[racket] Problems using Sandbox and Scribble

I guess I might have to try a snapshot, then. The workaround you
provided doesn't seem to actually work. Thanks again for your time.

On Wed, Jan 28, 2015 at 11:02 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> I should have guessed that you'd get that error. It's a bug in v6.1.1
> that has been fixed in the development version.
>
> Is using a development snapshot an option in your case?
>
>   http://www.cs.utah.edu/plt/snapshots/
>
>
> Otherwise, a possible workaround is to add each module with that error
> to `sandbox-namespace-spec`:
>
>    (parameterize ([sandbox-namespace-specs
>                    (append (sandbox-namespace-specs)
>                             '(scribble/manual scribble/racket
>                               racket/stxparam-exptime))])
>          ....)
>
>
> At Wed, 28 Jan 2015 10:56:38 -0700, Lucas Paul wrote:
>> Thanks for that, Matthew. Unfortunately, when I try that, I get a new error:
>>
>> namespace-attach-module: a different instance of the same module is
>> already in the destination namespace
>>   module name: "/usr/share/racket/collects/racket/stxparam-exptime.rkt"
>>
>> On Tue, Jan 27, 2015 at 2:03 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>> > The `#:requires` option of `make-evaluator` requires the named modules
>> > in the sandbox's namespace, but the module instances are distinct from
>> > any instances in the original namespace.
>> >
>> > To attach the original namespace's instances to the sandbox's
>> > namespace, use the `sandbox-namespace-specs` parameter:
>> >
>> >  (define safe-eval
>> >    (parameterize ([sandbox-namespace-specs
>> >                    (append (sandbox-namespace-specs)
>> >                            '(scribble/manual scribble/racket))])
>> >      (make-evaluator 'racket/base
>> >                      #:requires '(scribble/manual scribble/racket))))
>> >
>> > At Tue, 27 Jan 2015 13:22:01 -0700, Lucas Paul wrote:
>> >> Hi.
>> >>
>> >> I want to evaluate some scribble things (in a sandbox) and then
>> >> combine them with other scribble things I already have lying around.
>> >> But I'm running into a problem.
>> >>
>> >> If I, for example, make a nicely formatted (racket) code block in a
>> >> sandbox, and then put it in a (para) outside of that sandbox, the
>> >> world explodes. Here is a minimal example:
>> >>
>> >> #lang racket
>> >>
>> >> (require racket/sandbox
>> >>          scribble/manual)
>> >>
>> >> (define safe-eval
>> >>   (make-evaluator 'racket/base #:requires '(scribble/manual
>> scribble/racket)))
>> >>
>> >> (pretty-print (racket foo))  ; Gives one output
>> >> (pretty-print (safe-eval '(racket foo)))  ; Gives a slightly DIFFERENT
>> output
>> >>
>> >> (para (racket foo))  ; Finishes happily
>> >> (para (safe-eval '(racket foo)))  ; Error
>> >>
>> >> ; end
>> >>
>> >> This is the error I get:
>> >>
>> >> para: contract violation
>> >>   expected: pre-content?
>> >>   given: (cached-element (style "RktSym" (list 'tt-chars (css-addition
>> >> '(collects #"scribble" #"racket.css")) (tex-addition '(collects
>> >> #"scribble" #"racket.tex")))) "foo" (vector (style "RktSym" (list
>> >> 'tt-chars (css-addition '(collects #"scribble" #"racket...
>> >>   in: an element of
>> >>       the rest argument of
>> >>       (->*
>> >>        ()
>> >>        (#:style (or/c style? string? symbol? #f))
>> >>        #:rest
>> >>        (listof pre-content?)
>> >>        paragraph?)
>> >>   contract from:
>> >>       <pkgs>/scribble-lib/scribble/base.rkt
>> >>   blaming: anonymous-module
>> >>    (assuming the contract is correct)
>> >>   at: <pkgs>/scribble-lib/scribble/base.rkt:337.2
>> >>
>> >> What is going on? Why does the same piece of code have two different
>> >> results depending on where it's executing? And most importantly, is
>> >> there a way for me to get this to work the way I /want/?
>> >>
>> >> - Lucas Paul
>> >> ____________________
>> >>   Racket Users list:
>> >>   http://lists.racket-lang.org/users