Edit

Gotchas

Scalafmt tries to automatically reformat as much as possible. However, sometimes you need to help scalafmt decide how to format your code.

Infix applications

Infix applications are methods calls that use the syntax like a + b instead of a.+(b).

Scalafmt preserves your line breaks in infix applications, even if this means the maxColumn setting is not respected.

// column limit |
// if you have long infix applications
a.b(c) && d.e(f, g, h)

// then scalafmt may format like this
a.b(c) && d.e(
  f, g, h)

// which is ugly. You can fix it by inserting
// a newline after && and it will look like this
a.b(c) &&
  d.e(f, g, h)

Config style

You can use "config style" to tell scalafmt to break a function application.

// Put newline after opening (
// and newline before closing )
// to force one argument on each line.

// OK: Config style
function(
  longerArg1 = defaultValue1,
  longerArg2 = defaultValue2,
  longerArg3 = defaultValue3
)
// NOT Config style
function(longerArg1 = defaultValue1,
          longerArg2 = defaultValue2,
          longerArg3 = defaultValue3)