scalameta/scalafmt

Code formatter for Scala

Georgi Krastev

@joroKr21

Hi, sorry if this has been asked before but it's really hard to search for. Is there a way to configure select chains like this:

1.to(5).map { x =>
  val y =  x + 1
  y * y
}.filter(_ % 2 == 0)

as opposed to:

1.to(5).map { x =>
  val y =  x + 1
  y * y
}
.filter(_ % 2 == 0)

I really dislike the dangling code after a closing curly brace but I couldn't find a way to configure it the way I want

2 replies

rnd4222

@rnd4222_gitlab

Would be cool to be able to disable all formatting and then selectively opt-in for some rules

James Yoo

@jamesyoo_gitlab

Hi folks! Is there a scalafmt setting for enforcing parens around one arg lambdas? e.g.

xs.map { x: T =>
    foo(x)                 // should fail to lint
}

and instead get

xs.map { (x: T) =>
    foo(x)                 // fine
}

I've looked in the docs and issues on GitHub and couldn't find a discussion on this. This is for prepping a codebase to migrate to Scala 3

Matt Hicks

@darkfrog26

is there any way to make Scalafmt remove aligned types? Like:

class Foo(
  one:     Bar,
  another: Baz
)

so that it formats:

class Foo(
  one: Bar,
  another: Baz
)

after running formatting it seems to retain that

Eric K Richardson

@ekrich

Align=more or most are the settings - not sure if that is what you are asking.

Matt Hicks

@darkfrog26

I set alignment:

align = none
align.openParenCallSite = true
align.openParenDefnSite = true
align.stripMargin = true

1 reply

it doesn't appear to remove the spaces in formatting

I want an aggressive reformatting, but scalafmt seems pretty passive

Matt Hicks

@darkfrog26

Ah, nevermind. It was because I wasn't setting the version on Scalafmt, so IntelliJ was formatting with version 1.5.1 by default.

Explicitly setting the version to 2.7.5 fixed it

Matt Hicks

@darkfrog26

is there any way to get:

def foo(
  one: Int,
  two: Int
)

to be formatted as:

def foo(one: Int,
        two: Int)

Eric K Richardson

@ekrich

Let me look scala native uses that one

I think it is in these.

# changed 1.6 or after
align.openParenCallSite = true
align.openParenDefnSite = true
# avoid wrapping parens on new line
danglingParentheses.defnSite = false
danglingParentheses.callSite = false

Sean Romocki

@sromocki

I'm still not able to use scalafmt in IntelliJ and I'm not sure what else to try to get it to work. Seeing

11:34 AM    Can not resolve scalafmt version 2.7.5:
                    An error occurred during downloading:
                    unresolved dependency: org.scalameta#scalafmt-cli_2.12;2.7.5: not found
                    unresolved dependency: org.scala-lang#scala-reflect;2.12.8: not found

6 replies

@theqp

instead of this

  def foo =
    1
      .tap { s =>
        s.toString
      } tap { s =>
      s.toString
    }

I want

  def foo =
    1
      .tap { s =>
        s.toString
      } tap { s =>
        s.toString
      }

4 replies

what should I change in the config?

@theqp

I have found a solution: not mixing infix and dot notation

  def foo2 =
    1 tap { s =>
      s.toString
    } tap { s =>
      s.toString
    }

Philipp Dörfler

@phdoerfler

Hi! I want to use scalafmt on code I generated. My program is currently running on scastie, so I can't have a configuration file. Is there an alternative to scalafmt.format that I can call without a path to a config file? Where can I find the API docs? Thanks!

4 replies

Jason Pickens

@steinybot

Can someone please explain how newlines.topLevelStatementsMinBreaks works? I don’t really understand it. I think I get what the docs say but it doesn’t seem to work how I expect so my interpretation must be wrong. I tried:

newlines {
  topLevelStatements = [before]
  topLevelStatementsMinBreaks = 1
}

And expected a newline before every top level statement but it doesn’t do that. What I actually want is a newline before and after every top level def but I don’t know how to do that.

4 replies

Eric K Richardson

@ekrich

For the most part scalafmt doesn't mess with your blank lines. Those tend to be easy to change and review easily. What are you trying to achieve?

Jason Pickens

@steinybot

I want it to insert new lines before top level defs

Eric K Richardson

@ekrich

I don't see any rewrite rules for that sort of thing.

Jason Pickens

@steinybot

The example for https://scalameta.org/scalafmt/docs/configuration.html#newlinestoplevelstatementsminbreaks seems to be doing something similar

That’s with:

newlines.topLevelStatements = [before,after]
newlines.topLevelStatementsMinBreaks = 0

It does it for all top level statements though which is worse. I’ll just put them in manually, it’s not too bad.

