Enable adding languages in Monaco Editor Config for Smart Cells

[clsource]

Hello, I made a simple project to execute another programming language within Livebook

https://github.com/ElixirCL/wren-livebook

Is a modification of the shell smart cell example.

Currently it is using javascript as a syntax highlight, but it would be nice to be able to use a custom syntax highlight.

@impl true
  def init(_attrs, ctx) do
    {:ok, ctx, editor: [attribute: "source", language: "javascript"]}
  end

Searching the forums, it appears is possible to add more languages using #1127 (https://github.com/livebook-dev/livebook/pull/743/files#diff-b08ab52477603a4f946aa108a3d070fa3eeb1b309727fabcfa162ad1a7cf764bR54)
but the question is if its possible to allow adding more syntax highlight configurations inside the livemd file, without requiring to modify the source code of livebook itself.

Thanks! ❤️

[jonatanklosko]

Hey @clsource! The languages we support need to be included in the Livebook bundle, because the editor is always managed by Livebook (as opposed to the custom JavaScript used in Kino.JS, which runs in a sandboxed iframe). The main reason is to provide unified experience and handle collaborative editing automatically. Currently we are open to enabling highlighting for languages that are built into the Monaco editor and are somehow relevant when writing Markdown in Livebook, but there is no way to arbitrarily modify the editor for a specific smart cell.