mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-25 04:33:45 +03:00
138 lines
4.1 KiB
Idris
138 lines
4.1 KiB
Idris
module System.Directory
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import System.Errno
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import public System.File
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%default total
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public export
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DirPtr : Type
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DirPtr = AnyPtr
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support : String -> String
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support fn = "C:" ++ fn ++ ", libidris2_support, idris_directory.h"
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%foreign "C:idris2_fileErrno, libidris2_support, idris_file.h"
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"node:support:fileErrno,support_system_file"
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prim__fileErrno : PrimIO Int
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returnError : HasIO io => io (Either FileError a)
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returnError
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= do err <- primIO prim__fileErrno
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pure $ Left $
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case err of
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0 => FileReadError
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1 => FileWriteError
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2 => FileNotFound
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3 => PermissionDenied
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4 => FileExists
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_ => GenericFileError (err-5)
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ok : HasIO io => a -> io (Either FileError a)
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ok x = pure (Right x)
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%foreign support "idris2_currentDirectory"
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"node:lambda:()=>process.cwd()"
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prim__currentDir : PrimIO (Ptr String)
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%foreign support "idris2_changeDir"
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"node:support:changeDir,support_system_directory"
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prim__changeDir : String -> PrimIO Int
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%foreign support "idris2_createDir"
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"node:support:createDir,support_system_directory"
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prim__createDir : String -> PrimIO Int
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%foreign support "idris2_openDir"
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prim__openDir : String -> PrimIO DirPtr
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%foreign support "idris2_closeDir"
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prim__closeDir : DirPtr -> PrimIO ()
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%foreign support "idris2_removeDir"
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prim__removeDir : String -> PrimIO ()
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%foreign support "idris2_nextDirEntry"
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prim__dirEntry : DirPtr -> PrimIO (Ptr String)
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export
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data Directory : Type where
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MkDir : DirPtr -> Directory
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export
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createDir : HasIO io => String -> io (Either FileError ())
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createDir dir
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= do res <- primIO (prim__createDir dir)
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if res == 0
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then ok ()
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else returnError
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export
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changeDir : HasIO io => String -> io Bool
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changeDir dir
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= do ok <- primIO (prim__changeDir dir)
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pure (ok == 0)
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export
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currentDir : HasIO io => io (Maybe String)
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currentDir
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= do res <- primIO prim__currentDir
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if prim__nullPtr res /= 0
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then pure Nothing
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else pure (Just (prim__getString res))
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export
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openDir : HasIO io => String -> io (Either FileError Directory)
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openDir d
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= do res <- primIO (prim__openDir d)
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if prim__nullAnyPtr res /= 0
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then returnError
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else ok (MkDir res)
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export
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closeDir : HasIO io => Directory -> io ()
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closeDir (MkDir d) = primIO (prim__closeDir d)
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export
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removeDir : HasIO io => String -> io ()
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removeDir dirName = primIO (prim__removeDir dirName)
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export
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nextDirEntry : HasIO io => Directory -> io (Either FileError (Maybe String))
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nextDirEntry (MkDir d)
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= do res <- primIO (prim__dirEntry d)
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if prim__nullPtr res /= 0
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then if !(getErrno) /= 0
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then returnError
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else pure $ Right Nothing
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else do let n = prim__getString res
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if n == "." || n == ".."
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then assert_total $ nextDirEntry (MkDir d)
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else pure $ Right (Just n)
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-- This function is deprecated; to be removed after the next version bump
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export
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dirEntry : HasIO io => Directory -> io (Either FileError String)
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dirEntry d = do r <- nextDirEntry d
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pure $ case r of
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Left e => Left e
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Right (Just n) => Right n
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Right Nothing => Left FileNotFound
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collectDir : HasIO io => Directory -> io (Either FileError (List String))
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collectDir d
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= liftIO $ do let (>>=) : (IO . Either e) a -> (a -> (IO . Either e) b) -> (IO . Either e) b
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(>>=) = Prelude.(>>=) @{Monad.Compose {m = IO} {t = Either e}}
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Just n <- nextDirEntry d
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| Nothing => pure $ Right []
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ns <- assert_total $ collectDir d
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pure $ Right (n :: ns)
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export
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listDir : HasIO io => String -> io (Either FileError (List String))
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listDir name = do Right d <- openDir name
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| Left e => pure $ Left e
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ns <- collectDir d
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ignore <- closeDir d
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pure $ ns
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