Stop conversion to single lines for short control flow blocks

[spaceunifyfifty]

for short blocks, scalafmt is auto-formatting

if x then
  println("y")

as

if x then println("y")

and likewise

for i <- 1 to 10 do
  println("y")

becomes

for i <- 1 to 10 do println("y")

How can I disable this opinionated style correction while still keeping other basic scalafmt features like indentation-size correction? I do not want to disable scalafmt entirely, but I will have to if this is not possible.

[tgodzik]

Does newlines.source = keep setting help in you case?

[spaceunifyfifty]

No, this did not work. This is why a preset with all rules disabled is a good idea; so developers don't need to trial-and-error all rules that sound like they kinda maybe possibly might be responsible for the unwanted corrections.

[kitbellew]

1. when you say "it didn't work", can you show what was produced (and what you configured)?
2. the tool is not a collection of configurable rules (although there are some, like rewrites, which can be enabled); for the most part, it will always apply some formatting changes but they can be slightly configured in how exactly they will behave (but there's no way to turn it off).

what you are asking for is currently impossible; each "rule" sets its own indentation policies, depending on where it will impose a break, and if there is no rule, then there's no indentation, since we don't know where you have imposed breaks.

however, newlines.source = keep is a work-in-progress attempt to preserve some (where possible) breaks that the user has introduced. if "it doesn't work", it is either because this case has not been implemented yet (which is why you could show what you did), or because it contradicts some other assumptions and newline cannot be preserved.

[spaceunifyfifty]

Here is my .scalafmt

version = "3.7.15"
runner.dialect = scala3
indent.main = 2
indent.callSite = 2
newlines.source = keep 

What is produced is that

if true then 
  println("ok")

turns into

if true then println("ok")