scala - 代码格式:如何在理解中对齐<-？

Question

我有这样的for comprehension:

 private[helper] def myMethod(name: String, index: Long) = {
   for {
  result1  <- httpUtilities.getLowIndexes(index)
  result2    <- myFacade.queryMaterial(result1)
  result3 <- httpUtilities.someMethod(result2)
  } yield result3
 }

我想要的是在列中对齐特殊字符 <-，以便将上面的代码转换为:

private[helper] def myMethod(name: String, index: Long) = {
   for {
      result1  <- httpUtilities.getLowIndexes(index)
      result2  <- myFacade.queryMaterial(result1)
      result3  <- httpUtilities.someMethod(result2)
  } yield result3
 }

我可以在设置->代码样式-> Scala =>包装和花括号->'match'和'case'语句->在Intellij中的'case'列中对齐来对区分大小写的语句执行相同的操作 <-中的 for-comprehension字符。

Answer 1

Scalafmt可以完全做到这一点，它可以作为IDEA plugin来使用，也可以通过许多其他方式打包。

您想使用align=more功能as documented here。该文档显示了以下对齐示例:

val x  = 2 // true for assignment
val xx = 22

case object B  extends A // false for `extends`
case object BB extends A

q  -> 22 // true for various infix operators
qq -> 3  // and also comments!

for {
  x  <- List(1) // true for alignment enumerator
  yy <- List(2)
} yield x ** xx

x match { // true for multiple tokens across multiple lines
  case 1  => 1  -> 2  // first
  case 11 => 11 -> 22 // second

  // A blank line separates alignment blocks.
  case `ignoreMe` => 111 -> 222
}

// Align assignments of similar type.
def name   = column[String]("name")
def status = column[Int]("status")
val x      = 1
val xx     = 22

// Align sbt module IDs.
libraryDependencies ++= Seq(
  "org.scala-lang" % "scala-compiler" % scalaVersion.value,
  "com.lihaoyi"    %% "sourcecode"    % "0.1.1"
)