[Impromptu] Formatting strings (printf-style)

[Scott]

And of course... there is always srfi/48! But I haven't tried this
with impromptu.

http://srfi.schemers.org/srfi-48/srfi-48.html

On Wed, Mar 11, 2009 at 5:13 PM, Andrew Sorensen <andrew at moso.com.au> wrote:
> Yep, no variadic (snazzy name for variable length) methods allowed.
> This generally isn't a problem as there are very few of them and they
> usually have alternatives.  Unfortunately not stringWithFormat ;)  You
> could get around this by writing your own objc method that accepted an
> nsarray (containing your arguments) and then called the
> stringWithFormat method.
>
> Of course in your example you could just as easily write a simple
> utility function:
>
> (define set-precision
>    (lambda (real precision)
>       (let ((prec (expt 10 precision)))
>          (/ (real->integer (* real prec)) prec))))
>
>
> (print (set-precision 3.141592 2))
>
> Cheers,
> Andrew.
>
>
> On 12/03/2009, at 2:18 AM, Glen F wrote:
>
>> Hi there -- a quick question: how to format strings?  I've tried
>> using NSString, but I'm not super-familiar with the ObjC bridge...
>> It doesn't seem to want to work with "stringWithFormat:", which takes
>> a variable number of arguments.  Impromptu returns "too many
>> arguments passed, ignoring additional arguments".
>>
>> What am I doing wrong?
>>
>> ;----------
>> (define nsstring (objc:call "NSString" "stringWithFormat:" "rounded:
>> %.2f" 3.14159))
>> (print nsstring)
>> ;----------
>>
>> This prints out (besides the logged warning about 'too many
>> arguments'):
>>
>> #<OBJC: rounded: 0.00>
>>
>> Thanks,
>> Glen.
>>
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