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在多项目中,将设置放置在文件或公用设置中有什么区别?

sbt-plugin sbt-assembly sbt

2

igx · 技术社区 · 6 年前

初学者的问题是,我有一个多项目的SBT文件,如果我把常规设置放在文件的开头,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公共设置中

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?

1 回复 | 直到 6 年前

1

2

Ivan Stanislavciuc 6 年前

未将其附加到特定项目的设置中定义的任何设置,即 .settings() ,附加到根项目。

这样的代码

organization := "foo"

一样

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

现在,如果您定义了一个新的子项目 common 并添加 organization 对它

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

只有它才有价值 组织 设置为 bar .

当根项目有自己的根项目时,这将在示例中保持。 组织 也定义了。

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

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

这很容易用命令进行测试 sbt "show organization" 和 sbt "show common/organization" . 它会打印出来 foo 和 酒吧 分别。

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

organization in ThisBuild := "foo"

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

或将设置存储在 Seq 并应用于所有子项目和根。这与范围内的效果类似 这种构建 但更明确的是:

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

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