1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
{- directory manipulation
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Utility.Directory where
import System.IO.Error
#if 0
import System.Posix.Files
#endif
import System.Directory
import Control.Exception (throw)
import Control.Monad
import Control.Monad.IfElse
import System.FilePath
import Control.Applicative
import System.IO.Unsafe (unsafeInterleaveIO)
import Utility.SafeCommand
import Utility.TempFile
import Utility.Exception
import Utility.Monad
dirCruft :: FilePath -> Bool
dirCruft "." = True
dirCruft ".." = True
dirCruft _ = False
{- Lists the contents of a directory.
- Unlike getDirectoryContents, paths are not relative to the directory. -}
dirContents :: FilePath -> IO [FilePath]
dirContents d = map (d </>) . filter (not . dirCruft) <$> getDirectoryContents d
{- Gets files in a directory, and then its subdirectories, recursively,
- and lazily. If the directory does not exist, no exception is thrown,
- instead, [] is returned. -}
dirContentsRecursive :: FilePath -> IO [FilePath]
dirContentsRecursive topdir = dirContentsRecursive' [topdir]
dirContentsRecursive' :: [FilePath] -> IO [FilePath]
dirContentsRecursive' [] = return []
dirContentsRecursive' (dir:dirs) = unsafeInterleaveIO $ do
(files, dirs') <- collect [] [] =<< catchDefaultIO [] (dirContents dir)
files' <- dirContentsRecursive' (dirs' ++ dirs)
return (files ++ files')
where
collect files dirs' [] = return (reverse files, reverse dirs')
collect files dirs' (entry:entries)
| dirCruft entry = collect files dirs' entries
| otherwise = do
ifM (doesDirectoryExist entry)
( collect files (entry:dirs') entries
, collect (entry:files) dirs' entries
)
{- Moves one filename to another.
- First tries a rename, but falls back to moving across devices if needed. -}
moveFile :: FilePath -> FilePath -> IO ()
#if 0
moveFile src dest = tryIO (rename src dest) >>= onrename
where
onrename (Right _) = noop
onrename (Left e)
| isPermissionError e = rethrow
| isDoesNotExistError e = rethrow
| otherwise = do
-- copyFile is likely not as optimised as
-- the mv command, so we'll use the latter.
-- But, mv will move into a directory if
-- dest is one, which is not desired.
whenM (isdir dest) rethrow
viaTmp mv dest undefined
where
rethrow = throw e
mv tmp _ = do
ok <- boolSystem "mv" [Param "-f", Param src, Param tmp]
unless ok $ do
-- delete any partial
_ <- tryIO $ removeFile tmp
rethrow
isdir f = do
r <- tryIO $ getFileStatus f
case r of
(Left _) -> return False
(Right s) -> return $ isDirectory s
#else
moveFile = error "moveFile TODO"
#endif
{- Removes a file, which may or may not exist.
-
- Note that an exception is thrown if the file exists but
- cannot be removed. -}
nukeFile :: FilePath -> IO ()
nukeFile file = whenM (doesFileExist file) $ removeFile file
|
