exporting example code from slideshow documents

[David Bremner]

I mostly use emacs org-mode documents for making (latex beamer) slide
decks. This allows me to "tangle" the example code from the slides,
along with whatever needed supporting material, to generate example
programs that I can share with students. Is there a (pre-built?) way to
do something similar with a #lang slideshow document? I guess in
principle I could embed my slideshow program in an org-mode document,
but I wondered if this could be accomplished with racket, and with less
levels of compiling.

d

[Robby Findler]

I often end up writing macros that both quote some code and expand into that code where the first one is usually via `racket` or one of the code-rendering libraries, and the second one gets used to write tests for the code in my slideshow. These tend to be short and fairly ad hoc macros because I end up customizing them in various ways to support the presentation. I haven't found an idea for a nice general purpose library that does this. In the meantime, there's a bare bones example below. I usually end up starting like that but then doing various fancy things to support the specific examples in good ways.

hth,
Robby

#lang racket
(require slideshow
         slideshow/code
         syntax/parse/define)
(module+ test (require rackunit))

(define-simple-macro
  (code+run e)
  (values (code e) e))

(define-values (x^2+1-pict x^2+1-func)
  (code+run
   (λ (x)
     (+ (* x x)
        1))))
(module+ test
  (check-equal? (x^2+1-func 0) 1)
  (check-equal? (x^2+1-func -1) 2))

(slide x^2+1-pict)

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