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Diffstat (limited to 'src/Plugins/CommandReader.hs')
-rw-r--r-- | src/Plugins/CommandReader.hs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/Plugins/CommandReader.hs b/src/Plugins/CommandReader.hs new file mode 100644 index 0000000..7c7c92d --- /dev/null +++ b/src/Plugins/CommandReader.hs @@ -0,0 +1,39 @@ +----------------------------------------------------------------------------- +-- | +-- 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" |