f18b9cb
--- /dev/null
+++ b/src/Xmobar/Plugins/PipeReader.hs
@@ -0,0 +1,48 @@
+-----------------------------------------------------------------------------
+-- |
+-- 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
-- 
cgit v1.2.3