Added CommandReader

darcs-hash:20080916052025-c2a52-b56fb3901980591a17383a9267166cc3c9d34185.gz

1 files changed, 31 insertions, 0 deletions

diff --git a/Plugins/CommandReader.hs b/Plugins/CommandReader.hs
new file mode 100644
index 0000000..b084aba
--- /dev/null
+++ b/Plugins/CommandReader.hs
@@ -0,0 +1,31 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.CommandReader
+-- Copyright   :  (c) John Goerzen
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Andrea Rossato <andrea.rossato@unibz.it>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A plugin for reading from external commands
+-- note: stderr is lost here
+--
+-----------------------------------------------------------------------------
+
+module Plugins.CommandReader where
+
+import System.IO
+import Plugins
+
+data CommandReader = CommandReader String String
+    deriving (Read, Show)
+
+instance Exec CommandReader where
+    alias (CommandReader _ a)    = a
+    start (CommandReader p _) cb = do
+        (hstdin, hstdout, hstderr) <- runInteractiveCommand p
+        hClose hstdin
+        hClose hstderr
+        forever (hGetLineSafe hstdout >>= cb)
+        where forever a = a >> forever a