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Re: Multiple parallel environments
From: |
Ludovic Courtès |
Subject: |
Re: Multiple parallel environments |
Date: |
Thu, 30 Jul 2009 17:45:58 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux) |
Peter Brett <address@hidden> writes:
> address@hidden (Ludovic Courtès) writes:
[...]
>> Then you are looking for Guile's nifty first-class modules. The module
>> API is unfortunately lightly documented (info "(guile) Module System
>> Reflection").
>
> Indeed. Should I file a feature request for "more useful
> documentation of the Guile module system"?
You can indeed at this to the bug tracker at
http://savannah.gnu.org/bugs/?group=guile, preferably along with a
patch. :-)
[...]
> How much will the way they work be changing in the next stable series
> of Guile releases?
There should not be any user-visible changes (you can already try out
the 1.9 releases to see by yourself).
> How will they work w.r.t. R6RS modules?
It's unclear whether R6RS module support will be part of the forthcoming
2.0 release series; Julian Graham is working on it, though.
>> What you would do is create one module for each file/project/directory:
>>
>> (define (make-per-file-module name)
>> (let ((m (make-module)))
>> (set-module-name! m name) ;; give the module an optional name
>> (beautify-user-module! m) ;; populate the module with the
>> ;; default bindings
>> m))
>
> Something like the following?
>
> SCM
> create_module_for_dir (char *c_path) /* Path is a UTF-8 string */
> {
> SCM magic = scm_from_locale_symbol ("*magic-dir-module*");
> SCM path = scm_from_locale_symbol (c_path);
> SCM module = scm_resolve_module (scm_list_2 (magic, path));
> scm_remember_upto_here_2 (magic, path);
> return module;
> }
>
> Not entirely sure how to emulate "beautify-user-module!" in C... any ideas?
`resolve-module' returns a new empty module (as with `make-module') if
no module of that name exist, so you really need the effect of
`beautify-user-module!'.
The best way is to invoke it:
SCM beautify = scm_c_lookup ("beautify-user-module!");
scm_call_1 (beautify, module);
Thanks,
Ludo'.