359 lines
8.4 KiB
Haskell
359 lines
8.4 KiB
Haskell
{-# OPTIONS_GHC -fglasgow-exts #-}
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module System.FilePath.Find (
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FileInfo(..)
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, FileType(..)
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, FindClause
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, FilterPredicate
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, RecursionPredicate
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, find
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, findWithHandler
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, fold
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, foldWithHandler
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, filePath
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, fileStatus
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, depth
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, fileInfo
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, always
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, extension
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, directory
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, fileName
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, fileType
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, deviceID
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, fileID
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, fileOwner
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, fileGroup
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, fileSize
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, linkCount
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, specialDeviceID
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, fileMode
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, filePerms
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, anyPerms
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, accessTime
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, modificationTime
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, statusChangeTime
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, linkTarget
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, (~~?)
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, (/~?)
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, (==?)
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, (/=?)
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, (>?)
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, (<?)
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, (>=?)
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, (<=?)
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, (&&?)
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, (||?)
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, (.&.?)
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) where
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import Control.Monad (foldM, forM, liftM, liftM2)
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import Control.Monad.Fix (MonadFix)
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import Control.Monad.State (State(..), evalState)
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import Data.Bits (Bits, (.&.))
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import Data.List (sort)
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import System.Directory (getDirectoryContents)
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import System.FilePath ((</>), takeDirectory, takeExtension, takeFileName)
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import System.FilePath.GlobPattern (GlobPattern, (~~), (/~))
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import System.IO (hPutStrLn, stderr)
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import System.IO.Unsafe (unsafeInterleaveIO, unsafePerformIO)
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import qualified Control.Exception as E
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import qualified System.Posix.Files as F
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import qualified System.Posix.Types as T
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data FileInfo = FileInfo
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{
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infoPath :: FilePath
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, infoDepth :: Int
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, infoStatus :: F.FileStatus
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}
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mkFI :: FilePath -> Int -> F.FileStatus -> FileInfo
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mkFI = FileInfo
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newtype FindClause a = FI { runFI :: State FileInfo a }
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deriving (Functor, Monad, MonadFix)
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evalFI :: FindClause a
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-> FilePath
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-> Int
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-> F.FileStatus
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-> a
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evalFI m p d s = evalState (runFI m) (mkFI p d s)
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mkFindClause :: (FileInfo -> (a, FileInfo)) -> FindClause a
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mkFindClause = FI . State
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fileInfo :: FindClause FileInfo
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fileInfo = mkFindClause $ \st -> (st, st)
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filePath :: FindClause FilePath
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filePath = infoPath `liftM` fileInfo
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depth :: FindClause Int
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depth = infoDepth `liftM` fileInfo
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fileStatus :: FindClause F.FileStatus
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fileStatus = infoStatus `liftM` fileInfo
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type FilterPredicate = FindClause Bool
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type RecursionPredicate = FindClause Bool
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getDirContents :: FilePath -> IO [FilePath]
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getDirContents dir = (sort . filter goodName) `liftM` getDirectoryContents dir
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where goodName "." = False
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goodName ".." = False
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goodName _ = True
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findWithHandler :: (FilePath -> E.Exception -> IO [FilePath])
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-> RecursionPredicate
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-> FilterPredicate
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-> FilePath
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-> IO [FilePath]
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findWithHandler errHandler recurse filter path =
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E.handle (errHandler path) $ F.getSymbolicLinkStatus path >>= visit path 0
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where visit path depth st =
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if F.isDirectory st && evalFI recurse path depth st
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then unsafeInterleaveIO (traverse path (succ depth) st)
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else filterPath path depth st []
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traverse dir depth dirSt = do
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names <- E.catch (getDirContents dir) (errHandler dir)
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filteredPaths <- forM names $ \name -> do
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let path = dir </> name
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unsafeInterleaveIO $ E.handle (errHandler path)
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(F.getSymbolicLinkStatus path >>= visit path depth)
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filterPath dir depth dirSt (concat filteredPaths)
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filterPath path depth st result =
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return $ if evalFI filter path depth st
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then path:result
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else result
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find :: RecursionPredicate
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-> FilterPredicate
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-> FilePath
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-> IO [FilePath]
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find = findWithHandler warnOnError
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where warnOnError path err =
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hPutStrLn stderr (path ++ ": " ++ show err) >> return []
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foldWithHandler :: (FilePath -> a -> E.Exception -> IO a)
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-> RecursionPredicate
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-> (a -> FileInfo -> a)
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-> a
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-> FilePath
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-> IO a
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foldWithHandler errHandler recurse f state path =
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E.handle (errHandler path state) $
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F.getSymbolicLinkStatus path >>= visit state path 0
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where visit state path depth st =
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if F.isDirectory st && evalFI recurse path depth st
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then traverse state path (succ depth) st
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else return (f state (mkFI path depth st))
