a3b714ddd9
9cb250f7be got the ones in RawFilePath,
but there were others that used the one from unix-compat, which fails at
runtime on windows. To avoid this,
import System.PosixCompat.Files hiding removeLink
This commit was sponsored by Ethan Aubin.
99 lines
3.1 KiB
Haskell
99 lines
3.1 KiB
Haskell
{- directory traversal and manipulation
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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.Directory (
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module Utility.Directory,
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module Utility.SystemDirectory
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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 hiding (removeLink)
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import Control.Applicative
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import System.IO.Unsafe (unsafeInterleaveIO)
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import Data.Maybe
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import Prelude
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import Utility.SystemDirectory
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import Utility.Exception
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import Utility.Monad
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import Utility.Applicative
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dirCruft :: FilePath -> Bool
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dirCruft "." = True
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dirCruft ".." = True
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dirCruft _ = False
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{- Lists the contents of a directory.
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- Unlike getDirectoryContents, paths are not relative to the directory. -}
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dirContents :: FilePath -> IO [FilePath]
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dirContents d = map (d </>) . filter (not . dirCruft) <$> getDirectoryContents d
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{- Gets files in a directory, and then its subdirectories, recursively,
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- and lazily.
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-
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- Does not follow symlinks to other subdirectories.
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-
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- When the directory does not exist, no exception is thrown,
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- instead, [] is returned. -}
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dirContentsRecursive :: FilePath -> IO [FilePath]
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dirContentsRecursive = dirContentsRecursiveSkipping (const False) True
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{- Skips directories whose basenames match the skipdir. -}
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dirContentsRecursiveSkipping :: (FilePath -> Bool) -> Bool -> FilePath -> IO [FilePath]
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dirContentsRecursiveSkipping skipdir followsubdirsymlinks topdir = go [topdir]
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where
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go [] = return []
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go (dir:dirs)
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| skipdir (takeFileName dir) = go dirs
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| otherwise = unsafeInterleaveIO $ do
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(files, dirs') <- collect [] []
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=<< catchDefaultIO [] (dirContents dir)
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files' <- go (dirs' ++ dirs)
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return (files ++ files')
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collect files dirs' [] = return (reverse files, reverse dirs')
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collect files dirs' (entry:entries)
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| dirCruft entry = collect files dirs' entries
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| otherwise = do
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let skip = collect (entry:files) dirs' entries
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let recurse = collect files (entry:dirs') entries
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ms <- catchMaybeIO $ getSymbolicLinkStatus entry
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case ms of
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(Just s)
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| isDirectory s -> recurse
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| isSymbolicLink s && followsubdirsymlinks ->
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ifM (doesDirectoryExist entry)
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( recurse
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, skip
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)
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_ -> skip
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{- Gets the directory tree from a point, recursively and lazily,
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- with leaf directories **first**, skipping any whose basenames
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- match the skipdir. Does not follow symlinks. -}
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dirTreeRecursiveSkipping :: (FilePath -> Bool) -> FilePath -> IO [FilePath]
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dirTreeRecursiveSkipping skipdir topdir = go [] [topdir]
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where
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go c [] = return c
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go c (dir:dirs)
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| skipdir (takeFileName dir) = go c dirs
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| otherwise = unsafeInterleaveIO $ do
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subdirs <- go []
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=<< filterM (isDirectory <$$> getSymbolicLinkStatus)
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=<< catchDefaultIO [] (dirContents dir)
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go (subdirs++dir:c) dirs
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{- Use with an action that removes something, which may or may not exist.
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-
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- If an exception is thrown due to it not existing, it is ignored.
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-}
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removeWhenExistsWith :: (a -> IO ()) -> a -> IO ()
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removeWhenExistsWith f a = void $ tryWhenExists $ f a
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