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58 lines
1.6 KiB
Idris
58 lines
1.6 KiB
Idris
module System.File.Error
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import System.Errno
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import System.File.Support
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import public System.File.Types
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%default total
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%foreign support "idris2_fileError"
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"node:lambda:x=>(x===1?1:0)"
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prim__error : FilePtr -> PrimIO Int
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%foreign support "idris2_fileErrno"
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"node:support:fileErrno,support_system_file"
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prim__fileErrno : PrimIO Int
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||| The types of errors that can occur during file operations.
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public export
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data FileError = ||| A generic error with an errno
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GenericFileError Int
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| FileReadError
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| FileWriteError
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| FileNotFound
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| PermissionDenied
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| FileExists
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||| Return the `FileError` corresponding to the errno that was set when the
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||| function call before this one errored.
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export
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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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export
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Show FileError where
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show (GenericFileError errno) = strerror errno
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show FileReadError = "File Read Error"
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show FileWriteError = "File Write Error"
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show FileNotFound = "File Not Found"
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show PermissionDenied = "Permission Denied"
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show FileExists = "File Exists"
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||| Check if the error indicator for the given file handle is set.
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export
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fileError : HasIO io => File -> io Bool
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fileError (FHandle f)
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= do x <- primIO $ prim__error f
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pure (x /= 0)
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