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(ns main
(:require [missionary.core :as m]
[clojure.set :refer [difference]]))
;; How many times per second are output continuous values sampled and turned
;; into events?
(def sample-rate (atom 1))
;; Temporary atom to explore the concept of note state as a continuous value
(def notes-on (atom #{}))
(def >notes-on (m/signal (m/watch notes-on)))
(defn play-note [v] (swap! notes-on conj v))
(defn stop-note [v] (swap! notes-on disj v))
(def clock
(m/ap
(loop []
(m/amb
(m/?
(m/sleep (/ 1000 @sample-rate)))
:tick
(recur)))))
#_(play-note 1)
#_(stop-note 1)
;; convert the continuous time >notes-on flow to a series of discrete midi note on and off events
(def output
(m/eduction (map (fn [{:keys [note-on note-off]}] {:note-on note-on :note-off note-off}))
(m/reductions (fn [{:keys [active note-on note-off]} [curr _]]
{:note-on (difference (difference curr active) note-on)
:note-off (difference (difference active curr) note-off)
:active curr})
#{}
(m/sample
vector
>notes-on
clock))))
(def cancel
((m/reduce prn output) {} {}))
(cancel)
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