46 lines
1.4 KiB
Haskell
46 lines
1.4 KiB
Haskell
{- Windows paths
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-
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- Copyright 2022-2023 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 OverloadedStrings #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.Path.Windows (
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convertToWindowsNativeNamespace
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) where
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import Utility.Path
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import Utility.OsPath
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import Utility.SystemDirectory
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import qualified Data.ByteString as B
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import qualified System.FilePath.Windows.ByteString as P
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{- Convert a filepath to use Windows's native namespace.
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- This avoids filesystem length limits.
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-
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- This is similar to the way base converts filenames on windows,
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- but as that is implemented in C (create_device_name) and not
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- exported, it cannot be used here. Several edge cases are not handled,
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- including network shares and dos short paths.
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-}
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convertToWindowsNativeNamespace :: RawFilePath -> IO RawFilePath
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convertToWindowsNativeNamespace f
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| win32_dev_namespace `B.isPrefixOf` f = return f
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| win32_file_namespace `B.isPrefixOf` f = return f
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| nt_device_namespace `B.isPrefixOf` f = return f
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| otherwise = do
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-- Make absolute because any '.' and '..' in the path
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-- will not be resolved once it's converted.
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cwd <- getCurrentDirectory
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let p = fromOsPath (simplifyPath (combine cwd (toOsPath f)))
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-- Normalize slashes.
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let p' = P.normalise p
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return (win32_file_namespace <> p')
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where
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win32_dev_namespace = "\\\\.\\"
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win32_file_namespace = "\\\\?\\"
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nt_device_namespace = "\\Device\\"
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