[plt-scheme] Dr Scheme variable at startup problem

On Tue, 16 Jan 2007, Jay Kint wrote:

> I'm trying to add feature expressions to DrScheme for my own use.  So 
> far, I have the reader macros working, but I can't seem to get the 
> variable *features* to be visible at start up.

Hi Jay,

Would it be possible to do what you want with a "module language" instead?

http://download.plt-scheme.org/doc/360/html/tools/tools-Z-H-2.html#node_sec_2.1.1


For example:

##############################################################
mithril:~/work dyoo$ ls example-lang
info.ss         my-language.ss
mithril:~/work dyoo$ 
mithril:~/work dyoo$ cat example-lang/info.ss
(module info (lib "infotab.ss" "setup")
   (define name "example language")
   (define drscheme-language-modules
     (list "my-language.ss"))
   (define drscheme-language-positions
     (list (list "custom language"
                 "example language"))))

mithril:~/work dyoo$
mithril:~/work dyoo$ cat example-lang/my-language.ss
(module my-language mzscheme
   (provide (all-from mzscheme)
            *features*)


   (define *features* '(dr scheme)))
##############################################################



One way to install this into DrScheme is to do:

#####################################################################
mithril:~/work dyoo$ planet -a test example-lang.plt 1 0 example-lang
mithril:~/work dyoo$ setup-plt -P test example-lang.plt 1 0
#####################################################################

after which the example language should show up under the Languages menu 
in DrScheme.



Best of wishes!