294 lines
9.1 KiB
Haskell
294 lines
9.1 KiB
Haskell
{- path manipulation
|
|
-
|
|
- Copyright 2010-2014 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE PackageImports, CPP #-}
|
|
|
|
module Utility.Path where
|
|
|
|
import Data.String.Utils
|
|
import System.FilePath
|
|
import System.Directory
|
|
import Data.List
|
|
import Data.Maybe
|
|
import Data.Char
|
|
import Control.Applicative
|
|
|
|
#ifdef mingw32_HOST_OS
|
|
import qualified System.FilePath.Posix as Posix
|
|
#else
|
|
import System.Posix.Files
|
|
#endif
|
|
|
|
import qualified "MissingH" System.Path as MissingH
|
|
import Utility.Monad
|
|
import Utility.UserInfo
|
|
|
|
{- Simplifies a path, removing any ".." or ".", and removing the trailing
|
|
- path separator.
|
|
-
|
|
- On Windows, preserves whichever style of path separator might be used in
|
|
- the input FilePaths. This is done because some programs in Windows
|
|
- demand a particular path separator -- and which one actually varies!
|
|
-
|
|
- This does not guarantee that two paths that refer to the same location,
|
|
- and are both relative to the same location (or both absolute) will
|
|
- yeild the same result. Run both through normalise from System.FilePath
|
|
- to ensure that.
|
|
-}
|
|
simplifyPath :: FilePath -> FilePath
|
|
simplifyPath path = dropTrailingPathSeparator $
|
|
joinDrive drive $ joinPath $ norm [] $ splitPath path'
|
|
where
|
|
(drive, path') = splitDrive path
|
|
|
|
norm c [] = reverse c
|
|
norm c (p:ps)
|
|
| p' == ".." = norm (drop 1 c) ps
|
|
| p' == "." = norm c ps
|
|
| otherwise = norm (p:c) ps
|
|
where
|
|
p' = dropTrailingPathSeparator p
|
|
|
|
{- Makes a path absolute.
|
|
-
|
|
- The first parameter is a base directory (ie, the cwd) to use if the path
|
|
- is not already absolute.
|
|
-
|
|
- Does not attempt to deal with edge cases or ensure security with
|
|
- untrusted inputs.
|
|
-}
|
|
absPathFrom :: FilePath -> FilePath -> FilePath
|
|
absPathFrom dir path = simplifyPath (combine dir path)
|
|
|
|
{- On Windows, this converts the paths to unix-style, in order to run
|
|
- MissingH's absNormPath on them. Resulting path will use / separators. -}
|
|
absNormPathUnix :: FilePath -> FilePath -> Maybe FilePath
|
|
#ifndef mingw32_HOST_OS
|
|
absNormPathUnix dir path = MissingH.absNormPath dir path
|
|
#else
|
|
absNormPathUnix dir path = todos <$> MissingH.absNormPath (fromdos dir) (fromdos path)
|
|
where
|
|
fromdos = replace "\\" "/"
|
|
todos = replace "/" "\\"
|
|
#endif
|
|
|
|
{- Returns the parent directory of a path.
|
|
-
|
|
- To allow this to be easily used in loops, which terminate upon reaching the
|
|
- top, the parent of / is "" -}
|
|
parentDir :: FilePath -> FilePath
|
|
parentDir dir
|
|
| null dirs = ""
|
|
| otherwise = joinDrive drive (join s $ init dirs)
|
|
where
|
|
-- on Unix, the drive will be "/" when the dir is absolute, otherwise ""
|
|
(drive, path) = splitDrive dir
|
|
dirs = filter (not . null) $ split s path
|
|
s = [pathSeparator]
|
|
|
|
prop_parentDir_basics :: FilePath -> Bool
|
|
prop_parentDir_basics dir
|
|
| null dir = True
|
|
| dir == "/" = parentDir dir == ""
|
|
| otherwise = p /= dir
|
|
where
|
|
p = parentDir dir
|
|
|
|
{- Checks if the first FilePath is, or could be said to contain the second.
|
|
- For example, "foo/" contains "foo/bar". Also, "foo", "./foo", "foo/" etc
|
|
- are all equivilant.
