configuring package, wiring everything together

packages/desktopbridge/README.md

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+# @strudel/desktopbridge
+
+This package contains utilities used to communicate with the Tauri backend

packages/desktopbridge/index.mjs

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+/*
+index.mjs - <short description TODO>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/desktopbridge/index.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+export * from './midibridge.mjs';
+export * from './utils.mjs';

packages/desktopbridge/midibridge.mjs

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+import { Invoke } from './utils.mjs';
+import { noteToMidi } from '@strudel.cycles/core';
+
+const ON_MESSAGE = 0x90;
+const OFF_MESSAGE = 0x80;
+
+export function processMidi(output) {
+  return this.onTrigger((time, hap, currentTime) => {
+    console.log('here');
+    const { note, nrpnn, nrpv, ccn, ccv } = hap.value;
+    const offset = (time - currentTime) * 1000;
+    const velocity = Math.floor((hap.context?.velocity ?? 0.9) * 100); // TODO: refactor velocity
+    const duration = Math.floor(hap.duration.valueOf() * 1000 - 10);
+    const roundedOffset = Math.round(offset);
+    const midichan = (hap.value.midichan ?? 1) - 1;
+    const requestedport = output ?? 'IAC';
+    const messagesfromjs = [];
+    if (note != null) {
+      const midiNumber = typeof note === 'number' ? note : noteToMidi(note);
+      messagesfromjs.push({
+        requestedport,
+        message: [ON_MESSAGE + midichan, midiNumber, velocity],
+        offset: roundedOffset,
+      });
+      messagesfromjs.push({
+        requestedport,
+        message: [OFF_MESSAGE + midichan, midiNumber, velocity],
+        offset: roundedOffset + duration,
+      });
+    }
+    if (ccv && ccn) {
+      if (typeof ccv !== 'number' || ccv < 0 || ccv > 1) {
+        throw new Error('expected ccv to be a number between 0 and 1');
+      }
+      if (!['string', 'number'].includes(typeof ccn)) {
+        throw new Error('expected ccn to be a number or a string');
+      }
+      const scaled = Math.round(ccv * 127);
+      messagesfromjs.push({
+        requestedport,
+        message: [ON_MESSAGE + midichan, ccn, scaled],
+        offset: roundedOffset,
+      });
+      messagesfromjs.push({
+        requestedport,
+        message: [OFF_MESSAGE + midichan, ccn, scaled],
+        offset: roundedOffset + duration,
+      });
+    }
+    // invoke is temporarily blocking, run in an async process
+    if (messagesfromjs.length) {
+      setTimeout(() => {
+        Invoke('sendmidi', { messagesfromjs });
+      });
+    }
+  });
+}

packages/desktopbridge/package.json

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+{
+    "name": "@strudel/desktopbridge",
+    "version": "0.1.0",
+    "description": "send midi messages between the JS and Tauri (Rust) sides of the Studel desktop app",
+    "main": "index.mjs",
+    "type": "module",
+    "repository": {
+      "type": "git",
+      "url": "git+https://github.com/tidalcycles/strudel.git"
+    },
+    "keywords": [
+      "tidalcycles",
+      "strudel",
+      "pattern",
+      "livecoding",
+      "algorave"
+    ],
+    "author": "Jade Rowland <jaderowlanddev@gmail.com>",
+    "license": "AGPL-3.0-or-later",
+    "bugs": {
+      "url": "https://github.com/tidalcycles/strudel/issues"
+    },
+    "dependencies": {
+        "@strudel.cycles/core": "workspace:*",
+        "@tauri-apps/api": "^1.4.0"
+      },
+    "homepage": "https://github.com/tidalcycles/strudel#readme"
+  }

packages/desktopbridge/utils.mjs

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+import { invoke } from '@tauri-apps/api/tauri';
+
+export const Invoke = invoke;
+export const isTauri = () => window.__TAURI_IPC__ != null;