Hi Philip,
I don't have an answer to your problem, but I'm curious as to what do you store
in "local.rkt" and "production.rkt" to justify such a complicated solution.
In the projects that I worked on (Racket or otherwise), local vs production
differ in the values for different parameters, which are just key => value
mappings. In Racket, I would just store these as association lists in
"local.rktd" and "production.rktd" than in the code just to a:
(define config-file (if (prodution?) "production.rktd" "local.rktd"))
(define config (call-with-input-file config-file read))
Than just use `assoc` to find the values for the parameters.
Best Regards,
Alex.
On Monday, May 1, 2017 at 9:03:45 AM UTC+8, Philip McGrath wrote:
> I'm working on a #lang for configuration files for a larger project I'm
> working on, and I'm trying to find a setup that meets my (largely cosmetic)
> goals without producing a "standard-module-name-resolver: cycle in loading"
> error.
>
>
> Given the following directory structure:
> my-project/config.rktconfig/local.rktproduction.rkt
> I would like both to write "local.rkt" and "production.rkt" in "#lang
> my-project/config" and to have "(require my-project/config)" provide bindings
> re-exported from "local.rkt" and "production.rkt" and some extra bindings for
> working with those values.
>
>
> This seems like it should be doable, because there aren't any logical cyclic
> dependencies, but I haven't found a way to convince Racket of that.
>
>
> I initially tried making a "my-project/config/lang/" directory with a
> "module-lang.rkt" and a "reader.rkt" consisting of "(module reader
> syntax/module-reader my-project/config/lang/module-language)", then having
> "config.rkt" require and re-export "local.rkt", "production.rkt", and the
> appropriate exports of "module-lang.rkt", but this gave me a "cycle in
> loading" error.
>
>
> My first guess was that the problem might be that Racket was looking for a
> reader submodule of "config.rkt", so I re-wrote "module-lang.rkt" and
> "reader.rkt" as submodules of "config.rkt" (with "module", not "module*" or
> "module+"), but this didn't solve the problem.
>
>
> Is there a way to do what I want?
>
>
> -Philip
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