Scalafmt does not preserve line breaks in single line nested for and if

[vicaba]

Hello,

I am trying to set up scalafmt scala 3 project.

Somewhere in the code, inside a def I have:

for row <- zeroCells.rows.indices do 
  if zeroCells.rows(row) == 1 then 
    for col <- m(row).indices do 
      m(row)(col) = 0

However, when I format with scalafmt, it is rewritten as:

for row <- zeroCells.rows.indices do if zeroCells.rows(row) == 1 then for col <- m(row).indices do m(row)(col) = 0

which is hard to read. I'd like to preserve this sort of line break and indentation (the original snippet I've shown). Scalafmt does seem to format the following snippet as I expect (see, however, that I have added two println to transform the blocks inside to multiline):

for col <- zeroCells.cols.indices do
  if zeroCells.cols(col) == 1 then
    println("a") // This was added
    for row <- m.indices do
      println("b") // This was added
      m(row)(col) = 0

I have seen this similar issue from 2016: #366, but most of the links are broken, and I can no longer find the directive

keepSelectChainLineBreaks = true

in the documentation for scalafmt 3.7.4. It also may be that what I am looking for is not related to the issue #366, since my issue is not really related with chains.

Is there a directive I am missing to achieve the expected behavior?

Thank you.

[kitbellew]

@vicaba rather than searching through old issues, I'd recommend re-reading the documentation. One option is: https://scalameta.org/scalafmt/docs/configuration.html#newlinessource

[vicaba]

Thank you.
I indeed searched the docs, but missed that part. Then, the only thing I could find was that old issue. My apologies.
I have "fixed" that problem now and others, but still battling with some other formatting directives. I will keep trying for the rest of the week.