I stumbled on this thread after getting yet another compilation error from shuffling around the values in a long list (obviously, I moved the last one somewhere else in the list).

I think trailing commas are ugly, but they are simply more functional: Cleaner diffs, and makes it easier to shuffle values around.

Thanks for making this project! One less annoyance to babysit.

What do you think about adding tabular code formatting?

And what do you think about making the formatter bringing all clauses to a single line when possible, eg here when the inspect is removed:

case number do
  1 ->
    :one

  2 ->
    :two

  3 ->
    :three

  number ->
    IO.inspect(number)
    :very_big
end

Thanks for your question and interest

I welcome PRs for new features. At first sight, both of these seem acceptable. Care must be taken into when they would trigger or not and have good test coverage.

I personally do not intend to actually write the implementation for any new option. Trailing commas is what I am interested in. It is in my mind a different beast than the rest because it is not about readability or esthetics, it is about ease of editing and about minimizing diffs. I doubt I will propose to my colleagues to use other formatting options.

If someone else writes them, I will gladly review them and maintain them though.