39 lines
949 B
Standard ML
39 lines
949 B
Standard ML
structure ExceptionLogger =
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struct
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open InputMsg
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val textCommands = ref ""
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fun addCommand inputMsg =
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case inputMsg of
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CHAR_EVENT chr =>
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let
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val chr = CharVector.fromList [chr]
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val newInput = !textCommands ^ chr
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in
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textCommands := newInput
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end
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| _ => ()
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fun log e =
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let
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(* print stack trace for debugging purposes,
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* and then raise another exception to exit the program *)
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val stackTrace = MLton.Exn.history e
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val stackTrace = String.concatWith "\n" stackTrace
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val () = print "ERROR:\n"
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val () = print (stackTrace ^ "\n\n")
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val history = !textCommands ^ "\n\n"
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val () = print ("HISTORY: " ^ history)
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val textOutput = stackTrace ^ "\n" ^ history
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val io = TextIO.openAppend "exceptions.log"
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val () = TextIO.output (io, textOutput)
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val () = TextIO.closeOut io
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in
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raise e
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end
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end
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