Re: [tw] Silent and Noisy errors

[Jeremy Ruston]

Hi Joe

I’m afraid, as is usual with TiddlyWiki, things are a bit inconsistent for 
historical reasons.

There is explicit error reporting during rendering in a few cases:

* Unknown widget names display the error "Undefined widget ‘widge’
* A recursive transclusion attempt will display the error "Recursive 
transclusion error in transclude widget” (nicely formatted in red)

Most errors beyond that are silent. In retrospect I was far too influenced by 
Markdown back in 2011/12 when TW5 wikitext was first being defined.

> Is this something I can easily fix

Yes, it’d be quite an easy fix for this specific case of flagging invocations 
of missing macros, with the caveat that we’d need to explore the backwards 
compatibility implications of changing the default behaviour; noisy errors 
might need to opt-in.
> I HATE silent errors in programming languages - all programming and run-time 
> errors should cause a
> 
Yes, I think it was a mistake here.

Best wishes

Jeremy

> huge error message and execution should stop immediately. The error message 
> is so the
> 
> programmer can fix the error. Stopping immediately is to avoid further damage.
> 
> 
> 
> I given talks about the evils of silent errors. NaN 
>  in JS for example is causes errors 
> 
> which are terribly difficult to find.
> 
> 
> 
> I think any error that can be detected should result in a noisy error.
> 
> 
> 
> Cheers
> 
> 
> 
> /Joe
> 
> 
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[tw] Silent and Noisy errors

[Joe Armstrong]

I have just discovered a bug in a tiddler.


I misspelled a macro name and didn't notice it – this is actually a common 
error of mine. 

In all programming languages I tend to see what I hoped to see rather than 
what is there. I'm pretty bad at spelling.


Mispellling a macro name is a serious error so I want the system to shout 
out loudly when this happens.


What happens in TW is the expansion of (say) <> causes a 

silent error if baname does not exit. ie there is no replacement text.


I'd like the replacement text to be Missing macro badname -- fatal error in 
tiddler


Is this something I can easily fix


I HATE silent errors in programming languages - all programming and 
run-time errors should cause a 

huge error message and execution should stop immediately. The error message 
is so the

programmer can fix the error. Stopping immediately is to avoid further 
damage.


I given talks about the evils of silent errors. NaN 
 in JS for example is causes errors 

which are terribly difficult to find.


I think any error that can be detected should result in a noisy error.


Cheers


/Joe

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