54 lines
1.8 KiB
Haskell
54 lines
1.8 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE OverloadedStrings #-}
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module GHCup.Prelude.Windows where
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import Control.Exception.Safe
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import Control.Monad
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#if !MIN_VERSION_base(4,13,0)
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import Control.Monad.Fail ( MonadFail )
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#endif
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import Data.Bits
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import System.Win32.Console
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import System.Win32.File hiding ( copyFile )
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import System.Win32.Types
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-- | Enables ANSI support on windows, does nothing on unix.
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--
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-- Returns 'Left str' on errors and 'Right bool' on success, where
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-- 'bool' markes whether ansi support was already enabled.
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--
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-- This function never crashes.
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--
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-- Rip-off of https://docs.rs/ansi_term/0.12.1/x86_64-pc-windows-msvc/src/ansi_term/windows.rs.html#10-61
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enableAnsiSupport :: IO (Either String Bool)
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enableAnsiSupport = handleIO (pure . Left . displayException) $ do
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-- ref: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew
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-- Using `CreateFileW("CONOUT$", ...)` to retrieve the console handle works correctly even if STDOUT and/or STDERR are redirected
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h <- createFile "CONOUT$" (gENERIC_WRITE .|. gENERIC_READ)
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fILE_SHARE_WRITE Nothing oPEN_EXISTING 0 Nothing
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when (h == iNVALID_HANDLE_VALUE ) $ fail "invalid handle value"
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-- ref: https://docs.microsoft.com/en-us/windows/console/getconsolemode
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m <- getConsoleMode h
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-- VT processing not already enabled?
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if m .&. eNABLE_VIRTUAL_TERMINAL_PROCESSING == 0
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-- https://docs.microsoft.com/en-us/windows/console/setconsolemode
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then setConsoleMode h (m .|. eNABLE_VIRTUAL_TERMINAL_PROCESSING)
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>> pure (Right False)
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else pure (Right True)
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isWindows, isNotWindows :: Bool
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isWindows = True
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isNotWindows = not isWindows
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