scalameta/scalafmt

Code formatter for Scala

Tomasz Godzik

@tgodzik

@sken77 that is done using scalafix, so it should already work with the sbt scalafix plugin

the only thing you need is to add that rule

alternatively we will also work on having that runable via Metals, so it should be possible to do via shortcut/command

https://scalacenter.github.io/scalafix/

ex0ns

@ex0ns

Hello !
I'm struggling a bit to configure scalafmt to an existing style of a scala project (I don't want to change the style of the whole project, I'm trying to match it as close as possible). We have a lot of case classes that look like that:

I would like the : and = to be aligned. I don't mind too much about the position of the first argument, I guess it could be right after ( depending on the maxColumn setting, same for the extends.
I tried

version = "2.7.4"

preset = default
align.preset = more
align.openParenDefnSite = false

maxColumn = 80

but the result is not correct for the parameters of my case classes

Tomasz Godzik

@tgodzik

What if you try:

align.preset = more
align.multiline = true

3 replies

also maybe use preset = most or https://scalameta.org/scalafmt/docs/configuration.html#aligntokens might help

ex0ns

@ex0ns

4 replies

Eric K Richardson

@ekrich

That looks pretty good, is that what you wanted?

ex0ns

@ex0ns

It seems that align.openParenDefnSite = true is not respected here and I can't find a way to put the parenthesis one the same line as the extends, but thank for the pointers @tgodzik

Eric K Richardson

@ekrich

I am confused on that one too as we have a codebase I'd like to upgrade scalafmt but it causes lots of changes. see here for related settings - https://github.com/scala-native/scala-native/blob/master/.scalafmt.conf

Eric K Richardson

@ekrich

I don't really like the openParen or align more or most much. You add or remove one thing and now you get a bunch of whitespace changes. I also am not sure why the default is all vertical except when you go to Scala 3 "significant whitespace". Formatting in a standard way is perfectly fine but this becomes a bikeshed and then nobody is happy and many people don't adopt scalafmt. They don't want a bunch of whitespace changes but this really has no basis for rebase or merge in git so I don't get it. Sorry about the rant. Look at the version above - hard to upgrade.

Stewart Stewart

@stewSquared

Is there an issue tracking optional braces?
I don't see any links in scalameta/scalafmt#2212
~~Also, might you know of related issues to watch in other repos? (like emacs scala-mode or vscode scala-syntax)~~
Actually, just found these:
vs code: scala/vscode-scala-syntax#179
emacs: hvesalai/emacs-scala-mode#160

Tomasz Godzik

@tgodzik

@stewSquared everything related to optional braces is being tracke here scalameta/scalafmt#2216

I already have some ideas around it, but need to fix some mroe things in the parser

@2m:matrix.org

[m]

I am trying to use the latest scalafmt snapshot, but I am getting a following error:

Invalid version: 2.7.5+202-ace91064-SNAPSHOT

Should I format the version string a bit differently?

Tomasz Godzik

@tgodzik

I think that is due to the lack of resolver

not sure if it's possible to add the resolver to config

as a workaround you could use coursier to download the version from the sonatype snapshots repo

@2m:matrix.org

Eric K Richardson

@ekrich

@tgodzik I know you are super busy but have you had a chance to look at Scala Native scalafmt? Does it still use metaconfig? Maybe I could do a PR on that. Also, is paiges still used/getting updated anymore, looks a little old?

At one time Olafur was talking about a new formatter for scalafmt but said it was too much work - was that using paiges or pretty-print?

Tomasz Godzik

@tgodzik

@ekrich this is certainly on my mind, but I haven't looked into it yet :/ paiges seems not used anymore, I am not even sure what was it needed for

metaconfig on the other hand seems to be sued kind of all over the place

Eric K Richardson

@ekrich

I noticed Scala.js is commented out - do we need that for metaconfig or just native?

I can try and do that.

Tomasz Godzik

@tgodzik

no idea really, I only recently started working on it. I think JS was not that improtant

hmm... you meant that metaconfig was using paiges, maybe we can replace it with pprint

Eric K Richardson

@ekrich

Yeah, I see both in that build.

Let me see if I can get the native stuff in there and then we can go from there.

It was in there at one time.

Tomasz Godzik

@tgodzik

In the meantime I remove paiges from scalafmt scalameta/scalafmt#2398

Eric K Richardson

@ekrich

Ok, I commented out - we could update it - pprint now support 2.11 again thanks to jodersky probably which is really helpful.

The cli looks like it uses paiges - I could update if Olafur thinks it is worth it - did we give up on it and just use pprint?

Eric K Richardson

@ekrich

paiges is typelevel sorry - they dropped 2.11.

no native support

Tomasz Godzik

@tgodzik

We need to probably replace it with pprint for native - either repalce it altogether or just for native and create some compat classes

might be good to get some feedback from Olaf

Eric K Richardson

@ekrich

yeah, that is probably not that much - scalacheck-shapeless skips 2.11 for sjs 1 other stuff too.

Tomasz Godzik

@tgodzik

is shapeless used anywhere in scalafmt :O ?

Eric K Richardson

@ekrich

I think when lihaoyi dropped 2.11 it created a ripple downstream

Tomasz Godzik

@tgodzik

I don’t think paiges can easily be replaced with pprint.
It would be easier to inline the sources of paiges
Paiges has automated ci releases so it might also be worth trying to fix its cross-build.

citing Olaf

I asked him on discord

Eric K Richardson

@ekrich

Ok, it looks like typelevel has dropped 2.11 in release 0.4.0 would that be ok?

Sander Dijkhuis

@sander

How can I avoid the \n before _ in:

  class TsecLive[F[
      _]: Monad, HashAlgorithm, HmacAlgorithm, AuthCipher, AuthCipherSecretKey[
      _]](nonceSize: Int)(implicit
      val hasher: CryptoHasher[F, HashAlgorithm],

Tomasz Godzik

@tgodzik

@sander I think you can break if manually before F, which should put it all on the second line? We've been actually working on making long types work better, but that might come in 3.0.0

also not sure if it would solve your particular issue

Sander Dijkhuis

@sander

In this case that didn't work, possibly due to setting newlines { source = fold }

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