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

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?

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



> 
> 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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