sbt:子项目的动态聚合

Question

我想发明一个系统来动态发现子项目并自动将它们聚合到我的项目中.或者至少以某种方式配置它.

为此,我计划拥有一个"modules"文件夹或一个包含模块路径的可选配置文件.

在任何情况下,我都需要遍历子文件夹(或循环遍历配置文件中的路径列表),并聚合每个子项目.我不知道该怎么做.

目前我正在使用该build.sbt文件在Play框架中构建.我需要像这样添加循环:

name := "mysite"
version := "1.0"
scalaVersion := "2.11.1"
lazy val root = (project in file(".")).enablePlugins(PlayJava)
//pseudocode:
foreach( folder in the 'modules' folder) { 
  lazy val module = (project in file(folder)).enablePlugins(PlayJava)
  root = root.dependsOn(module).aggregate(module)
}

有没有办法做到这一点？

编辑3:这里的代码几乎正常工作:

object MyBuild extends Build {
  name := "mysite"
  version := "1.0"
  scalaVersion := "2.11.6"

  var m = new File("modules")
  var list = Seq[ProjectReference]()
  var deps = Seq[ClasspathDependency]()
  if (m.exists) {
    val subs = m.listFiles.filter ( _.isDirectory ).foreach { folder =>
      var modulePath = new File("modules", folder.getName)
      println("Found module " + modulePath)
      lazy val module:ProjectRef = ProjectRef(modulePath,folder.getName)
      lazy val dep:ClasspathDependency = ClasspathDependency(module, None)
      list = list :+ module
      deps = deps :+ dep
    }
  }

  lazy val root = Project(id = "mysite", base = file(".")).enablePlugins(PlayJava).aggregate(list:_*).dependsOn(deps:_*)
}

编辑4:

请参阅下面的Dale Wijnand解决方案.

关于错误:RuntimeException: No project 'myModule' in 'file:/Users/me/mysite/modules/myModule'.我使用/sf/answers/2017440491/中的解决方案解决了这个问题

Answer 1

这里：

项目/Build.scala

import sbt._
import sbt.Keys._

import play.sbt._
import play.sbt.Play.autoImport._

object Build extends Build {
  val commonSettings: Seq[Setting[_]] = Seq(
    scalaVersion := "2.11.7"
  )

  lazy val modules = (file("modules") * DirectoryFilter).get.map { dir =>
    Project(dir.getName, dir).enablePlugins(PlayJava).settings(commonSettings: _*)
  }

  lazy val root = (project in file("."))
    .enablePlugins(PlayJava)
    .settings(
      name := "mysite",
      version := "1.0"
    )
    .settings(commonSettings: _*)
    .dependsOn(modules map (m => m: ClasspathDependency): _*)
    .aggregate(modules map (m => m: ProjectReference): _*)

  override lazy val projects = root +: modules
}

注意，确保模块目录不包含将build.sbt它们定义为项目的文件，因为这会导致令人困惑的RuntimeException: No project 'x' in 'file:/x'类型异常，请参阅Can't use sbt 0.13.7 with Play subprojects