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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.StdinReader
-- 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 `stdin`.
--
-- Exports:
-- - `StdinReader` to safely display stdin content (striping actions).
-- - `UnsafeStdinReader` to display stdin content as-is.
--
-----------------------------------------------------------------------------
module Plugins.StdinReader (StdinReader(..)) where
import Prelude
import System.Posix.Process
import System.Exit
import System.IO
import Control.Exception (SomeException(..), handle)
import Plugins
import Actions (stripActions)
data StdinReader = StdinReader | UnsafeStdinReader
deriving (Read, Show)
instance Exec StdinReader where
start stdinReader cb = do
s <- handle (\(SomeException e) -> do hPrint stderr e; return "")
(hGetLineSafe stdin)
cb $ escape stdinReader s
eof <- hIsEOF stdin
if eof
then exitImmediately ExitSuccess
else start stdinReader cb
escape :: StdinReader -> String -> String
escape StdinReader = stripActions
escape UnsafeStdinReader = id
|
