How to make brittany format data declarations?

Nobody has claimed this yet.

I'm thinking of what it would take to make brittany format data declarations as well. I've looked at the high-level descriptions and have skimmed the source code.

The source code is a bit difficult to navigate since I don't know which files or directories have what function. There also don't seem to be comments indicating which file / function / case branch relates to what kind of language elements.

My first attempt at extending brittany would be to copy-past some existing code, re-using e.g. `let` or `case` expressions to format `data` statements, and making this work in simple cases. The errors and misfortunes I'd encounter would help me learn more about brittany, in the best traditions of cargo-cult programming. Would this stand some chance of success?

Start with the high-level descriptions and map the source tree, since the issue does not identify files, functions, or tests for language elements. Investigate how existing let and case formatting is organized before assessing whether data declarations can be supported. Done would mean formatting simple data statements, with the required scope and validation still to be defined.

Written by the indexing model from the issue text.