.scalafmt.conf

version = 3.9.4

// alignment is cute. i think it helps readability overall, but sometimes it produces silly results. consider restructuring code in those cases
align.preset = more

// 120 is chosen mostly because it seems to be a length at which the automatic wrapping very rarely bothers me.
// use manual linebreaks to emphasize the structure of your code.
maxColumn = 120
newlines.source = keep

// trailing commas are nice, because they are systematic – copy and reorder lines without worries.
// at the same time, a lot of code does not change often, so the additional commas are just noise.
// use good judgement
rewrite.trailingCommas.style = keep

// new control syntax (i.e., if ... then ... else) is just nicer
// varargs, imports, and wildcards no longer overload _ for everything
rewrite.scala3.convertToNewSyntax = true

// leaving out braces for short examples (particularly slides & papers) is great
// however, at some point not having braces makes structure hard to read (at least for me)
// not sure what a good limit is, but this is about ~1 screen height which seems like an OK conservative estimate
rewrite.insertBraces.minLines = 42

// docstrings are the scaladoc comments (using /** */)
// single line folding reduces empty lines.
// wrapping is disabled because I do not believe in forcing word-wrap for flow text – use good judgement
docstrings.oneline = fold
docstrings.wrap = no

// one line per import just produces insanely long headers, though it is more convenient for modifications.
// unsure on what is best here, but for now, I read files more often than I have to edit their imports.
importSelectors = singleLine

// the following cause operands on separate lines to have the same indentation
// naming is based on the default being indentation, and these “enable” no indentation
// https://scalameta.org/scalafmt/docs/configuration.html#indentoperator
indentOperator.exemptScope = all
indentOperator.includeRegex = "^.*=$"
indentOperator.excludeRegex = "^$"


// scala 2, scala 3, and sbt all use slightly different variants on scala syntax
// this defaults to scala 3 syntax, but has some well-known exceptions
runner.dialect = scala36

fileOverride {
	"glob:**/scala-2/**" {
		runner.dialect = scala213
	}
	"glob:**/*.sbt" {
		runner.dialect = sbt1
	}
	// project files are sbt projects, sbt always uses scala 2.12
	"glob:**/project/*.scala" {
		runner.dialect = scala212source3
	}
	// ensure that scala files in source are scala3 even if they are in a folder called "project"
	"glob:**/src/*/scala/**/*.scala" {
		runner.dialect = scala36
	}
}