Reformat source files

[exarkun]

I'm not sure about this. I added a fourmolu configuration but I don't know if we can make the fourmolu pre-commit hook respect it.

[meejah]

I don't have enough Haskell experience to have good opinions on "proper formatting" but what do you mean about the pre-commit hook thing? (I don't see any hooks set up / edited in this PR).

I strongly prefer a pre-push hook in general: I often commit things that don't fully work and getting slowed down by "reformat it right now" sucks. Usually the important piece here is to not put "un-formatted" code into a PR (so that's why I like pre-push for these; remind you if your code isn't formatted when pushing).

That said, "in general" automated formatting is good so the style is consistent, so +1 from me there :)

[exarkun]

I don't have enough Haskell experience to have good opinions on "proper formatting"

Yea, neither do I, I think. But I guess anything that fourmolu spits out is probably going to be better than a free for all.

but what do you mean about the pre-commit hook thing? (I don't see any hooks set up / edited in this PR).

Indeed. The hooks can be set up by the flake added in #32 but there is none in master yet. These changes I got by running fourmolu by hand.

I strongly prefer a pre-push hook in general: I often commit things that don't fully work and getting slowed down by "reformat it right now" sucks. Usually the important piece here is to not put "un-formatted" code into a PR (so that's why I like pre-push for these; remind you if your code isn't formatted when pushing).

Yea, that workflow makes sense to me as well. The pre-commit thing that #32 pulls in lets us make the hooks into a pre-push hook if we want - and I'd be on-board with doing that.