Is there a setting to add trailing commas to function arguments when reformatting? Adding them to th...

# intellij

[bod]

Is there a setting to add trailing commas to function arguments when reformatting? Adding them to the parameter declarations works.

Before:

fun f(
      a: Int,
      b: Int
  ) {
  }

  val a = f(
      1,
      2
  )

After:

fun f(
      a: Int,
      b: Int, // \o/ 
  ) {
  }

  val a = f(
      1,
      2  // :(
  )

[wasyl]

Deleted my original message, I was under impression that trailing commas code style setting should apply everywhere where trailing commas are supported. But I found IJ formatter to quite buggy wrt trailing commas and I rely on ktlint to add them when needed

[bod]

Hmm sad. Do you use ktlint in the IDE (is there a plugin maybe?)

[David Kubecka]

I wanted to reply with an IDE setting but it apparently disappeared in recent version 😞 I too use ktlint for formatting and yes there is a ktlint IDE plugin which can autoformat your code on save based on your editorconfig settings.

[David Kubecka]

See also #CKS3XG0LS for further questions.

[bod]

all right thanks! I'll check it out. (These commas are really handy especially with Compose where you tend to have functions with dozens of arguments 😅)

[Daniel Pitts]

Using .editorconfig has been the most consistent way I've seen.

[bod]

@Daniel Pitts does that support trailing commas? I don't see anything about it here

[Daniel Pitts]

There are some intellij extensions... let me see if I can find them.

[Daniel Pitts]

ij_kotlin_allow_trailing_comma = true
ij_kotlin_allow_trailing_comma_on_call_site = false

[bod]

ij_kotlin_allow_trailing_comma_on_call_site looks promising!

[Daniel Pitts]

If you create a .editorconfig file, and put in [*.kt] , you can then use intellij's "generate" hotkey (⌘N on Mac) and it will give you the open to create all of the possible keys that intellij knows about.

[Daniel Pitts]

On my machine, it created 84

[bod]

wow!

[bod]

thanks a lot! I'll check that out 🙂

[wasyl]

It also autocompletes nicely so you can type ij and/or kt and you'll see possible options. But fwiw editorconfig is pretty broken as well ☹️

[bod]

all right it looks like this is a winner!

just created a .editorconfig file and put this inside:

[*.kt]
ij_kotlin_allow_trailing_comma_on_call_site = true

then reopened my project, now cmd+alt+L adds the sweet commas 🎉

Thanks all 🙏