Eric K Richardson

@ekrich

Sorry, I haven't used it before - it seems a bit strange to me too when clicking on before/after.

rc4m

@rc4m

Hi! Is there a way to align the = with the <- in for comprehensions? align.preset=more seems to only align <- with <- and = with =.

rc4m

@rc4m

Found my answer on Discord.

@theqp

hi
scalafmt currently formats like this

    x match {
      case (
            "xxxxxxxxxxxxxxxxxxxxxx" | "xxxxxxxxxxxxxxx" | "xxxxxxxxxxxxxxx" |
            "xxxxxxxxxxxxxxx" | "xxxxxxxxxxxxx"
          ) =>
        y
    }

i want it to look like this

  def loadRow3(): Unit =
    x match {
      case (
            "xxxxxxxxxxxxxxxxxxxxxx"
              | "xxxxxxxxxxxxxxx"
              | "xxxxxxxxxxxxxxx"
              | "xxxxxxxxxxxxxxx"
              | "xxxxxxxxxxxxx"
          ) =>
        y
    }

dieselmat

@dieselmat

hello, I've looked into the documentation and configuration a few times. But fail to see where I could disable the code formatting temporarily via sbt of the scalafmt.conf file. All I fount was // format: off. I'd like to temporarily disable formatting for a quick dev build. Anyone can point out a config for it?

Anton Sviridov

@keynmol

something like https://scalameta.org/scalafmt/docs/installation.html#format-on-compile ?

unless this is turned on in your build, scalafmt shouldn't just reformat the code unprompted

dieselmat

@dieselmat

Thanks! Will try

Artem Nikiforov

@nikiforo

Hi,
By default(I suppose) scalafmt changes this

seqTuple2
  .map { case (a1, a2) =>
    ???
  }

to this

seqTuple2
  .map {
    case (a1, a2) =>
      ???
  }

I've tried to find the way how to turn this feature off couple of times, but with no results.
I've found term case arrows, but not sure if this is what I'm searching.
Can I disable this rewrite rule?

@theqp

i think this is not related to case, but to blocks

Johan Grande

@nahoj

Hi all,
I'm trying to make scalafmt format consecutive parameter blocks (at defn site) in the same way, i.e. to avoid formatting such as:

class MyClass(aaaaaaa: Aaaaaaaaa,
              bbbbbbbbbbbbb: Bbbbbbbbbbbbbbb)
             (implicit ccccccc: Ccccccccc,
              dddddddddddd: Dddddddddddd) extends Eeeeeeee {}

class MyClass(aaaaaaa: Aaaaaaaaa, bbbbbbbbbbbbb: Bbbbbbbbbbbbbbb)(implicit
    ccccccc: Ccccccccc,
    dddddddddddd: Dddddddddddd)
    extends Eeeeeeee {}

here with

align.openParenDefnSite = true
danglingParentheses.defnSite = false

Is this at all possible?

Thai Dang Vu

@dxxvi

Hi All, this is a very basic configuration but I don't know how to do it

object Main extends App {
  println("hello")
  println("world")
}

What should I use in .scalafmt.conf so that there are 4 spaces before the println?

Eric K Richardson

@ekrich

In general, standard Scala formatting uses 2 space indention unlike Java. https://docs.scala-lang.org/style/indentation.html Here are the scalafmt docs: https://scalameta.org/scalafmt/docs/configuration.html You can search for indentation.

Gabriel Volpe

@gvolpe:matrix.org

[m]

Hi folks 👋

Question: is there a workaround to get scalafmt not failing when cross-compiling Scala 2.13.x and 3.0.x? Right now, it fails if I set scalafmtOnCompile := true. I would like to keep running it on Scala 2.12.x and shared code but not for files in the Scala 3.x directory. I tried setting format: off on my Scala 3 file but that didn't work.

I know that Scala 3 support is in progress so all I want is to skip Scala 3 files for now. Thanks!

Anton Sviridov

@keynmol

we did something like

project.excludeFilters = [
   ".*-scala-3.*"
]

in .scalafmt.conf to skip the folders with scala 3 sources (exact regex will need match what you have)

Gabriel Volpe

@gvolpe:matrix.org

[m]

Thanks, I'll give that a try!

hamnis

@hamnis:matrix.org

[m]

hello. I'm looking for an option to add scala-3 like parens to lambdas. is there one for that?

so
Some("foo").map( a => s"bar $a") adds parens around "a"

hamnis

@hamnis:matrix.org

[m]

or is that just when we have Some("foo").map{ (a) => s"bar $a"}

Igal Tabachnik

@hmemcpy

Hello. I was wondering if I could somehow exclude the default case _ => from having its => aligned when using align.tokens?

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