From f78e14611ad9b32a224bdc4058651447ad3a8f32 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 26 Jan 2021 22:30:11 +0100
Subject: Move "sel" to base, and add a callback

---
 guile/starlet/base.scm                      | 21 +++++++++++++++++++++
 guile/starlet/midi-control/button-utils.scm |  2 +-
 guile/starlet/midi-control/faders.scm       | 17 ++++++-----------
 3 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/guile/starlet/base.scm b/guile/starlet/base.scm
index ddefcdf..10bd484 100644
--- a/guile/starlet/base.scm
+++ b/guile/starlet/base.scm
@@ -46,6 +46,8 @@
             find-attr
             fixture?
             fixture-attribute?
+            selection-hook
+            sel
             programmer-state
             current-value))
 
@@ -510,3 +512,22 @@
     ;; Set specified attribute
     ((_ fixture attr-name value)
      (set-attr! (current-state) fixture attr-name value))))
+
+
+(define selection-hook (make-hook 1))
+
+(define selection '())
+
+
+(define (flatten-sublists l)
+  (fold (lambda (a prev)
+          (if (list? a)
+              (append a prev)
+              (cons a prev)))
+        '() l))
+
+
+(define (sel . fixture-list)
+  (set! selection
+    (flatten-sublists fixture-list))
+  (run-hook selection-hook selection))
diff --git a/guile/starlet/midi-control/button-utils.scm b/guile/starlet/midi-control/button-utils.scm
index 008d2c5..f0add16 100644
--- a/guile/starlet/midi-control/button-utils.scm
+++ b/guile/starlet/midi-control/button-utils.scm
@@ -1,6 +1,6 @@
 (define-module (starlet midi-control button-utils)
   #:use-module (starlet midi-control base)
-  #:use-module (starlet midi-control faders)
+  #:use-module (starlet base)
   #:use-module (starlet playback)
   #:export (make-go-button
             make-stop-button
diff --git a/guile/starlet/midi-control/faders.scm b/guile/starlet/midi-control/faders.scm
index cf672f2..113917c 100644
--- a/guile/starlet/midi-control/faders.scm
+++ b/guile/starlet/midi-control/faders.scm
@@ -4,8 +4,7 @@
   #:use-module (ice-9 receive)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-1)
-  #:export (state-on-fader
-            sel))
+  #:export (state-on-fader))
 
 
 (define (put-state-on-fader cc-number
@@ -241,15 +240,8 @@
 ;; Stuff to clear up when we're done with selected fixtures
 (define midi-callbacks '())
 
-(define (flatten-sublists l)
-  (fold (lambda (a prev)
-          (if (list? a)
-              (append a prev)
-              (cons a prev)))
-        '() l))
 
-
-(define (sel . fixture-list)
+(define (select-midi fixture-list)
 
   (define (led-off leds)
     (cond
@@ -268,5 +260,8 @@
 
   (when (car fixture-list)
     (set! midi-callbacks
-      (map (partial midi-control-attr (flatten-sublists fixture-list))
+      (map (partial midi-control-attr fixture-list)
            control-map))))
+
+
+(add-hook! selection-hook select-midi)
-- 
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