In my Term.jl project I aim to provide functionality to print nicely formatted, pretty, error messages. A preview: [image] This is inspired by Rich in python that prints error stacks like: [image] In python you can define an exception hook such that all errors go through it and you can print th…

[image] FedeClaudi: what calls show_backtrace and errorshow ? Does it depend on where the code is run (e.g. in VSCode or in the Julia app?). I can re-define show-backtrace and errorshow , but ideally I’d like to intercept error messages before. Yes, it depends on the IDE. In the REPL it’s han…

Thank you, that’s very helpful! Note however that refining any of these functions is type piracy and strongly discouraged Arrrr! I would very much prefer not having to do that! But is there an alternative to it like python’s exception hook? If lines like Base.invokelatest(Base.display_error, e…

[image] FedeClaudi: But is there an alternative to it like python’s exception hook? There is Base.Experimental.register_error_hint, but you seem to already have discovered that. Your projects looks very exciting, so if you have a concrete proposal for what kind of hooks you would need, I thin…

Thanks! I will try starting a discussion with the Julia devs, and perhaps use the hacky fix in the meanwhile. display_error should end up calling showerror , so redefining that should have similar effects. Correct, for now I have re-defined display_error and show_backtrace and seems to get me m…

Perhaps a solution would be to push your own display to the top of the display stack. Literate.jl uses pushdisplay and popdisplay to catch display calls. I believe something similar is done for e.g. the plot pane in the VS code extensions.

Any chance that these pretty stack traces will become the default REPL experience? :heart_eyes:

Thanks @fredrikekre I’ll look into that. @juliohm that seems unlikely (for now at least). But using term is just a couple lines of code to set them up!

@friederikemeier AbstractDisplay is something that I didn’t know about, and it might be very useful in the future, but as far as I can tell I can’t make much use of it here. Thanks anyway!

This is an exciting project to see being worked on! IMO, one of the main disadvantages of Julia in terms of user experience, apart form TTFX , is that error messages are often verbose and intimidating. It is not uncommon to receive three-page nested error messages when (ab)using DataFrames.jl, for …

Intercepting error messages - HOW?

General Usage

FedeClaudi March 4, 2022, 1:30pm 6

@simeonschaub I just wanted to thank you again.
The error formatting is coming along fairly well!

Logging: symbol evaluation under the hood

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Intercepting error messages - HOW?

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