Browser JavaScript Support

[michaeljmcd]

This change makes it possible to call GNOLL from a web page with the use of some glue code. This is something of a rough pass, so any feedback is appreciated.

Description

• Adds a separate target for building the browser based JavaScript version.
• Some wrapper code is needed to capture the printf() output.

How Has This Been Tested

• Build with make all jsweb
• Start a web server (e.g. python3 -m http.server 8003 &> /dev/null &)
• Load index.html (http://localhost:8003/index.html in the previous example).
• Provide notation in the textbox and press the "Roll" button. Output is printed to a separate div.

Change Type

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Test Coverage (Additional test(s) without any extra code)
• [ ] Documentation Improvements
• [ ] Code Quality / Maintenance

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation & I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] I give my permission for my code to be used in this project under this license and any future license terms

[ianfhunter]

Thanks! I'm looking forward to trying this out

[michaeljmcd]

Experimenting further, I was able to get the bundle down to a single file (embedded WASM) and wrote a wrapper similar to the Python one.

Code is in: https://github.com/michaeljmcd/GNOLL/tree/javascript-bundle

If this looks like a good direction, I can merge these changes into the PR.

The one feature I couldn't readily port was showing a dice breakdown because the browser version doesn't use the temporary file and the breakdown isn't written to stdout.

[ianfhunter]

Just had a go at setting it up - looks great! Very easy to play around with. :) 🚀

The bundled version looks good - the index.html code is very concise if someone wanted to integrate it. If you want to update this PR we can include it

I'll make a ticket for myself to look at allowing dice breakdown to go to stdout in the future + I'll see if I can get some sort of selenium test so any other contributions can be automatically verified.

[michaeljmcd]

Excellent. I went ahead and merged javascript-bundle into javascript-web.

[ianfhunter]

Fantastic! Thanks for contributing, this should make the library a lot more accessible for people