Pattern .define + .bootstrap

+ seperate parse / evaluate
+ add Pattern.edit
+ move string hacks to evaluate
+ automate eval scoping with globalThis
+ add random tune button
+ mini: handle angle brackets
+ add chordBass
+ fix old tunes

repl/src/voicings.ts

@@ -1,6 +1,6 @@
-import { Pattern as _Pattern, stack, TimeSpan, Hap, reify } from '../../strudel.mjs';
-import voicings from 'chord-voicings';
-const { dictionaryVoicing, minTopNoteDiff, lefthand } = voicings;
+import { Pattern as _Pattern, stack, Hap, reify } from '../../strudel.mjs';
+import _voicings from 'chord-voicings';
+const { dictionaryVoicing, minTopNoteDiff, lefthand } = _voicings;
 
 const getVoicing = (chord, lastVoicing, range = ['F3', 'A4']) =>
   dictionaryVoicing({
@@ -25,10 +25,29 @@ Pattern.prototype.fmapNested = function (func) {
   );
 };
 
-Pattern.prototype.voicings = function (range = ['F3', 'A4']) {
+Pattern.prototype.voicings = function (range) {
   let lastVoicing;
+  if (!range?.length) {
+    // allows to pass empty array, if too lazy to specify range
+    range = ['F3', 'A4'];
+  }
   return this.fmapNested((event) => {
     lastVoicing = getVoicing(event.value, lastVoicing, range);
     return stack(...lastVoicing);
   });
 };
+
+Pattern.prototype.chordBass = function () { // range = ['G1', 'C3']
+  return this._mapNotes((value) => {
+    console.log('value',value);
+    const [_, root] = value.value.match(/^([a-gC-G])[b#]?.*$/);
+    const bassNote = root + '2';
+    return { ...value, value: bassNote };
+  });
+};
+
+Pattern.prototype.define('voicings', (range, pat) => pat.voicings(range), { composable: true });
+Pattern.prototype.define('chordBass', (pat) => {
+  console.log('call chordBass ...', pat);
+  return pat.chordBass()
+}, { composable: true });