sbt：子項目的動態聚合

Question

我想發明一個系統到動態發現子項目並將它們自動聚合到我的項目中。或者至少配置這個不知何故。

要做到這一點，我打算有一個「模塊」文件夾或可選配置文件包含模塊的路徑。

在任何情況下我需要通過子文件夾環路（或環路通過從配置文件路徑的列表），並聚集各子項目。我不知道該怎麼做。

目前我正在建立Play框架與build.sbt文件。我需要添加這樣的循環：

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) 
} 

有沒有辦法做到這一點？

編輯3： 這裏的代碼幾乎工作：

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:_*) 
} 

編輯4：下面

見戴爾Wijnand的解決方案。

關於錯誤：RuntimeException: No project 'myModule' in 'file:/Users/me/mysite/modules/myModule'。我解決了這個使用該解決方案從https://stackoverflow.com/a/28820578

Answer 1

這裏：

項目/ 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 
} 

注意事項，確保模塊目錄不還含有build.sbt文件定義他們爲項目，這將導致混亂RuntimeException: No project 'x' in 'file:/x'類型例外情況，請參閱Can't use sbt 0.13.7 with Play subprojects

Answer 2

你可以嘗試這樣的事情：

import sbt._ 
import sbt.Keys._ 

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

object Build extends Build { 

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

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

    override lazy val projects = root +: modules 
} 

注：通過戴爾的回答啓發，但我不得不刪除「commonSettings」，否則它不會爲我工作。