214 lines
6.7 KiB
Haskell
214 lines
6.7 KiB
Haskell
{- path manipulation
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-
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- Copyright 2010-2013 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE PackageImports, CPP #-}
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module Utility.Path where
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import Data.String.Utils
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import System.FilePath
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import System.Directory
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import Data.List
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import Data.Maybe
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import Control.Applicative
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#ifdef __WINDOWS__
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import Data.Char
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import qualified System.FilePath.Posix as Posix
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#else
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import qualified "MissingH" System.Path as MissingH
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#endif
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import Utility.Monad
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import Utility.UserInfo
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{- Makes a path absolute if it's not already.
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- The first parameter is a base directory (ie, the cwd) to use if the path
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- is not already absolute.
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-
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- On Unix, collapses and normalizes ".." etc in the path. May return Nothing
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- if the path cannot be normalized.
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-
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- MissingH's absNormPath does not work on Windows, so on Windows
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- no normalization is done.
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-}
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absNormPath :: FilePath -> FilePath -> Maybe FilePath
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#ifndef __WINDOWS__
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absNormPath dir path = MissingH.absNormPath dir path
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#else
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absNormPath dir path = Just $ combine dir path
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#endif
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{- Returns the parent directory of a path.
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-
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- To allow this to be easily used in loops, which terminate upon reaching the
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- top, the parent of / is "" -}
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parentDir :: FilePath -> FilePath
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parentDir dir
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| null dirs = ""
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| otherwise = joinDrive drive (join s $ init dirs)
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where
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-- on Unix, the drive will be "/" when the dir is absolute, otherwise ""
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(drive, path) = splitDrive dir
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dirs = filter (not . null) $ split s path
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s = [pathSeparator]
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prop_parentDir_basics :: FilePath -> Bool
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prop_parentDir_basics dir
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| null dir = True
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| dir == "/" = parentDir dir == ""
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| otherwise = p /= dir
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where
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p = parentDir dir
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{- Checks if the first FilePath is, or could be said to contain the second.
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- For example, "foo/" contains "foo/bar". Also, "foo", "./foo", "foo/" etc
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- are all equivilant.
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-}
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dirContains :: FilePath -> FilePath -> Bool
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dirContains a b = a == b || a' == b' || (a'++[pathSeparator]) `isPrefixOf` b'
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where
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norm p = fromMaybe "" $ absNormPath p "."
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a' = norm a
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b' = norm b
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{- Converts a filename into a normalized, absolute path.
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-
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- Unlike Directory.canonicalizePath, this does not require the path
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- already exists. -}
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absPath :: FilePath -> IO FilePath
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absPath file = do
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cwd <- getCurrentDirectory
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return $ absPathFrom cwd file
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{- Converts a filename into a normalized, absolute path
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- from the specified cwd. -}
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absPathFrom :: FilePath -> FilePath -> FilePath
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absPathFrom cwd file = fromMaybe bad $ absNormPath cwd file
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where
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bad = error $ "unable to normalize " ++ file
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{- Constructs a relative path from the CWD to a file.
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-
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- For example, assuming CWD is /tmp/foo/bar:
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- relPathCwdToFile "/tmp/foo" == ".."
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- relPathCwdToFile "/tmp/foo/bar" == ""
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-}
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relPathCwdToFile :: FilePath -> IO FilePath
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relPathCwdToFile f = relPathDirToFile <$> getCurrentDirectory <*> absPath f
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{- Constructs a relative path from a directory to a file.
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-
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- Both must be absolute, and normalized (eg with absNormpath).
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-}
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relPathDirToFile :: FilePath -> FilePath -> FilePath
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relPathDirToFile from to = join s $ dotdots ++ uncommon
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where
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s = [pathSeparator]
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pfrom = split s from
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pto = split s to
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common = map fst $ takeWhile same $ zip pfrom pto
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same (c,d) = c == d
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uncommon = drop numcommon pto
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dotdots = replicate (length pfrom - numcommon) ".."
