[racket] Is there a way to specify a reader for the repl for a language?

On Oct 25, 2014, at 12:09 AM, Alexander D. Knauth <alexander at knauth.org> wrote:

> 
> On Oct 24, 2014, at 11:56 PM, Alexander D. Knauth <alexander at knauth.org> wrote:
> 
>> Do you mean something like this?:
>> 
>> (provide (rename-out [-#%module-begin #%module-begin]))
>> 
>> (define-syntax-rule (-#%module-begin form ...)
>>   (#%module-begin
>>    (module configure-runtime racket/base
>>      (current-prompt-read
>>       (let ([old-prompt-read (current-prompt-read)])
>>         (lambda ()
>>           (parameterize ([current-readtable (make-readtable-for-my-lang)])
>>             (old-prompt-read))))))
>>    form ...))
>> 
> 
> I just tried this and it didn’t work.  
> 
> Is there anything else I could need to do to make something like this work?

Ok I tried using current-read-interaction instead of current-prompt-read and that worked.  

> 
> And also would this conflict with other configure-runtime submodules that might be created?  
> 

But what about this?

> 
> 
>> 
>> On Oct 24, 2014, at 11:19 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>> 
>>> I think a `configure-runtime` submodule (in the expansion of any module
>>> using the language) is the right place for this kind of configuration.
>>> 
>>> The `configure-runtime` submodule is similar to `main`, it that it is
>>> only used when the enclosing module is the main module of a program.
>>> 
>>> Instead of a direct `(current-readtable ...)`, I think you'll want a
>>> direct `(current-prompt-read ...)`, where the prompt read handler uses
>>> `(parameterize ([current-readtable ...]) (read-syntax ...))`.
>>> 
>>> At Fri, 24 Oct 2014 22:56:37 -0400, "Alexander D. Knauth" wrote:
>>>> Is there a way to specify a reader for the repl for a language?
>>>> 
>>>> One bad way to do this would be to modify #%module-begin to include
>>>> (current-readtable (make-readtable-for-my-lang))
>>>> or something like that.
>>>> See
>>>> https://github.com/greghendershott/rackjure/pull/46
>>>> https://github.com/greghendershott/rackjure/pull/46#issuecomment-60378324
>>>> 
>>>> One problem with this is that if this module is required from a module without 
>>>> this language, it would affect that module’s current-readtable.  
>>>> 
>>>> So is there a better solution, and if there’s not, would it be possible to add 
>>>> it?
>>>> 
>>>> 
>>>> 
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