|
|
-}
|
|
dirContains :: FilePath -> FilePath -> Bool
|
|
dirContains a b = a == b || a' == b' || (addTrailingPathSeparator a') `isPrefixOf` b'
|
|
where
|
|
a' = norm a
|
|
b' = norm b
|
|
norm = normalise . simplifyPath
|
|
|
|
{- Converts a filename into an absolute path.
|
|
-
|
|
- Unlike Directory.canonicalizePath, this does not require the path
|
|
- already exists. -}
|
|
absPath :: FilePath -> IO FilePath
|
|
absPath file = do
|
|
cwd <- getCurrentDirectory
|
|
return $ absPathFrom cwd file
|
|
|
|
{- Constructs a relative path from the CWD to a file.
|
|
-
|
|
- For example, assuming CWD is /tmp/foo/bar:
|
|
- relPathCwdToFile "/tmp/foo" == ".."
|
|
- relPathCwdToFile "/tmp/foo/bar" == ""
|
|
-}
|
|
relPathCwdToFile :: FilePath -> IO FilePath
|
|
relPathCwdToFile f = relPathDirToFile <$> getCurrentDirectory <*> absPath f
|
|
|
|
{- Constructs a relative path from a directory to a file.
|
|
-
|
|
- Both must be absolute, and cannot contain .. etc. (eg use absPath first).
|
|
-}
|
|
relPathDirToFile :: FilePath -> FilePath -> FilePath
|
|
relPathDirToFile from to = join s $ dotdots ++ uncommon
|
|
where
|
|
s = [pathSeparator]
|
|
pfrom = split s from
|
|
pto = split s to
|
|
common = map fst $ takeWhile same $ zip pfrom pto
|
|
same (c,d) = c == d
|
|
uncommon = drop numcommon pto
|
|
dotdots = replicate (length pfrom - numcommon) ".."
|
|
numcommon = length common
|
|
|
|
prop_relPathDirToFile_basics :: FilePath -> FilePath -> Bool
|
|
prop_relPathDirToFile_basics from to
|
|
| from == to = null r
|
|
| otherwise = not (null r)
|
|
where
|
|
r = relPathDirToFile from to
|
|
|
|
prop_relPathDirToFile_regressionTest :: Bool
|
|
prop_relPathDirToFile_regressionTest = same_dir_shortcurcuits_at_difference
|
|
where
|
|
{- Two paths have the same directory component at the same
|
|
- location, but it's not really the same directory.
|
|
- Code used to get this wrong. -}
|
|
same_dir_shortcurcuits_at_difference =
|
|
relPathDirToFile (joinPath [pathSeparator : "tmp", "r", "lll", "xxx", "yyy", "18"])
|
|
(joinPath [pathSeparator : "tmp", "r", ".git", "annex", "objects", "18", "gk", "SHA256-foo", "SHA256-foo"])
|
|
== joinPath ["..", "..", "..", "..", ".git", "annex", "objects", "18", "gk", "SHA256-foo", "SHA256-foo"]
|
|
|
|
{- Given an original list of paths, and an expanded list derived from it,
|
|
- generates a list of lists, where each sublist corresponds to one of the
|
|
- original paths. When the original path is a directory, any items
|
|
- in the expanded list that are contained in that directory will appear in
|
|
- its segment.
|
|
-}
|
|
segmentPaths :: [FilePath] -> [FilePath] -> [[FilePath]]
|
|
segmentPaths [] new = [new]
|
|
segmentPaths [_] new = [new] -- optimisation
|
|
segmentPaths (l:ls) new = [found] ++ segmentPaths ls rest
|
|
where
|
|
(found, rest)=partition (l `dirContains`) new
|
|
|
|
{- This assumes that it's cheaper to call segmentPaths on the result,
|
|
- than it would be to run the action separately with each path. In
|
|
- the case of git file list commands, that assumption tends to hold.
|
|
-}
|
|
runSegmentPaths :: ([FilePath] -> IO [FilePath]) -> [FilePath] -> IO [[FilePath]]
|
|
runSegmentPaths a paths = segmentPaths paths <$> a paths
|
|
|
|
{- Converts paths in the home directory to use ~/ -}
|
|
relHome :: FilePath -> IO String
|
|
relHome path = do
|
|
home <- myHomeDir
|
|
return $ if dirContains home path
|
|
then "~/" ++ relPathDirToFile home path
|
|
else path
|
|
|
|
{- Checks if a command is available in PATH.
