From e4270f343a54129ab505edddf92724d310224c9c Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@spork.org>
Date: Mon, 10 Mar 2025 16:08:28 -0400
Subject: fretboard: use Note for normalization

---
 fretboard.mjs | 26 ++++----------------------
 1 file changed, 4 insertions(+), 22 deletions(-)

diff --git a/fretboard.mjs b/fretboard.mjs
index d1d0766..6d92813 100644
--- a/fretboard.mjs
+++ b/fretboard.mjs
@@ -1,4 +1,4 @@
-import { chromaticScale } from "./scale.mjs";
+import { Note } from "./scale.mjs";
 
 // open string notes, starting from the deepest string.
 const strings = {
@@ -10,24 +10,6 @@ const strings = {
     string6: 'E'
 };
 
-// true if not a natural note
-function isAccidental(note) {
-    return note[1] === '♯' || note[1] === '♭';
-}
-
-// convert ‘E♭’ to ‘D♯’ and vice versa.
-function alternateAccidental(note) {
-    const root = chromaticScale.indexOf(note[0]);
-    switch (note[1]) {
-    case '♯':
-        return `${chromaticScale[root+2]}♭`;
-    case '♭':
-        return `${chromaticScale[root-1]}♯`;
-    default:
-        return note;
-    }
-}
-
 // convert ‘fret2’ to Number(2)
 function fretToNote(form, stringName, fretName) {
     const string = strings[stringName];
@@ -47,9 +29,9 @@ function formChanged(form) {
     form.querySelectorAll('tbody .selected').forEach(elt => {
         const string = elt.parentNode.className;
         const val = formData.get(string);
-        const note = fretToNote(form, string, val) || '';
-        if (isAccidental(note)) {
-            elt.innerText = `${note} / ${alternateAccidental(note)}`;
+        const note = Note.fromString(fretToNote(form, string, val));
+        if (note.isSharp) {
+            elt.innerText = `${note} / ${note.toAlternateString()}`;
         } else {
             elt.innerText = note;
         }
-- 
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