Sbt 将设置放在文件中或多项目的 commonSettings 中有什么区别

Question

初学者问题，我有一个多项目sbt文件，如果我把通用设置放在文件的开头会有什么不同吗？例如：

organization := "com.example"
  version := "0.0.1-SNAPSHOT"
  scalaVersion := "2.11.12"
resolvers ++= Seq(
    "Apache Development Snapshot Repository" at "https://repository.apache.org/content/repositories/snapshots/",
    "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/",

    Resolver.mavenLocal
  )
assemblyMergeStrategy in assembly := {
    case PathList("META-INF", xs @ _*) => MergeStrategy.discard
    case x => MergeStrategy.first
  }
lazy val commonSettings  = Seq(  libraryDependencies ++= commonDependencies ++ testingDependencies)
lazy val sharedProject = (project in file(...))
.settings(commonSettings: _*)
val projectA = .....dependsOn(sharedPorject)
val projectB = .....dependsOn(sharedPorject)

或者如果我把它放在常用设置里

lazy val commonSettings  = Seq(  
organization := "com.example",
  version := "0.0.1-SNAPSHOT",
  scalaVersion := "2.11.12",
resolvers ++= Seq(
    "Apache Development Snapshot Repository" at "https://repository.apache.org/content/repositories/snapshots/",
    "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/",
    Resolver.mavenLocal
  ),
assemblyMergeStrategy in assembly := {
    case PathList("META-INF", xs @ _*) => MergeStrategy.discard
    case x => MergeStrategy.first
  },
libraryDependencies ++= commonDependencies ++ testingDependencies)
lazy val sharedProject = (project in file(...))
.settings(commonSettings: _*)
val projectA = .....dependsOn(sharedPorject)
val projectB = .....dependsOn(sharedPorject)

有什么区别？

Answer 1

任何未附加到特定项目设置的定义设置，即 .settings()，都附加到根项目。

这样的代码

organization := "foo"

与

相同

lazy val root = (project in file(".")).settings(organization := "foo")

现在，如果您定义了一个新的子项目，如 common 并向其添加 organization

lazy val common = (project in file("common")).settings(organization := "bar")

只有它会将值 organization 设置为 bar。

当根项目也有自己的 organization 定义时，这将适用于示例。

lazy val root = (project in file(".")).settings(organization := "foo")

lazy val common = (project in file("common")).settings(organization := "bar")

这很容易用命令 sbt "show organization" 和 sbt "show common/organization" 进行测试。它将分别打印 foo 和 bar。

最后，如果您希望为所有子项目定义相同的值，请在根项目中为范围 ThisBuild 添加设置，如本例所示：

organization in ThisBuild := "foo"

lazy val common = (project in file("common")).settings(???)

或者将设置存储在 Seq 中并将其应用于所有子项目和根。这将具有与范围 ThisBuild 类似的效果，但更明确一点：

val commonSettings = Seq(organization := "foo")

lazy val root = (project in file(".")).settings(commonSettings)
lazy val common = (project in file("common")).settings(commonSettings)

Sbt 将设置放在文件中或多项目的 commonSettings 中有什么区别

Sbt what is the difference placing settings in the file or in commonSettings in multi project

sbt

sbt-assembly

sbt-plugin