NimPlay

NimPlay is a fork of https://github.com/PMunch/nim-playground-frontend/ with Nim VM in WebAssembly.

Structure

• src/frontend.nim - frontend and communication with the worker, compiled to JS via nimble frontend
• src/nimscript.nim - Nim VM, exports runScript function for JS, compiled to WASM and JS via nimble wasm
• public/worker.js - receives code messages from the main thread and returns the result, included in wasm js at compile time

nimble wasm will generate 3 files for you:

nim_version.wasm - actually run Nim VM

nim_version.js - provides js api, configures the file system. Compiled with public/worker.js

nim_version.data - Nim stdlib

nim_version - current Nim version on your machine

NimPlay supports switching Nim versions. To do this, you need to generate this 3 files for each version, and add the version number separated by commas to nim.cfg

Build

1. Install Nim > 1.6.0 with choosenim
2. Install emscripten
3. Run nimble frontend
4. Run nimble wasm
5. Serve public/index.html. For dev you can use emrun public/index.html cmd