在 sbt 中，如何在所有配置中覆盖控制台的 scalacOptions？

Question

我喜欢像这样在顶层定义scalacOptions（例如，暂时忽略项目轴）：

scalacOptions += "-Ywarn-unused-import"

但后来我意识到这对console 来说太严格了。所以我尝试设置：

scalacOptions in console ~= (_ filterNot (_ == "-Ywarn-unused-import"))

但这不起作用（在 REPL 中仍然收到（致命的）警告）。

我使用inspect 尝试了解原因：

> inspect console
[info] Task: Unit
[info] Description:
[info]  Starts the Scala interpreter with the project classes on the classpath.
[info] Provided by:
[info]  {file:/a/}b/compile:console
[info] Defined at:
[info]  (sbt.Defaults) Defaults.scala:261
[info] Dependencies:
[info]  compile:console::compilers
[info]  compile:console::initialCommands
[info]  compile:console::fullClasspath
[info]  compile:console::taskTemporaryDirectory
[info]  compile:console::scalaInstance
[info]  compile:console::streams
[info]  compile:console::cleanupCommands
[info]  compile:console::scalacOptions
[info] Delegates:
[info]  compile:console
[info]  *:console
[info]  {.}/compile:console
[info]  {.}/*:console
[info]  */compile:console
[info]  */*:console
[info] Related:
[info]  test:console

注意：console 是

• 由compile:console提供
• 取决于compile:console::scalacOptions

然后：

> inspect compile:console::scalacOptions
[info] Task: scala.collection.Seq[java.lang.String]
[info] Description:
[info]  Options for the Scala compiler.
[info] Provided by:
[info]  {file:/a/}b/compile:scalacOptions
[info] Defined at:
[info]  (sbt.Classpaths) Defaults.scala:1593
[info] Reverse dependencies:
[info]  compile:console
[info] Delegates:
[info]  compile:console::scalacOptions
[info]  compile:scalacOptions
[info]  *:console::scalacOptions
[info]  *:scalacOptions
[info]  {.}/compile:console::scalacOptions
[info]  {.}/compile:scalacOptions
[info]  {.}/*:console::scalacOptions
[info]  {.}/*:scalacOptions
[info]  */compile:console::scalacOptions
[info]  */compile:scalacOptions
[info]  */*:console::scalacOptions
[info]  */*:scalacOptions
[info] Related:
[info]  *:console::scalacOptions
[info]  compile:scalacOptions
[info]  *:scalacOptions
[info]  */*:scalacOptions
[info]  test:scalacOptions

注意：compile:console::scalacOptions 是

• 由compile:scalacOptions提供
• 在委托链中没有到达*:console::scalacOptions（这是我定义的）

我的问题是如何为控制台的所有配置覆盖scalacOptions？是否可以更改委托链？

我想避免必须设置 scalacOptions in (Compile, console)（因为它会为 (Test, console) 重复）或定义一个 val scalac 选项。

Answer 1

我的问题是如何为控制台的所有配置覆盖scalacOptions？

我认为我们不能提供 sbt 的 Defaults 提供的 compile:scalacOptions。唯一具有更高优先级的范围是compile:console::scalacOptions。 在大多数情况下，人们不希望 Compile 和 Test 设置跨线，因此我认为配置范围更高的优先级并不是一个糟糕的默认设置。

lazy val commonSettings = Seq(
  scalaVersion := "2.11.4",
  scalacOptions += "-Ywarn-unused-import",
  scalacOptions in (Compile, console) ~= (_ filterNot (_ == "-Ywarn-unused-import")),
  scalacOptions in (Test, console) := (scalacOptions in (Compile, console)).value
)

是否可以更改委托链？

不，这是不可能的。 在BuildStructure 中有一个delegates 函数实例，它在加载时初始化并用于所有任务。 订购在Scope.delegates完成。

Answer 2

我修复了自动插件中的错误 scalac 选项：

package console

import sbt._

/** [[FixScalacOptionsInConsole]] is an [[AutoPlugin]] that removes
  * noisy or unnecessary scalac options when running an sbt console.
  */
object FixScalacOptionsInConsole extends AutoPlugin {

  import Keys._

  override def requires = plugins.JvmPlugin
  override def trigger = allRequirements

  override lazy val projectSettings = Seq(
    Compile / console / scalacOptions ~= filter,
    Test / console / scalacOptions ~= filter
  )

  def filter: Seq[String] => Seq[String] =
    _ .filterNot(_ == "-feature")
      .filterNot(_.startsWith("-opt:"))
      .filterNot(_ == "-unchecked")
      .filterNot(_.startsWith("-Xlint:"))
      .filterNot(_ == "-Xfatal-warnings")
      .filterNot(_.startsWith("-Ywarn"))
}