You could do it with dynamic-require:
(let ([point-pict (dynamic-require 'plot 'point-pict (λ () #f))])
(when point-pict
(point-pict ...)))
-Philip
On Sat, Feb 17, 2018 at 7:57 PM, Alex Harsanyi <alexharsa...@gmail.com>
wrote:
>
> The recent plot library introduces a new function, `point-pict` which is
> not yet available as part of a Racket distribution, and the plot package
> has to be installed separately from GitHub for this function.
>
> In my code I would like to be able to check if this function is available
> before calling it, so my code compiles correctly even if the function is
> not available. In Emacs Lisp (the only other language I know), I would do:
>
> (when (fbounp 'point-pict)
> (funcall 'point-pict ...)
>
> but I did not find anything equivalent for Racket. Is there a way to to
> get similar functionality in Racket?
>
>
> For reference, the problematic commit is this one:
>
> https://github.com/alex-hhh/ActivityLog2/commit/
> f2f505409b9ee7f30c77090045f1d6bb6ff1b191
>
> And this is how the build fails:
>
> https://travis-ci.org/alex-hhh/ActivityLog2/builds/
> 342890465?utm_source=github_status&utm_medium=notification
>
> Note that, in the running application, the problematic function would
> never be called anyway, since the code checks first if the plot package has
> the new functionality by checking for the presence of the
> `set-mouse-event-callback` method in a plot snip object.
>
> Thanks,
> Alex.
>
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