[racket] Scribble: cgi generated images

I see that you also needed pointers to a few more things; sorry about that.
Here's a working example:

#lang scribble/base

@(require scribble/core
          scribble/html-properties)

@(define cgi-image
   (elem
    #:style
    (make-style #f
                (list (alt-tag "img")
                      (attributes
                       '((src . "
http://strues.org/cgi-bin/tex.cgi?$\\lambda$")))))))

@title{A cgi generated image}

@cgi-image



On Sun, Apr 21, 2013 at 9:34 AM, Robby Findler
<robby at eecs.northwestern.edu>wrote:

> [ adding the list back to the cc line ]
>
> You are right: you cannot. You need to use a different mechanism, the one
> described at the link I sent.
>
> Did you try that and get stuck? If so, it would be great to hear how so I
> can improve those docs to help future users.
>
> Robby
>
>
> On Sun, Apr 21, 2013 at 8:51 AM, Eduardo Costa <edu500ac at gmail.com> wrote:
>
>> I am afraid I will not understand how to make @image{..} accept an url
>> without a concrete example. I tried everything that occurred to me, but it
>> still does not work.  Could you just tell me how to make image accept an
>> url? I think that I will be able to add other things after seeing this
>> example.
>>
>> I used grep to  look for an example in the scribble folder, but I failed
>> in finding one.  Thank you for replying and making suggestions.
>>
>>
>> 2013/4/20 Robby Findler <robby at eecs.northwestern.edu>
>>
>>> You would need to use Scribble's extension mechanism to tell it to
>>> generate an <img> tag (and either don't compile to pdf or do something
>>> clever for that case). Here are the docs for that:
>>>
>>>   http://docs.racket-lang.org/scribble/config.html?q=scribble
>>>
>>> Robby
>>>
>>>
>>> On Sat, Apr 20, 2013 at 6:00 PM, Eduardo Costa <edu500ac at gmail.com>wrote:
>>>
>>>> I need to use scribble to present cgi generated chemical and
>>>> mathematical equations. I mean, the figures will be generated on demand;
>>>> they don't exist when I compile the program. According to the principle of
>>>> least astonishment, I tried something like that:
>>>>
>>>>
>>>> #lang scribble/base
>>>>
>>>> @title{Equations}
>>>>
>>>> @image{http://strues.org/cgi-bin/tex.cgi?\sqrt{2}}
>>>>
>>>>
>>>> When I tried to compile the program, I got an error message:
>>>>
>>>> ~/wrk/scb$ scribble simple.scb
>>>>  [Output to simple.html]
>>>> copy-file: cannot open source file
>>>>   source path: /home/rosa/wrk/scb/http:/strues.org/cgi-bin/tex.cgi
>>>> ?\sqrt{2}
>>>>   destination path: /home/rosa/wrk/scb/tex.cgi?\sqrt{2}
>>>>   system error: No such file or directory; errno=2
>>>>
>>>> It seems that Scribble wants a ready made image on the path offered to
>>>> @image{...}. Is there a way around?
>>>>
>>>>
>>>>
>>>> ____________________
>>>>   Racket Users list:
>>>>   http://lists.racket-lang.org/users
>>>>
>>>>
>>>
>>
>
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