[Openmcl-devel] Building tables with format

Camille Troillard tuscland at mac.com
Wed Aug 18 09:22:03 UTC 2004


Wow, impressive, this is exactly what I searched for.


			Thank you very much!!!


Camille



On 18 août 04, at 05:56, Hamilton Link wrote:

> Wow, good question! I love format. Mind you I never write a format 
> control string without CLTL2 handy...
>
> After much searching, and deciding there was no straightforward way of 
> doing as you yourself discovered, I revisited the pretty printing 
> chapter of CLTL2. I think ~/.../ may do what you need. Look in section 
> 27.4 of CLTL2, and check this out:
>
> ? (defun chop (s arg &optional colonp atsignp &rest parameters)
>   (print s)
>   (print arg)
>   (print colonp)
>   (print atsignp)
>   (print parameters)
>   (let ((full-result (format nil "~a" arg)))
>     (format s "~a" (subseq full-result 0 (min 10 (length 
> full-result))))))
> CHOP
> ? (format nil "~1,2,3:@/CHOP/" "This string is far, far too long!")
> ;; this was all my debugging output
> #<STRING-OUTPUT-STREAM #x8155244E>
> "This string is far, far too long!"
> T
> T
> (1 2 3)
> ;; this was what was printed by the format command, using CHOP
> "This strin"
> ?
>
> And of course you could make chop take minlength, maxlength, and 
> padchar as parameters and DWYM.
>
> h
>
> On Aug 17, 2004, at 10:06 AM, Camille Troillard wrote:
>
>> Hello,
>>
>> I fear my question is a little bit off topic.
>>
>> I would like to output a table with fixed-width cells.  This means I 
>> need to truncate string arguments in order to keep the cell width 
>> constant.  FORMAT offers a way to add a padding, but there is not way 
>> to truncate a string argument (I would have used an option to the ~A 
>> or ~S directives).
>>
>> Is there any way to extend OpenMCL's FORMAT mechanism in order to do 
>> just that?
>>
>>
>> Thanks for your help,
>> Camille
>>
>> _______________________________________________
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>> Openmcl-devel at clozure.com
>> http://clozure.com/mailman/listinfo/openmcl-devel
>>
>





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