74 lines
1.7 KiB
Haskell
74 lines
1.7 KiB
Haskell
{- moving files
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-
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- Copyright 2011-2020 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 #-}
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{-# LANGUAGE LambdaCase #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.MoveFile (
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moveFile,
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) where
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import Control.Monad
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import System.FilePath
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import System.PosixCompat.Files
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import System.IO.Error
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import Prelude
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#ifndef mingw32_HOST_OS
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import Control.Monad.IfElse
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import Utility.SafeCommand
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#endif
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import Utility.SystemDirectory
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import Utility.Tmp
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import Utility.Exception
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import Utility.Monad
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{- Moves one filename to another.
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- First tries a rename, but falls back to moving across devices if needed. -}
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moveFile :: FilePath -> FilePath -> IO ()
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moveFile src dest = tryIO (rename src dest) >>= onrename
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where
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onrename (Right _) = noop
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onrename (Left e)
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| isPermissionError e = rethrow
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| isDoesNotExistError e = rethrow
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| otherwise = viaTmp mv dest ()
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where
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rethrow = throwM e
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mv tmp () = do
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-- copyFile is likely not as optimised as
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-- the mv command, so we'll use the command.
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--
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-- But, while Windows has a "mv", it does not seem very
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-- reliable, so use copyFile there.
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#ifndef mingw32_HOST_OS
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-- If dest is a directory, mv would move the file
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-- into it, which is not desired.
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whenM (isdir dest) rethrow
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ok <- boolSystem "mv" [Param "-f", Param src, Param tmp]
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let e' = e
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#else
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r <- tryIO $ copyFile src tmp
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let (ok, e') = case r of
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Left err -> (False, err)
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Right _ -> (True, e)
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#endif
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unless ok $ do
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-- delete any partial
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_ <- tryIO $ removeFile tmp
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throwM e'
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#ifndef mingw32_HOST_OS
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isdir f = do
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r <- tryIO $ getFileStatus f
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case r of
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(Left _) -> return False
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(Right s) -> return $ isDirectory s
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#endif
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