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notebook example inspired by the now abandoned alpha.iodide.io, wasm + rustpython
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‎wasm/notebook/package.json‎

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{
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"name": "app",
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"version": "1.0.0",
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"description": "Bindings to the RustPython library for WebAssembly",
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"main": "index.js",
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"dependencies": {
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"codemirror": "^5.42.0",
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"local-echo": "^0.2.0",
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"xterm": "^3.8.0"
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},
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"devDependencies": {
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"@wasm-tool/wasm-pack-plugin": "^1.1.0",
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"clean-webpack-plugin": "^3.0.0",
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"css-loader": "^3.4.1",
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"html-webpack-plugin": "^3.2.0",
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"mini-css-extract-plugin": "^0.9.0",
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"raw-loader": "^4.0.0",
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"serve": "^11.0.2",
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"webpack": "^4.16.3",
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"webpack-cli": "^3.1.0",
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"webpack-dev-server": "^3.1.5"
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},
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"scripts": {
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"dev": "webpack-dev-server -d",
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"build": "webpack",
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"dist": "webpack --mode production",
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"test": "webpack --mode production && cd ../tests && pipenv run pytest"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/RustPython/RustPython.git"
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},
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"author": "Ryan Liddle",
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"license": "MIT",
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"bugs": {
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"url": "https://github.com/RustPython/RustPython/issues"
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},
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"homepage": "https://github.com/RustPython/RustPython#readme"
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}

‎wasm/notebook/src/index.ejs‎

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link defer async href="https://fonts.googleapis.com/css?family=Fira+Sans|Sen:800&display=swap" rel="stylesheet">
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<title>🐍 RustPython Notebook</title>
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</head>
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<body>
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<!-- navigation bar -->
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<div class="nav-bar">
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<div>
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<button id="run-btn">run notebook &#9658; </button>
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<button id="snippet-btn" class="secondary-btn mr-1">import code</button>
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</div>
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<div class="header">RustPython 🐍 😱 🤘</div>
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<div><a href="https://github.com/RustPython/">github</a></div>
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</div>
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<!-- user interface elements for importing code -->
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<div id="url-container" class="d-none">
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<div><label for="url">public url: (uses github api file url for now)</label></div>
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<div>
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<input type="url" name="url" id="snippet-url">
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</div>
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<div>
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<button id="fetch-code" class="secondary-btn">fetch</button>
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</div>
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</div>
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<!-- code editor and output display -->
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<!-- split view -->
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<div class="split-view full-height">
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<textarea id="code"></textarea>
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<div id="console"></div>
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</div>
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<!-- errors and keyboard shortcuts -->
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<div class="split-view">
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<div>
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<mark>errors</mark>
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<div id="error"></div>
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</div>
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<div class="text-small mt-1">
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<mark>Keyboard Shortcuts:</mark>
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<div>
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<div>Run code: 'Ctrl-Enter' or 'Cmd-Enter'</div>
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<div>Decrease Indent: 'Shift-Tab' </div>
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<div>Toggle comment: 'Ctrl-/' or 'Cmd-/'</div>
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</div>
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</div>
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</div>
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</body>
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</html>

‎wasm/notebook/src/index.js‎

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import './style.css';
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import CodeMirror from 'codemirror';
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import 'codemirror/mode/python/python';
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import 'codemirror/addon/comment/comment';
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import 'codemirror/lib/codemirror.css';
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let rp;
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// UI elements
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const consoleElement = document.getElementById('console');
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const errorElement = document.getElementById('error');
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const fetchbtnElement = document.getElementById("fetch-code");
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const urlConainerElement = document.getElementById('url-container');
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// A dependency graph that contains any wasm must be imported asynchronously.
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import('rustpython')
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.then(rustpy => {
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rp = rustpy;
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// so people can play around with it
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window.rp = rustpy;
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onReady();
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})
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.catch(e => {
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console.error('Error importing `rustpython`:', e);
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document.getElementById('error').textContent = e;
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});
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// Code Mirror code editor
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const editor = CodeMirror.fromTextArea(document.getElementById('code'), {
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extraKeys: {
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'Ctrl-Enter': runCodeFromTextarea,
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'Cmd-Enter': runCodeFromTextarea,
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'Shift-Tab': 'indentLess',
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'Ctrl-/': 'toggleComment',
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'Cmd-/': 'toggleComment',
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Tab: editor => {
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var spaces = Array(editor.getOption('indentUnit') + 1).join(' ');
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editor.replaceSelection(spaces);
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}
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},
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lineNumbers: true,
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mode: 'text/x-python',
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indentUnit: 4,
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autofocus: true
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});
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// Runs the code the the code editor
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function runCodeFromTextarea() {
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// Clean the console and errors
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consoleElement.innerHTML = '';
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errorElement.textContent = '';
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const code = editor.getValue();
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try {
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rp.pyExec(code, {
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stdout: output => {
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consoleElement.innerHTML += output;
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}
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});
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} catch (err) {
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if (err instanceof WebAssembly.RuntimeError) {
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err = window.__RUSTPYTHON_ERROR || err;
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}
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errorElement.textContent = err;
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console.error(err);
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}
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}
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function onReady() {
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// snippets.addEventListener('change', updateSnippet);
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document
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.getElementById('run-btn')
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.addEventListener('click', runCodeFromTextarea);
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// so that the test knows that we're ready
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const readyElement = document.createElement('div');
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readyElement.id = 'rp_loaded';
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document.head.appendChild(readyElement);
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}
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// when clicking the import code button
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// show a UI with a url input + fetch button
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// only accepts api.github.com urls (for now)
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// add another function to parse a regular url
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fetchbtnElement.addEventListener("click", function () {
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// https://developer.github.com/v3/repos/contents/#get-repository-content
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// Format:
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// https://api.github.com/repos/username/reponame/contents/filename.py
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let url = document
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.getElementById('snippet-url')
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.value;
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// minimal js fetch code
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// needs better error handling
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fetch(url)
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.then(res => res.json())
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.then(data => {
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// The Python code is in data.content
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// it is encoded with Base64. Use atob to decode it.
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//https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/atob
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var decodedData = atob(data.content);
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// set the value of the code editor
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editor.setValue(decodedData);
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urlConainerElement.classList.add("d-none");
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}).catch(err => {
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document
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.getElementById("errors")
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.innerHTML = "Couldn't fetch code. Make sure the link is public."
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});
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});
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document.getElementById("snippet-btn").addEventListener("click", function () {
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urlConainerElement.classList.remove("d-none");
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});

