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frontend: add html/js logic of pandoc playground
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3 files changed

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‎.github/workflows/build.yml‎

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@@ -35,6 +35,9 @@ jobs:
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~/.ghc-wasm/add_to_github_path.sh
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popd
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- name: checkout
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uses: actions/checkout@v4
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- name: checkout
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uses: actions/checkout@v4
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with:
@@ -57,10 +60,11 @@ jobs:
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wasm32-wasi-cabal build pandoc-cli
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popd
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- name: wasm-opt
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- name: dist
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run: |
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mkdir dist
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wasm-opt --low-memory-unused --converge --gufa --flatten --rereloop -Oz $(find pandoc -type f -name pandoc.wasm) -o dist/pandoc.wasm
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cp frontend/*.html frontend/*.js dist
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- name: test
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run: |

‎frontend/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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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=1.0" />
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<title>pandoc-wasm playground</title>
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<style>
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body {
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display: flex;
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flex-direction: column;
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height: 100vh;
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margin: 0;
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font-family: monospace;
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}
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#container {
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display: flex;
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flex: 1;
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overflow: hidden;
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}
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textarea {
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width: 50%;
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height: 100%;
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border: none;
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padding: 1rem;
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resize: none;
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box-sizing: border-box;
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font-size: 1rem;
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font-family: monospace;
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}
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#input {
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border-right: 1px solid #ccc;
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}
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#output {
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background-color: #f5f5f5;
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color: #333;
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}
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#arguments-container {
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padding: 0.5rem;
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border-top: 1px solid #ccc;
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background-color: #f9f9f9;
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}
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#arguments {
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width: calc(100% - 1rem);
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padding: 0.5rem;
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font-size: 1rem;
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box-sizing: border-box;
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font-family: monospace;
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}
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</style>
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</head>
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<body>
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<div id="container">
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<textarea id="input" placeholder="Enter your input here..."></textarea>
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<textarea
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id="output"
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readonly
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placeholder="Output will be displayed here..."
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></textarea>
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</div>
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<div id="arguments-container">
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<input type="text" id="arguments" value="-f markdown -t rst" />
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</div>
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<script type="module">
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import { run_pandoc } from "./index.js";
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async function updateOutput() {
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const inputText = document.getElementById("input").value;
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const argumentsText = document
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.getElementById("arguments")
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.value.trim()
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.split(" ");
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try {
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const output = await run_pandoc(argumentsText, inputText);
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document.getElementById("output").value = output;
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} catch (err) {
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document.getElementById("output").value = `Error: ${err.message}`;
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}
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}
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document.getElementById("input").addEventListener("input", updateOutput);
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document
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.getElementById("arguments")
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.addEventListener("input", updateOutput);
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</script>
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</body>
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</html>

‎frontend/index.js‎

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import {
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WASI,
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OpenFile,
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File,
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ConsoleStdout,
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} from "https://cdn.jsdelivr.net/npm/@bjorn3/[email protected]/dist/index.js";
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const mod = await WebAssembly.compileStreaming(fetch("./pandoc.wasm"));
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const instance_promise_pool_size = 8;
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const instance_promise_pool = [];
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function instance_promise_pool_fill() {
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if (instance_promise_pool.length < instance_promise_pool_size) {
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for (
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let i = instance_promise_pool.length;
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i < instance_promise_pool_size;
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++i
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) {
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const args = [];
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const env = [];
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const stdin_file = new File(new Uint8Array(), { readonly: true });
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const stdout_file = new File(new Uint8Array(), { readonly: false });
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const fds = [
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new OpenFile(stdin_file),
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new OpenFile(stdout_file),
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ConsoleStdout.lineBuffered((msg) =>
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console.warn(`[WASI stderr] ${msg}`)
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),
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];
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const options = { debug: false };
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const wasi = new WASI(args, env, fds, options);
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instance_promise_pool.push(
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WebAssembly.instantiate(mod, {
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wasi_snapshot_preview1: wasi.wasiImport,
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}).then((instance) => ({ instance, wasi, stdin_file, stdout_file }))
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);
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}
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}
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}
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instance_promise_pool_fill();
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const instances = (async function* () {
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while (true) {
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yield await instance_promise_pool.shift();
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instance_promise_pool_fill();
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}
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})();
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export async function run_pandoc(args, stdin_str) {
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const { instance, wasi, stdin_file, stdout_file } = (await instances.next())
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.value;
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wasi.args = ["pandoc.wasm", ...args];
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stdin_file.data = new TextEncoder().encode(stdin_str);
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const ec = wasi.start(instance);
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if (ec !== 0) {
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throw new Error(`Non-zero exit code ${ec}`);
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}
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return new TextDecoder("utf-8", { fatal: true }).decode(stdout_file.data);
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}

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