Re: [Chicken-users] format-modular usage question

[Kon Lovett]

On Jul 30, 2007, at 10:23 AM, Joshua Griffith wrote:

> Hello,
>
> I'm trying to use format to create a string consisting of the cars  
> of a list of lists delimited by commas and enclosed by  
> parentheses.  I tried the following statement:
> (format #f "(~:{~a~:^, ~})" '((prop1 val1) (prop2 val2) (prop3 val3)))

Umm, according to the "format-modular" doc, '~:^' is not implemented.  
Sorry.

Out of the unimplemented feature set this is probably the next one  
that should be done. Will you open a TRAC ticket please.

Kon

> But it returns:
> "(prop1, prop2, prop3, )"
>
> However, I'm trying to get:
> "(prop1, prop2, prop3)"
>
> It seems that ~:^ is not escaping on the last element, causing the  
> last comma and space to be emitted.  Does anyone know how to modify  
> the format statement to eliminate the last comma and space?  I know  
> that I could just map car and format the result, but I'm trying to  
> learn more about format.
>
> Thanks,
>
> Joshua
>
>
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