Question

我在将项目迁移到SBT 0.13时遇到问题。

出于某种原因，来自SBT文档的Generate sources的片段对我不起作用。

遗憾的是，简单的.sbt构建定义和Scala构建定义都不起作用。项目定义取自文档：

name := "sbt-test"

sourceGenerators in Compile += Def.task {
  val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
  IO.write(file, """object Test extends App { println("Hi") }""")
  Seq(file)
}

编译器在编译项目定义时会抱怨类型错误：

~/P/sbt-test ▶ sbt
[info] Loading global plugins from /Users/phearnot/.sbt/0.13/plugins
[info] Loading project definition from /Users/phearnot/Projects/sbt-test/project
/Users/phearnot/Projects/sbt-test/build.sbt:3: error: No implicit for Append.Value[Seq[sbt.Task[Seq[java.io.File]]], sbt.std.FullInstance.M[Seq[java.io.File]]] found,
  so sbt.std.FullInstance.M[Seq[java.io.File]] cannot be appended to Seq[sbt.Task[Seq[java.io.File]]]
sourceGenerators in Compile += Def.task {
                            ^
[error] Type error in expression
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

更新：现在AlexIv已经指出了我的SBT文件定义中的问题，我想知道将它移动到Scala构建定义的正确方法是什么？

Answer 1

将build.sbt中的Def.task（从gist）更改为Def.task[Seq[File]]，或者只是离开task[Seq[File]]因为Def会自动导入build.sbt：

name := "sbt-test"

sourceGenerators in Compile += task[Seq[File]] {
  val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
  IO.write(file, """object Test extends App { println("Hi") }""")
  Seq(file)
}

然后在sbt中调用compile。 Test.scala将生成./target/scala-2.10/src_managed/main/demo/Test.scala

Answer 2

使用<+=代替+=：

name := "sbt-test"

sourceGenerators in Compile <+= Def.task {
  val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
  IO.write(file, """object Test extends App { println("Hi") }""")
  Seq(file)
}

Answer 3

我的sbt版本是0.13.8，它适用于我。

没有隐含的Append.Value [...]与Def.task一起在SBT 0.13中生成文件？

3 个答案: