scala – SBT – 使用汇编时的多项目合并策略和构建sbt结构

>创建仅由根/容器项目使用的rootSettings,因为它通常不是程序集或发布步骤的一部分.它将包含以下内容：

lazy val rootSettings := Seq(
  publishArtifact := false,publishArtifact in Test := false
)

>创建所有子项目共享的commonSettings.在此处放置基本/共享装配设置：

lazy val commonSettings := Seq(

  // We use a common directory for all of the artifacts
  assemblyOutputPath in assembly := baseDirectory.value /
    "assembly" / (name.value + "-" + version.value + ".jar"),// This is really a one-time,global setting if all projects
  // use the same folder,but should be here if modified for
  // per-project paths.
  cleanFiles <+= baseDirectory { base => base / "assembly" },test in assembly := {},assemblyMergeStrategy in assembly := {
    case "BUILD" => MergeStrategy.discard
    case "logback.xml" => MergeStrategy.first
    case other: Any => MergeStrategy.defaultMergeStrategy(other)
  },assemblyExcludedJars in assembly := {
    val cp = (fullClasspath in assembly).value
    cp filter { _.data.getName.matches(".*finatra-scalap-compiler-deps.*") }
  }
)

>每个子项目使用commonSettings,并应用特定于项目的覆盖：

lazy val fubar = project.in(file("fubar-folder-name"))
  .settings(commonSettings: _*)
  .settings(
    // Project-specific settings here.
    assemblyMergeStrategy in assembly := {
      // The fubar-specific strategy
      case "fubar.txt" => MergeStrategy.discard
      case other: Any =>
        // Apply inherited "common" strategy
        val oldStrategy = (assemblyMergeStrategy in assembly).value
        oldStrategy(other)
    }
  )
  .dependsOn(
    yourCoreProject,// ...
  )

> BTW,如果使用IntelliJ.不要命名根项目变量root,因为这是最近项目菜单中显示为项目名称的内容.

lazy val myProjectRoot = project.in(file("."))
  .settings(rootSettings: _*)
  .settings(
    // ...
  )
  .dependsOn(
    // ...
  )
  .aggregate(
    fubar,// ...
  )

您可能还需要添加自定义策略来组合reference.conf文件(对于Typesafe配置库)：

val reverseConcat: sbtassembly.MergeStrategy = new sbtassembly.MergeStrategy {
  val name = "reverseConcat"
  def apply(tempDir: File,path: String,files: Seq[File]): Either[String,Seq[(File,String)]] =
    MergeStrategy.concat(tempDir,path,files.reverse)
}

assemblyMergeStrategy in assembly := {
  case "reference.conf" => reverseConcat
  case other => MergeStrategy.defaultMergeStrategy(other)
}