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traverse state dir depth dirSt = E.handle (errHandler dir state) $
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getDirContents dir >>=
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flip foldM (f state (mkFI dir depth dirSt)) (\state name ->
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E.handle (errHandler dir state) $
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let path = dir </> name
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in F.getSymbolicLinkStatus path >>= visit state path depth)
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fold :: RecursionPredicate
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-> (a -> FileInfo -> a)
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-> a
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-> FilePath
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-> IO a
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fold = foldWithHandler warnOnError
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where warnOnError path a err =
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hPutStrLn stderr (path ++ ": " ++ show err) >> return a
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always :: FindClause Bool
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always = return True
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extension :: FindClause FilePath
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extension = takeExtension `liftM` filePath
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fileName :: FindClause FilePath
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fileName = takeFileName `liftM` filePath
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directory :: FindClause FilePath
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directory = takeDirectory `liftM` filePath
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linkTarget :: FindClause (Maybe FilePath)
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linkTarget = do
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path <- filePath
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st <- fileStatus
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return $ if F.isSymbolicLink st
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then unsafePerformIO $ E.handle (const (return Nothing))
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(Just `liftM` F.readSymbolicLink path)
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else Nothing
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data FileType = BlockDevice
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| CharacterDevice
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| NamedPipe
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| RegularFile
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| Directory
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| SymbolicLink
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| Socket
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| Unknown
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deriving (Eq, Ord, Show)
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fileType :: FindClause FileType
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fileType = fType `liftM` fileStatus
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where fType st | F.isBlockDevice st = BlockDevice
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fType st | F.isCharacterDevice st = CharacterDevice
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fType st | F.isNamedPipe st = NamedPipe
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fType st | F.isRegularFile st = RegularFile
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fType st | F.isDirectory st = Directory
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fType st | F.isSymbolicLink st = SymbolicLink
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fType st | F.isSocket st = Socket
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fType _ = Unknown
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deviceID :: FindClause T.DeviceID
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deviceID = F.deviceID `liftM` fileStatus
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fileID :: FindClause T.FileID
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fileID = F.fileID `liftM` fileStatus
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fileOwner :: FindClause T.UserID
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fileOwner = F.fileOwner `liftM` fileStatus
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fileGroup :: FindClause T.GroupID
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fileGroup = F.fileGroup `liftM` fileStatus
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fileSize :: FindClause T.FileOffset
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fileSize = F.fileSize `liftM` fileStatus
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linkCount :: FindClause T.LinkCount
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linkCount = F.linkCount `liftM` fileStatus
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specialDeviceID :: FindClause T.DeviceID
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specialDeviceID = F.specialDeviceID `liftM` fileStatus
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fileMode :: FindClause T.FileMode
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fileMode = F.fileMode `liftM` fileStatus
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filePerms :: FindClause T.FileMode
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filePerms = (.&. 0777) `liftM` fileMode
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anyPerms :: T.FileMode
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-> FindClause Bool
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anyPerms m = filePerms >>= \p -> return (p .&. m /= 0)
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accessTime :: FindClause T.EpochTime
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accessTime = F.accessTime `liftM` fileStatus
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modificationTime :: FindClause T.EpochTime
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modificationTime = F.modificationTime `liftM` fileStatus
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statusChangeTime :: FindClause T.EpochTime
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statusChangeTime = F.statusChangeTime `liftM` fileStatus
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liftOp :: Monad m => (a -> b -> c) -> m a -> b -> m c
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liftOp f a b = a >>= \a' -> return (f a' b)
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(~~?) :: FindClause FilePath
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-> GlobPattern
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-> FindClause Bool
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(~~?) = liftOp (~~)
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infix 4 ~~?
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(/~?) :: FindClause FilePath
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-> GlobPattern
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-> FindClause Bool
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(/~?) = liftOp (/~)
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infix 4 /~?
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(==?) :: Eq a => FindClause a
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-> a
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-> FindClause Bool
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(==?) = liftOp (==)
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infix 4 ==?
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(/=?) :: Eq a => FindClause a
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-> a
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-> FindClause Bool
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(/=?) = liftOp (/=)
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infix 4 /=?
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(>?) :: Ord a => FindClause a
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-> a
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-> FindClause Bool
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(>?) = liftOp (>)
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infix 4 >?
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(<?) :: Ord a => FindClause a
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-> a
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-> FindClause Bool
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(<?) = liftOp (<)
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infix 4 <?
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(.&.?) :: Bits a => FindClause a
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-> a
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-> FindClause a
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(.&.?) = liftOp (.&.)
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infixl 7 .&.?
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(>=?) :: Ord a => FindClause a
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-> a
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-> FindClause Bool
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(>=?) = liftOp (>=)
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infix 4 >=?
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(<=?) :: Ord a => FindClause a
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-> a
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-> FindClause Bool
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(<=?) = liftOp (<=)
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infix 4 <=?
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(&&?) :: FindClause Bool
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-> FindClause Bool
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-> FindClause Bool
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(&&?) = liftM2 (&&)
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infixr 3 &&?
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(||?) :: FindClause Bool
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-> FindClause Bool
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-> FindClause Bool
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(||?) = liftM2 (||)
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infixr 2 ||?
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