add basic embed package

packages/embed/README.md

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+# @strudel.cycles/embed
+
+This package contains a embeddable web component for the Strudel REPL.
+
+## Usage
+
+Either install with `npm i @strudel.cycles/embed` or just use a cdn to import the script:
+
+```html
+<script src="https://unpkg.com/@strudel.cycles/embed@latest">
+<strudel-repl>
+  <!--
+  "a4 [a3 c3] a3 c3".color('#F9D649')
+.sub("<7 12 5 12>".slow(2))
+.off(1/4,x=>x.add(7).color("#FFFFFF #0C3AA1 #C63928"))
+.off(1/8,x=>x.add(12).color('#215CB6'))
+.slow(2)
+.legato(sine.range(0.3, 2).slow(28))
+.wave("sawtooth square".fast(2))
+.filter('lowpass', cosine.range(500,4000).slow(16))
+.out()
+.pianoroll({minMidi:20,maxMidi:120,background:'#202124'})
+  -->
+</strudel-repl>
+```
+
+Note that the Code is placed inside HTML comments to prevent the browser from treating it as HTML.

packages/embed/embed.js

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+class Strudel extends HTMLElement {
+  constructor() {
+    super();
+  }
+  connectedCallback() {
+    setTimeout(() => {
+      const code = (this.innerHTML + '').replace('<!--', '').replace('-->', '').trim();
+      const iframe = document.createElement('iframe');
+      const src = `https://strudel.tidalcycles.org/#${encodeURIComponent(btoa(code))}`;
+      iframe.setAttribute('src', src);
+      iframe.setAttribute('width', '600');
+      iframe.setAttribute('height', '400');
+      this.appendChild(iframe);
+    });
+  }
+}
+customElements.define('strudel-repl', Strudel);

packages/embed/example.html

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+<script src="./embed.js"></script>
+
+<strudel-repl>
+  <!--
+  "a4 [a3 c3] a3 c3".color('#F9D649')
+.sub("<7 12 5 12>".slow(2))
+.off(1/4,x=>x.add(7).color("#FFFFFF #0C3AA1 #C63928"))
+.off(1/8,x=>x.add(12).color('#215CB6'))
+.slow(2)
+.legato(sine.range(0.3, 2).slow(28))
+.wave("sawtooth square".fast(2))
+.filter('lowpass', cosine.range(500,4000).slow(16))
+.out()
+.pianoroll({minMidi:20,maxMidi:120,background:'#202124'})
+  -->
+</strudel-repl>

packages/embed/package.json

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+{
+  "name": "@strudel.cycles/embed",
+  "version": "0.0.1",
+  "description": "Embeddable Web Component to load a Strudel REPL into an iframe",
+  "main": "embed.js",
+  "type": "module",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/tidalcycles/strudel.git"
+  },
+  "keywords": [
+    "tidalcycles",
+    "strudel",
+    "pattern",
+    "livecoding",
+    "algorave"
+  ],
+  "author": "Felix Roos <flix91@gmail.com>",
+  "license": "AGPL-3.0-or-later",
+  "bugs": {
+    "url": "https://github.com/tidalcycles/strudel/issues"
+  },
+  "homepage": "https://github.com/tidalcycles/strudel#readme",
+  "dependencies": {}
+}