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[ base ] Add casts between Int and ExitCode #3432

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Dec 2, 2024
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[ base ] Add casts between Int and ExitCode #3432

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13 changes: 11 additions & 2 deletions libs/base/System.idr
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Original file line number Diff line number Diff line change
Expand Up @@ -294,11 +294,20 @@ data ExitCode : Type where
||| @prf Proof that the int value is non-zero.
ExitFailure : (errNo : Int) -> (So (not $ errNo == 0)) => ExitCode

export
Cast Int ExitCode where
cast 0 = ExitSuccess
cast code = ExitFailure code @{believe_me Oh}

export
Cast ExitCode Int where
cast ExitSuccess = 0
cast (ExitFailure code) = code

||| Exit the program normally, with the specified status.
export
exitWith : HasIO io => ExitCode -> io a
exitWith ExitSuccess = primIO $ believe_me $ prim__exit 0
exitWith (ExitFailure code) = primIO $ believe_me $ prim__exit code
exitWith = primIO . believe_me . prim__exit . cast

||| Exit the program with status value 1, indicating failure.
||| If you want to specify a custom status value, see `exitWith`.
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