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numcommon = length common
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prop_relPathDirToFile_basics :: FilePath -> FilePath -> Bool
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prop_relPathDirToFile_basics from to
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| from == to = null r
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| otherwise = not (null r)
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where
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r = relPathDirToFile from to
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prop_relPathDirToFile_regressionTest :: Bool
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prop_relPathDirToFile_regressionTest = same_dir_shortcurcuits_at_difference
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where
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{- Two paths have the same directory component at the same
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- location, but it's not really the same directory.
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- Code used to get this wrong. -}
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same_dir_shortcurcuits_at_difference =
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relPathDirToFile (joinPath [pathSeparator : "tmp", "r", "lll", "xxx", "yyy", "18"])
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(joinPath [pathSeparator : "tmp", "r", ".git", "annex", "objects", "18", "gk", "SHA256-foo", "SHA256-foo"])
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== joinPath ["..", "..", "..", "..", ".git", "annex", "objects", "18", "gk", "SHA256-foo", "SHA256-foo"]
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{- Given an original list of paths, and an expanded list derived from it,
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- generates a list of lists, where each sublist corresponds to one of the
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- original paths. When the original path is a directory, any items
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- in the expanded list that are contained in that directory will appear in
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- its segment.
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-}
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segmentPaths :: [FilePath] -> [FilePath] -> [[FilePath]]
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segmentPaths [] new = [new]
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segmentPaths [_] new = [new] -- optimisation
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segmentPaths (l:ls) new = [found] ++ segmentPaths ls rest
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where
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(found, rest)=partition (l `dirContains`) new
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{- This assumes that it's cheaper to call segmentPaths on the result,
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- than it would be to run the action separately with each path. In
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- the case of git file list commands, that assumption tends to hold.
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-}
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runSegmentPaths :: ([FilePath] -> IO [FilePath]) -> [FilePath] -> IO [[FilePath]]
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runSegmentPaths a paths = segmentPaths paths <$> a paths
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{- Converts paths in the home directory to use ~/ -}
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relHome :: FilePath -> IO String
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relHome path = do
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home <- myHomeDir
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return $ if dirContains home path
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then "~/" ++ relPathDirToFile home path
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else path
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{- Checks if a command is available in PATH.
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-
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- The command may be fully-qualified, in which case, this succeeds as
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- long as it exists. -}
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inPath :: String -> IO Bool
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inPath command = isJust <$> searchPath command
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{- Finds a command in PATH and returns the full path to it.
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-
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- The command may be fully qualified already, in which case it will
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- be returned if it exists.
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-}
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searchPath :: String -> IO (Maybe FilePath)
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searchPath command
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| isAbsolute command = check command
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| otherwise = getSearchPath >>= getM indir
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where
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indir d = check $ d </> command
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check f = ifM (doesFileExist f) ( return (Just f), return Nothing )
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{- Checks if a filename is a unix dotfile. All files inside dotdirs
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- count as dotfiles. -}
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dotfile :: FilePath -> Bool
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dotfile file
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| f == "." = False
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| f == ".." = False
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| f == "" = False
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| otherwise = "." `isPrefixOf` f || dotfile (takeDirectory file)
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where
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f = takeFileName file
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{- Converts a DOS style path to a Cygwin style path. Only on Windows.
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- Any trailing '\' is preserved as a trailing '/' -}
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toCygPath :: FilePath -> FilePath
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#ifndef __WINDOWS__
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toCygPath = id
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#else
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toCygPath p
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| null drive = recombine parts
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| otherwise = recombine $ "/cygdrive" : driveletter drive : parts
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where
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(drive, p') = splitDrive p
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parts = splitDirectories p'
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driveletter = map toLower . takeWhile (/= ':')
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recombine = fixtrailing . Posix.joinPath
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fixtrailing s
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| hasTrailingPathSeparator p = Posix.addTrailingPathSeparator s
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| otherwise = s
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#endif
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