From 43e21c32d57067bce99f1263f161ad6f1330730a Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Thu, 31 Dec 2020 17:59:16 +0100
Subject: Manage LEDs for parameter adjustment

---
 guile/starlet/midi-control/faders.scm | 47 +++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 10 deletions(-)

diff --git a/guile/starlet/midi-control/faders.scm b/guile/starlet/midi-control/faders.scm
index 67ece1b..a53262d 100644
--- a/guile/starlet/midi-control/faders.scm
+++ b/guile/starlet/midi-control/faders.scm
@@ -1,6 +1,7 @@
 (define-module (starlet midi-control faders)
   #:use-module (starlet midi-control base)
   #:use-module (starlet base)
+  #:use-module (ice-9 receive)
   #:export (on-fader
             sel))
 
@@ -26,13 +27,17 @@
      state))))
 
 
-(define (at-midi-jogwheel fix attr cc-number)
+(define* (at-midi-jogwheel fix attr cc-number
+                           #:key (led #f))
 
   (define (ccval->offset a)
     (if (eq? a 127)
         -1
         1))
 
+  (when led
+    (send-note-on led))
+
   (let ((old-val (current-value fix attr))
         (offset 0))
     (register-midi-cc-callback!
@@ -46,13 +51,29 @@
 
 
 (define (select-fixtures fixture)
-  (list
-   (at-midi-jogwheel fixture 'intensity 21)
-   (at-midi-jogwheel fixture 'pan 0)
-   (at-midi-jogwheel fixture 'tilt 1)))
-
-
+  (values
+   (list 98 124 125 84 85 86 120 121 122)
+   (list
+    (at-midi-jogwheel fixture 'intensity 21
+                      #:led 98)
+    (at-midi-jogwheel fixture 'pan 0
+                      #:led 124)
+    (at-midi-jogwheel fixture 'tilt 1
+                      #:led 125))))
+;;    (at-midi-fader fixture 'red 4
+;;                      #:led-incongruent 84
+;;                      #:led-congruent 120)
+;;    (at-midi-fader fixture 'green 5
+;;                      #:led-incongruent 85
+;;                      #:led-congruent 121)
+;;    (at-midi-fader fixture 'blue 6
+;;                      #:led-incongruent 86
+;;                      #:led-congruent 122))))
+
+
+;; Stuff to clear up when we're done with selected fixtures
 (define midi-callbacks '())
+(define midi-leds '())
 
 
 (define (sel fixture)
@@ -64,7 +85,13 @@
                          selection-state
                          programmer-state)
     (clear-state! selection-state)
-    (for-each remove-midi-callback! midi-callbacks))
+    (for-each remove-midi-callback! midi-callbacks)
+    (for-each send-note-off midi-leds)
+    (set! midi-callbacks '())
+    (set! midi-leds '()))
+
   (when fixture
-    (set! midi-callbacks
-      (select-fixtures fixture))))
+    (receive (leds callbacks)
+      (select-fixtures fixture)
+      (set! midi-callbacks callbacks)
+      (set! midi-leds leds))))
-- 
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