Support formatting in VS Code

[torhovland]

TOML would be a good candidate for this, as it is a simple language to support (see #69), and because it isn't covered by widely used formatters already (toml-lang/toml#532).

[aspiwack]

I don't understand what this issue is about. Can you say more?

[torhovland]

The idea is to be able to run our formatter on the "Format on Save" feature in VS Code. This means we need a VS Code extension that registers the formatter. It would be nice if we could hook into an existing extension, and just configure the path (and command line args) to our formatter, but I don't know if an extension like that exists.

[aspiwack]

I see.

This is not something that is required for a first release. Let's think about extensions for editors in a second step.

[torhovland]

Agreed. This was meant more as a validation of the engine for practical use. For example, we may have to support supplying the input path as a command line argument, not just pipe from stdin.

[nbacquey]

Superseded by #655