Inspect state in fun-mode in Quil using the REPL?

Question

I'm writing a sketch in Clojure/Quil in fun(ctional)-mode.

Sometimes, I want to be able to inspect what the current state holds.

However, when I try to call Quil's state from the REPL I get the following:

(q/state) ==>
NullPointerException   clojure.core/deref-future (core.clj:2208)

Not sure if this is relevant, but the same happens with drawing functions from the REPL:

(q/rect 0 0 10 10)

How can I get the current state to inspect it in the REPL?

Can you post some more code, esp. the function that calls `state` and `deref-future`? — jmargolisvt, Jul 10 '16 at 03:40

score 1 · Answer 1 · answered Jul 12 '16 at 11:11

Not sure which function exactly you are talking about since you do not post code so this is a bit of a blind shot.

You could try to see the state-atom:

(require '[quil.core :as q])

;; both should do the same

@(q/state-atom)
(q/state) ;; is that what you were doing ?

The state function you seem to refer to optionally takes a parameter, for instance, and returns the state-atom when no parameter is passed:

(q/state :image)

In any case, it is generally a good idea to look at the tests of a Clojure library, and the code in this case seems very well documented.

This question concerns the REPL mostly. Sorry I couldn't clarify this much sooner. I'll try the above though. — cwj, Jul 12 '16 at 19:33

score 1 · Answer 2 · answered Sep 02 '19 at 07:12

In order to call Clojure/Quil functions directly in the REPL, they need to be wrapped with the current sketch:

(quil.applet/with-applet hello-quil.core/hello-quil 
  (quil.core/random 10))

To access the state you can do this:

(require '[quil.core :as q])

(quil.applet/with-applet hello-quil.core/hello-quil 
  (q/state))

This is taken directly from the Quil wiki: Dynamic Workflow (for REPL)

2 Answers2