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(ns scratch
(:require [unheard.midi :as midi]
[unheard.midi.percussion :refer [kick snare hat]]
[unheard.clock :refer [clock]]
[unheard.theory :refer [note poly]]
[missionary.core :as m]))
#_(print-all-midi-devices)
(def midi-keyboard "CoreMIDI4J - Minilab3 MIDI")
(defn song
[>c >tonic]
(poly
(poly
;; This is a major cord,
;; held 32 32nd notes.
;; The tonic can vary.
(note >c 0 32 >tonic)
(note >c 0 32 (m/latest #(+ % 4) >tonic))
(note >c 0 32 (m/latest #(+ % 7) >tonic)))
;; The rest of the "song" is a drum pattern.
(note >c 1 1 (m/ap kick))
(note >c 9 1 (m/ap kick))
(note >c 17 1 (m/ap kick))
(note >c 25 1 (m/ap kick))
(note >c 1 1 (m/ap hat))
(note >c 5 1 (m/ap hat))
(note >c 9 1 (m/ap hat))
(note >c 13 1 (m/ap hat))
(note >c 17 1 (m/ap hat))
(note >c 21 1 (m/ap hat))
(note >c 25 1 (m/ap hat))
(note >c 29 1 (m/ap hat))
(note >c 5 1 (m/ap snare))
(note >c 13 1 (m/ap snare))
(note >c 21 1 (m/ap snare))
(note >c 29 1 (m/ap snare))))
(def run
(midi/<bus midi-keyboard
(fn [v]
(m/ap
;; 2 is the number of message types, e.g. :key
(let [[>c c] (clock)
tonic (atom 0)
>tonic (m/signal (m/watch tonic))
p (song >c >tonic)]
(m/amb=
(let [[t f] (m/?> 2 (midi/keyboard v))
[ch k v] (rest (m/?< f))]
(if (= t :control)
(m/amb
(if (and (= ch 0) (= k 74))
(do (reset! c v) (m/amb))
(m/amb))
(if (and (= ch 0) (= k 71))
(do (reset! tonic v) (m/amb))
(m/amb)))
(m/amb)))
[:n (m/?< (m/eduction (dedupe) p))]
[:c (m/?< (m/eduction (dedupe) >c))]))))))
(def cancel
(run prn prn))
(cancel)
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