‎wasm/notebook/src/style.css‎

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.header {
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font-family: 'Sen', sans-serif;
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;
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}
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.d-flex {
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display: flex;
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}
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.d-none {
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display: none;
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}
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.mr-1 {
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margin-right: 1rem;
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}
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.mt-1 {
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margin-top: 1rem;
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}
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.text-small {
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font-size: 0.75rem;
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}
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mark {
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background-color: #000;
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color: #fff;
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font-size: 0.75rem;
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}
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.nav-bar {
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border-bottom: 2px solid #F74C00;
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display: flex;
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justify-content: space-between;
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position: sticky;
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top: 0px;
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background-color: #fff;
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height: 20px;
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z-index: 99;
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}
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.split-view {
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display: flex;
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justify-content: space-between;
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}
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.split-view div {
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flex-basis: 50%;
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}
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.full-height {
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height: calc(90vh - 60px);
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}
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#console {
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padding: 1rem;
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}
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.CodeMirror {
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height: 90% !important;
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border-right: 1px solid gray;
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}
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#run-btn,
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.secondary-btn {
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border: 0px;
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color: white;
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cursor: pointer;
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}
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#run-btn {
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background-color: #F74C00;
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}
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input[type="url"] {
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border: 1px solid black;
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border-radius: 0px;
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width: 55%;
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margin: 5px 0px 5px 0px;
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font-size: 0.7rem;
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padding: 4px;
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font-family: monospace;
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}
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.url-container {
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padding: 10px;
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background-color: white;
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font-size: smaller;
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}
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.secondary-btn {
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background-color: #000;
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}
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.secondary-btn.active,
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.secondary-btn:hover {
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background-color: #F74C00;
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}
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#error {
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color: tomato;
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margin-top: 10px;
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font-family: monospace;
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white-space: pre;
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}
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#code-wrapper {
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position: relative;
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}

‎wasm/notebook/webpack.config.js‎

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const HtmlWebpackPlugin = require('html-webpack-plugin');
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const MiniCssExtractPlugin = require('mini-css-extract-plugin');
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const WasmPackPlugin = require('@wasm-tool/wasm-pack-plugin');
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const { CleanWebpackPlugin } = require('clean-webpack-plugin');
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const path = require('path');
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const fs = require('fs');
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const interval = setInterval(() => console.log('keepalive'), 1000 * 60 * 5);
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module.exports = (env = {}) => {
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const config = {
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entry: './src/index.js',
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output: {
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path: path.join(__dirname, 'dist'),
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filename: 'index.js'
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},
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mode: 'development',
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resolve: {
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alias: {
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rustpython: path.resolve(
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__dirname,
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env.rustpythonPkg || '../lib/pkg'
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)
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}
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},
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module: {
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rules: [
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{
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test: /\.css$/,
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use: [MiniCssExtractPlugin.loader, 'css-loader']
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}
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]
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},
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plugins: [
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new CleanWebpackPlugin(),
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new HtmlWebpackPlugin({
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filename: 'index.html',
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template: 'src/index.ejs',
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templateParameters: {
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snippets: fs
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.readdirSync(path.join(__dirname, 'snippets'))
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.map(filename =>
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path.basename(filename, path.extname(filename))
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),
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defaultSnippetName: 'fibonacci',
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defaultSnippet: fs.readFileSync(
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path.join(__dirname, 'snippets/fibonacci.py')
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)
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}
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}),
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new MiniCssExtractPlugin({
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filename: 'styles.css'
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}),
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{
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apply(compiler) {
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compiler.hooks.done.tap('clearInterval', () => {
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clearInterval(interval);
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});
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}
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}
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]
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};
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if (!env.noWasmPack) {
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config.plugins.push(
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new WasmPackPlugin({
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crateDirectory: path.join(__dirname, '../lib')
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})
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);
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}
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return config;
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};

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