P0: Rust engine, wire daemon and audio-reactive descent surface

ui/src/lib/format.ts

@@ -0,0 +1,39 @@
+import type { Command } from './types';
+
+const MINUS = '\u2212';
+
+export function fmtDb(level: number): string {
+  if (!(level > 0.0001)) return MINUS + '\u221e';
+  const db = 20 * Math.log10(level);
+  return (db >= 0 ? '+' : MINUS) + Math.abs(db).toFixed(1) + ' dB';
+}
+
+export function fmtTime(bar: number, bpm: number): string {
+  const seconds = Math.max(0, bar - 1) * 4 * (60 / Math.max(40, bpm));
+  const minutes = Math.floor(seconds / 60);
+  const rest = seconds - minutes * 60;
+  return String(minutes).padStart(2, '0') + ':' + rest.toFixed(1).padStart(4, '0');
+}
+
+export function fmtBar(bar: number): string {
+  return (Math.round(bar * 10) / 10).toFixed(1);
+}
+
+export function fmtTempo(bpm: number): string {
+  return Number.isInteger(bpm) ? String(bpm) : bpm.toFixed(1);
+}
+
+export function commandLabel(command: Command): string {
+  switch (command.type) {
+    case 'play': return 'play';
+    case 'stop': return 'stop';
+    case 'strike': return `strike ${command.vein} ${command.velocity.toFixed(2)}`;
+    case 'set_tempo': return `tempo ${fmtTempo(command.bpm)}`;
+    case 'set_vein_gain': return `${command.vein} gain ${command.gain.toFixed(2)}`;
+    case 'get_snapshot': return 'snapshot';
+  }
+}
+
+export function eventLabel(event: { kind: string }): string {
+  return event.kind.replace('_', ' ');
+}