Copy Cat

Copy Cat is a ComputerCraft emulator for the web, heavily inspired by the a similar project Mimic. However, unlike Mimic, it's built from the mod's source code - ensuring that it's always ¹ as accurate as possible.

The interface is essentially the same as Cloud Catcher, but with the computer running right in your browser rather than a server!

^1. While we try to keep as close as we can, there are some elements which are impossible to emulate due to the restricted environment of a browser.

For instance, the http API has been entirely recreated, and some functionality (such as setting specific headers or requesting some sites) is not possible. As with any emulator, there will be subtle differences in how input events (key presses, mouse clicks, etc...) are handled, so do not rely on our behaviour.

And yes, this disclaimer was longer than the actual description.

Screenshots

Embedding

It's possible to embed copy-cat within another website. This may be useful if you want to show off your programs on their own site.

<!-- The div to embed your computer. Can be placed anywhere within the page. -->
<div id="embed-computer"></div>

<!-- Any requirejs-compatible loader (https://requirejs.org/) will work. -->
<script type="text/javascript" src="https://copy-cat.squiddev.cc/require.js"></script>

<script>
  // Tell requirejs to load copycat/* from the website.
  require.config({ paths: { copycat: "https://copy-cat.squiddev.cc/" } });
  // Find our #embed-computer element and inject a computer terminal into it.
  require(["copycat/embed"], setup => setup(document.getElementById("embed-computer")));
</script>

The setup function also accepts several arguments, which are demonstrated in this example.

Build it yourself

Due to the nature of this project, Copy Cat has a rather strange build setup. We take sources of Cobalt and CC: Tweaked, modify them to work in a Javascript environment, and then compile them to JS. Thankfully, this is all automated by Gradle. However, it does require a bit of setup:

Before getting started, you will need the JDK (Java Development Kit), and NodeJS installed and on the path.

• Clone Copy Cat with submodules: git clone --recursive https://github.com/SquidDev-CC/copy-cat
• Install NodeJS packages: npm install
• Apply patches: ./gradlew applyPatches
• Build: ./gradlew assemble. You can also automatically build everything when a file changes using ./gradlew assemble --continuous.

The resulting website should be in build/web.

If making further modifications to the files in src/main/java, run ./gradlew makePatches to regenerate the patch directory.

Use git submodule foreach git pull in order to update all source repositories. You will probably need to apply and then regenerate patches after doing so.