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+-----------------------------------------------------------------------------
+-- |
+-- Module : Plugins.CommandReader
+-- Copyright : (c) John Goerzen
+-- License : BSD-style (see LICENSE)
+--
+-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
+-- 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
+import System.Process(runInteractiveCommand, getProcessExitCode)
+
+data CommandReader = CommandReader String String
+ deriving (Read, Show)
+
+instance Exec CommandReader where
+ alias (CommandReader _ a) = a
+ start (CommandReader p _) cb = do
+ (hstdin, hstdout, hstderr, ph) <- runInteractiveCommand p
+ hClose hstdin
+ hClose hstderr
+ hSetBinaryMode hstdout False
+ hSetBuffering hstdout LineBuffering
+ forever ph (hGetLineSafe hstdout >>= cb)
+ where forever ph a =
+ do a
+ ec <- getProcessExitCode ph
+ case ec of
+ Nothing -> forever ph a
+ Just _ -> cb "EXITED"