[plt-scheme] Copying modules between namespaces

--- Robby Findler <robby at cs.uchicago.edu> wrote:
>   For list-related administrative tasks:
>  
> http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> 
> You wrote:
> 
>   (parameterize ([current-namespace eval-space])
>     (namespace-attach-module ... (resolver ...)))
> 
> You need:
> 
>   (define x (resolver ...))
>   (parameterize ([current-namespace eval-space])
>     (namespace-attach-module ... x))
> 

For the benefit of future programmers searching the
archive, it isn't enough to attach the modules, they
then need to be required as well:

(require (lib "xml.ss" "webit")
         (lib "html.ss" "webit"))

(define-syntax with-namespace
  (syntax-rules ()
    ((_ space expr ...)
     (parameterize ((current-namespace space))
       expr ...))))

(define default-space (current-namespace))

(define default-resolver
(current-module-name-resolver))

(define eval-space (make-namespace 'initial))

(define eval-resolver 
  (parameterize ((current-namespace eval-space))
    (current-module-name-resolver)))

(define (initialise-eval-space)
  (define xml (default-resolver  '(lib "xml.ss"
"webit") 'xml #f))
  (define html (default-resolver '(lib "html.ss"
"webit") 'html #f))
  ; Initialise the namespace with the WebIt libraries
  (with-namespace
   eval-space
   (namespace-attach-module
    default-space
    xml)
   
   (namespace-attach-module
    default-space
    html)
   
   (namespace-require '(lib "xml.ss" "webit"))
   (namespace-require '(lib "html.ss" "webit"))))

Noel

=====
Email: noelwelsh <at> yahoo <dot> com
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