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authorjao <jao@gnu.org>2018-11-21 23:51:41 +0000
committerjao <jao@gnu.org>2018-11-21 23:51:41 +0000
commit50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d (patch)
treea710ee9a8e9ea9e46951d371af29081e1c72f502 /src/lib/Xmobar/Plugins/StdinReader.hs
parent7674145b878fd315999558075edcfc5e09bdd91c (diff)
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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 Xmobar.Plugins.StdinReader (StdinReader(..)) where
+
+import Prelude
+import System.Posix.Process
+import System.Exit
+import System.IO
+import Control.Exception (SomeException(..), handle)
+import Xmobar.Plugins
+import Xmobar.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 <- isEOF
+ if eof
+ then exitImmediately ExitSuccess
+ else start stdinReader cb
+
+escape :: StdinReader -> String -> String
+escape StdinReader = stripActions
+escape UnsafeStdinReader = id