如何在使用它的项目的多项目构建中开发 sbt 插件？

是否可以在多项目设置中构建 sbt 插件，并在同一多项目的其他子项目中使用该插件？

例如：

root/
+  mySbtPlugin/
+  myProject/
   +  project/
      +  plugins.sbt    // Uses `mySbtPlugin`

It is not可能的，因为为单个或多模块项目定义插件的唯一方法是通过project（元）构建。当我使用您描述的布局设置沙箱环境时，我再次被欺骗为您提供解决方案。

sbt 允许project（元）项目仅位于根目录中。没有其他project目录被处理并成为构建定义的一部分。

这就是为什么你最好的（也是唯一的）选择是构建多模块myProject and mySbtPlugin为了简化您的开发，并仅为您真正想要的这些项目启用插件（请小心自动插件 http://typesafe.com/blog/preview-of-upcoming-sbt-10-features-read-about-the-new-plugins， 尽管）。

项目/plugins.sbt

lazy val root = (project in file(".")) dependsOn sbtNonamePlugin

lazy val sbtNonamePlugin = ProjectRef(file("../sbt-noname"), "sbt-noname")

addSbtPlugin("pl.japila" % "sbt-noname" % "1.0")

构建.sbt

lazy val `my-project`, `sbt-noname` = project

sbt-noname/build.sbt

sbtPlugin := true

name := "sbt-noname"

organization := "pl.japila"

version := "1.0"

sbt-noname/src/main/scala/sbtnoname/Plugin.scala

package sbtnoname

import sbt._
import plugins._

object Plugin extends AutoPlugin {

  override def trigger = allRequirements

  override val projectSettings: Seq[Setting[_]] = inConfig(Test)(baseNonameSettings)

  lazy val sayHello = taskKey[Unit]("Say hello")

  lazy val baseNonameSettings: Seq[sbt.Def.Setting[_]] = Seq(
    sayHello := {
      println("I'm the plugin to say hello")
    }
  )
}

有了上面的文件，运行sbt.

> about
[info] This is sbt 0.13.6-SNAPSHOT
[info] The current project is {file:/Users/jacek/sandbox/multi-plugin/}my-project 0.1-SNAPSHOT
[info] The current project is built against Scala 2.10.4
[info] Available Plugins: sbt.plugins.IvyPlugin, sbt.plugins.JvmPlugin, sbt.plugins.CorePlugin, sbt.plugins.JUnitXmlReportPlugin, sbtnoname.Plugin, com.timushev.sbt.updates.UpdatesPlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.4
> projects
[info] In file:/Users/jacek/sandbox/multi-plugin/
[info]   * multi-plugin
[info]     my-project
[info]     sbt-noname
> plugins
In file:/Users/jacek/sandbox/multi-plugin/
    sbt.plugins.IvyPlugin: enabled in multi-plugin, sbt-noname, my-project
    sbt.plugins.JvmPlugin: enabled in multi-plugin, sbt-noname, my-project
    sbt.plugins.CorePlugin: enabled in multi-plugin, sbt-noname, my-project
    sbt.plugins.JUnitXmlReportPlugin: enabled in multi-plugin, sbt-noname, my-project
    sbtnoname.Plugin: enabled in multi-plugin, sbt-noname, my-project
> my-project/test:sayHello
I'm the plugin to say hello
[success] Total time: 0 s, completed Jun 15, 2014 3:49:50 PM