strudel cli poc

server/repl.js

@@ -0,0 +1,76 @@
+import repl from 'repl';
+import { evalScope, evaluate } from '@strudel.cycles/eval';
+import { AudioContext } from 'web-audio-api';
+import Speaker from 'speaker';
+import controls from '@strudel.cycles/core/controls.mjs';
+import { prepareSamples, playBuffer } from './sampler.js';
+import { randomHeadline } from './headline.js';
+
+/*
+  This is just a POC of how a strudel cli / repl could look like 
+*/
+
+// setup audio
+const context = new AudioContext();
+context.outStream = new Speaker({
+  channels: context.format.numberOfChannels,
+  bitDepth: context.format.bitDepth,
+  sampleRate: context.sampleRate,
+});
+console.log('now loading samples..');
+const buffers = await prepareSamples(context, './samples/');
+console.log('');
+
+// scheduler
+let tick = 0;
+const slice = 0.5;
+const latency = 1;
+/* console.log('latency', latency);
+console.log('querying every', slice, 's'); */
+const offset = context.currentTime + latency;
+let pattern;
+setInterval(() => {
+  if (pattern) {
+    try {
+      pattern
+        .queryArc(tick * slice, ++tick * slice)
+        .filter((hap) => hap.hasOnset())
+        .forEach((hap) => {
+          const t = hap.whole.begin.valueOf() + offset;
+          const { s, n } = hap.value;
+          const bank = buffers[s];
+          if (bank?.length) {
+            const index = (n ?? 0) % bank.length;
+            playBuffer(context, bank[index], t);
+          }
+        });
+    } catch (err) {
+      console.error('query error', err);
+    }
+  }
+}, slice * 1000);
+
+await evalScope(controls, import('@strudel.cycles/core'), import('@strudel.cycles/mini'));
+console.log(`${randomHeadline()}
+
+welcome to the experimental strudel cli <3
+
+available samples: ${Object.entries(buffers)
+  .map(([key, samples]) => `${key} (${samples.length})`)
+  .join(', ')}   
+you can add samples to the samples folder (.wav, .ogg, .mp3)
+
+please enter a pattern, e.g. s("bd(3,8),~ sd,hh(3,8,1)")
+`);
+// repl
+repl.start({
+  prompt: '>>>',
+  eval: async function myEval(cmd, context, filename, callback) {
+    try {
+      pattern = (await evaluate(cmd)).pattern;
+    } catch (err) {
+      console.error('query error', err.message);
+    }
+    callback(null);
+  },
+});