[plt-scheme] #lang signature/contract

You can also use

  #lang reader

to make languages from local files.

Robby

On Mon, Nov 30, 2009 at 12:00 PM, Carl Eastlund <carl.eastlund at gmail.com> wrote:
> On Mon, Nov 30, 2009 at 12:51 PM, Synx <plt at synx.us.to> wrote:
>>
>> When I specify "#lang scheme/signature/contract" in my file, according
>> to strace PLT goes looking for the language definition in
>> "$COLLECTS/scheme/signature/contract/lang.ss". But of course $COLLECTS
>> is just the collects directory for my scheme install. I'm not sure if
>> just... sticking the language files there is right. How would you
>> install a language just per-user? Should I use planet for that? I can't
>> imagine one would go #lang (planet synx/something/lang).
>
> You can use #lang with planet, e.g. "#lang planet
> synx/something/lang".  But that's *not* going to look for
> synx/something/lang.ss.  It's going to look for
> synx/something/lang/reader.ss -- that should usually be something
> written in the "syntax/module-reader" language.  See:
>
> http://docs.plt-scheme.org/syntax/reader-helpers.html#(mod-path._syntax/module-reader)
>
> If you want to set up a #lang with planet, see also (planet
> cce/scheme/planet) and use "this-package-version-symbol" to create the
> path to your language's implementation module.  Normal relative module
> paths like "../lang.ss" don't work the "obvious" way with
> syntax/module-reader.
>
> --Carl
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