mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-25 04:33:45 +03:00
58 lines
1.6 KiB
Idris
58 lines
1.6 KiB
Idris
module System.File.Error
|
|
|
|
import System.Errno
|
|
|
|
import System.File.Support
|
|
import public System.File.Types
|
|
|
|
%default total
|
|
|
|
%foreign supportC "idris2_fileError"
|
|
"node:lambda:x=>(x===1?1:0)"
|
|
prim__error : FilePtr -> PrimIO Int
|
|
|
|
%foreign supportC "idris2_fileErrno"
|
|
supportNode "fileErrno"
|
|
prim__fileErrno : PrimIO Int
|
|
|
|
||| The types of errors that can occur during file operations.
|
|
public export
|
|
data FileError = ||| A generic error with an errno
|
|
GenericFileError Int
|
|
| FileReadError
|
|
| FileWriteError
|
|
| FileNotFound
|
|
| PermissionDenied
|
|
| FileExists
|
|
|
|
||| Return the `FileError` corresponding to the errno that was set when the
|
|
||| function call before this one errored.
|
|
export
|
|
returnError : HasIO io => io (Either FileError a)
|
|
returnError
|
|
= do err <- primIO prim__fileErrno
|
|
pure $ Left $
|
|
case err of
|
|
0 => FileReadError
|
|
1 => FileWriteError
|
|
2 => FileNotFound
|
|
3 => PermissionDenied
|
|
4 => FileExists
|
|
_ => GenericFileError (err-5)
|
|
|
|
export
|
|
Show FileError where
|
|
show (GenericFileError errno) = strerror errno
|
|
show FileReadError = "File Read Error"
|
|
show FileWriteError = "File Write Error"
|
|
show FileNotFound = "File Not Found"
|
|
show PermissionDenied = "Permission Denied"
|
|
show FileExists = "File Exists"
|
|
|
|
||| Check if the error indicator for the given file handle is set.
|
|
export
|
|
fileError : HasIO io => File -> io Bool
|
|
fileError (FHandle f)
|
|
= do x <- primIO $ prim__error f
|
|
pure (x /= 0)
|