|
|
-
|
|
- The command may be fully-qualified, in which case, this succeeds as
|
|
- long as it exists. -}
|
|
inPath :: String -> IO Bool
|
|
inPath command = isJust <$> searchPath command
|
|
|
|
{- Finds a command in PATH and returns the full path to it.
|
|
-
|
|
- The command may be fully qualified already, in which case it will
|
|
- be returned if it exists.
|
|
-}
|
|
searchPath :: String -> IO (Maybe FilePath)
|
|
searchPath command
|
|
| isAbsolute command = check command
|
|
| otherwise = getSearchPath >>= getM indir
|
|
where
|
|
indir d = check $ d </> command
|
|
check f = firstM doesFileExist
|
|
#ifdef mingw32_HOST_OS
|
|
[f, f ++ ".exe"]
|
|
#else
|
|
[f]
|
|
#endif
|
|
|
|
{- Checks if a filename is a unix dotfile. All files inside dotdirs
|
|
- count as dotfiles. -}
|
|
dotfile :: FilePath -> Bool
|
|
dotfile file
|
|
| f == "." = False
|
|
| f == ".." = False
|
|
| f == "" = False
|
|
| otherwise = "." `isPrefixOf` f || dotfile (takeDirectory file)
|
|
where
|
|
f = takeFileName file
|
|
|
|
{- Converts a DOS style path to a Cygwin style path. Only on Windows.
|
|
- Any trailing '\' is preserved as a trailing '/' -}
|
|
toCygPath :: FilePath -> FilePath
|
|
#ifndef mingw32_HOST_OS
|
|
toCygPath = id
|
|
#else
|
|
toCygPath p
|
|
| null drive = recombine parts
|
|
| otherwise = recombine $ "/cygdrive" : driveletter drive : parts
|
|
where
|
|
(drive, p') = splitDrive p
|
|
parts = splitDirectories p'
|
|
driveletter = map toLower . takeWhile (/= ':')
|
|
recombine = fixtrailing . Posix.joinPath
|
|
fixtrailing s
|
|
| hasTrailingPathSeparator p = Posix.addTrailingPathSeparator s
|
|
| otherwise = s
|
|
#endif
|
|
|
|
{- Maximum size to use for a file in a specified directory.
|
|
-
|
|
- Many systems have a 255 byte limit to the name of a file,
|
|
- so that's taken as the max if the system has a larger limit, or has no
|
|
- limit.
|
|
-}
|
|
fileNameLengthLimit :: FilePath -> IO Int
|
|
#ifdef mingw32_HOST_OS
|
|
fileNameLengthLimit _ = return 255
|
|
#else
|
|
fileNameLengthLimit dir = do
|
|
l <- fromIntegral <$> getPathVar dir FileNameLimit
|
|
if l <= 0
|
|
then return 255
|
|
else return $ minimum [l, 255]
|
|
where
|
|
#endif
|
|
|
|
{- Given a string that we'd like to use as the basis for FilePath, but that
|
|
- was provided by a third party and is not to be trusted, returns the closest
|
|
- sane FilePath.
|
|
-
|
|
- All spaces and punctuation and other wacky stuff are replaced
|
|
- with '_', except for '.' "../" will thus turn into ".._", which is safe.
|
|
-}
|
|
sanitizeFilePath :: String -> FilePath
|
|
sanitizeFilePath = map sanitize
|
|
where
|
|
sanitize c
|
|
| c == '.' = c
|
|
| isSpace c || isPunctuation c || isSymbol c || isControl c || c == '/' = '_'
|
|
| otherwise = c
|
|
|
|
{- Similar to splitExtensions, but knows that some things in FilePaths
|
|
- after a dot are too long to be extensions. -}
|
|
splitShortExtensions :: FilePath -> (FilePath, [String])
|
|
splitShortExtensions = splitShortExtensions' 5 -- enough for ".jpeg"
|
|
splitShortExtensions' :: Int -> FilePath -> (FilePath, [String])
|
|
splitShortExtensions' maxextension = go []
|
|
where
|
|
go c f
|
|
| len > 0 && len <= maxextension && not (null base) =
|
|
go (ext:c) base
|
|
| otherwise = (f, c)
|
|
where
|
|
(base, ext) = splitExtension f
|
|
len = length ext
|