45 lines
947 B
Haskell
45 lines
947 B
Haskell
{- Determining if output is to a terminal.
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-
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- Copyright 2023 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE CPP, ScopedTypeVariables #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.Terminal (
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IsTerminal(..),
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checkIsTerminal,
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) where
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import System.IO
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#ifdef mingw32_HOST_OS
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import System.Win32.MinTTY (isMinTTYHandle)
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import System.Win32.File
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import System.Win32.Types
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import Graphics.Win32.Misc
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import Control.Exception
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#endif
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newtype IsTerminal = IsTerminal Bool
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checkIsTerminal :: Handle -> IO IsTerminal
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checkIsTerminal h = do
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#ifndef mingw32_HOST_OS
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b <- hIsTerminalDevice h
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return (IsTerminal b)
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#else
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b <- hIsTerminalDevice h
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if b
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then return (IsTerminal b)
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else do
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h' <- getStdHandle sTD_OUTPUT_HANDLE
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`catch` \(_ :: IOError) ->
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return nullHANDLE
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if h' == nullHANDLE
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then return (IsTerminal False)
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else do
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b' <- isMinTTYHandle h'
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return (IsTerminal b)
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#endif
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