Enforcing formatting of TOML files

[atouchet]

Currently having consistent formatting is not enforced for TOML files and as a result they have tended to become a bit disorganized. I have manually cleaned up a number of them recently to have mostly consistent formatting but things still aren't quite perfect. Would there be any interest in enforcing formatting standards for these files or would that just be more of a nuisance?

[jdm]

If there's automatic tooling for it, I think it would be useful.

[atouchet]

This GitHub issue appears to have some related info about tooling: toml-lang/toml#532

[SimonSapin]

This could be integrated with ./mach test-tidy for checking and ./mach fmt for auto-formatting. As long as the latter makes the former pass, I think it’s fine to add formatting checks.

[atouchet]

It looks like the IntelliJ Rust plugin did something similar to this. It might be worth looking at:

intellij-rust/intellij-rust#5518
intellij-rust/intellij-rust#5536