为什么我的sourceDirectories设置在sbt中没有效果？

Question

我正在阅读SBT 入门指南.该页面以sourceDirectories设置为例.为了自己尝试,我将以下内容放在我的build.sbt文件中,用于基本的"hello world"项目.

sourceDirectories in Compile := Seq(file("other"))

(附加+=或++=不起作用.)

我在源文件<base-dir>/other和<base-dir>/src/main/scala.我跑了sbt并打字compile.它忽略了设置:

> compile
[info] Compiling 1 Scala source to /Learning/Scala/proj1/target/scala-2.9.2/classes...
[error] /Learning/Scala/proj1/src/main/scala/hello.scala:7: not found: value Foo
[error]     println(Foo.foo)

该Foo对象在other源目录中的foo.scala中定义.

我错过了什么？

Answer 1

tl; dr @schleichardt的答案是有效的 - 您需要将以下内容添加到build.sbt文件中:

unmanagedSourceDirectories in Compile += file("other")

解释归结为检查compile任务的依赖性.使用inspect tree compile到它们找出来.

[proj1]> inspect tree compile
[info] compile:compile = Task[sbt.inc.Analysis]
[info]   +-compile:compile::compileInputs = Task[sbt.Compiler$Inputs]
[info]   | +-compile:scalacOptions = Task[scala.collection.Seq[java.lang.String]]
[info]   | +-compile:sources = Task[scala.collection.Seq[java.io.File]]
[info]   | +-*/*:sourcePositionMappers = Task[scala.collection.Seq[scala.Function1[xsbti.Position, scala.Option[xsbti.Position]]]]
[info]   | +-*/*:maxErrors = 100
[info]   | +-*:compilers = Task[sbt.Compiler$Compilers]
[info]   | +-compile:compile::streams = Task[sbt.std.TaskStreams[sbt.Init$ScopedKey[_ <: Any]]]
[info]   | | +-*/*:streamsManager = Task[sbt.std.Streams[sbt.Init$ScopedKey[_ <: Any]]]
[info]   | |
[info]   | +-compile:incCompileSetup = Task[sbt.Compiler$IncSetup]
[info]   | +-*/*:compileOrder = Mixed
[info]   | +-compile:dependencyClasspath = Task[scala.collection.Seq[sbt.Attributed[java.io.File]]]
[info]   | +-compile:classDirectory = target/scala-2.10/classes
[info]   | +-*/*:javacOptions = Task[scala.collection.Seq[java.lang.String]]
[info]   |
[info]   +-compile:compile::streams = Task[sbt.std.TaskStreams[sbt.Init$ScopedKey[_ <: Any]]]
[info]     +-*/*:streamsManager = Task[sbt.std.Streams[sbt.Init$ScopedKey[_ <: Any]]]
[info]

如您所见,任务取决于compile:sources任务.该任务又取决于compile:unmanagedSources使用该compile:unmanagedSourceDirectories设置的任务.

[proj1]> inspect tree compile:sources
[info] compile:sources = Task[scala.collection.Seq[java.io.File]]
[info]   +-compile:unmanagedSources = Task[scala.collection.Seq[java.io.File]]
[info]   | +-compile:unmanagedSourceDirectories = List(/Users/jacek/sandbox/stackoverflow/proj1/src/main/scala, /Users/jacek/sandbox/stackoverflow/proj1/src/main/java, /Users/..
[info]   | | +-compile:javaSource = src/main/java
[info]   | | | +-compile:sourceDirectory = src/main
[info]   | | |   +-*:sourceDirectory = src
[info]   | | |   | +-*:baseDirectory = /Users/jacek/sandbox/stackoverflow/proj1
[info]   | | |   |   +-*:thisProject = Project(id: proj1, base: /Users/jacek/sandbox/stackoverflow/proj1, aggregate: List(), dependencies: List(), configurations: List(compile..
[info]   | | |   |
[info]   | | |   +-compile:configuration = compile
[info]   | | |
[info]   | | +-compile:scalaSource = src/main/scala
[info]   | | | +-compile:sourceDirectory = src/main
[info]   | | |   +-*:sourceDirectory = src
[info]   | | |   | +-*:baseDirectory = /Users/jacek/sandbox/stackoverflow/proj1
[info]   | | |   |   +-*:thisProject = Project(id: proj1, base: /Users/jacek/sandbox/stackoverflow/proj1, aggregate: List(), dependencies: List(), configurations: List(compile..
[info]   | | |   |
[info]   | | |   +-compile:configuration = compile
[info]   | | |
[info]   | | +-*:baseDirectory = /Users/jacek/sandbox/stackoverflow/proj1
[info]   | |   +-*:thisProject = Project(id: proj1, base: /Users/jacek/sandbox/stackoverflow/proj1, aggregate: List(), dependencies: List(), configurations: List(compile, runt..
[info]   | |
[info]   | +-*/*:excludeFilter = sbt.SimpleFileFilter@7ced8ea7
[info]   | +-*:baseDirectory = /Users/jacek/sandbox/stackoverflow/proj1
[info]   | +-*/*:unmanagedSources::includeFilter = sbt.SimpleFilter@1beb6bba
[info]   | +-*/*:sourcesInBase = true
[info]   |
[info]   +-compile:managedSources = Task[scala.collection.Seq[java.io.File]]
[info]     +-compile:sourceGenerators = List()
[info]

该compile:unmanagedSourceDirectories设置引用"非托管源目录,其中包含手动创建的源".

[proj1]> inspect compile:unmanagedSourceDirectories
[info] Setting: scala.collection.Seq[java.io.File] = List(/Users/jacek/sandbox/stackoverflow/proj1/src/main/scala, /Users/jacek/sandbox/stackoverflow/proj1/src/main/java, /Users/jacek/sandbox/stackoverflow/proj1/other)
[info] Description:
[info]  Unmanaged source directories, which contain manually created sources.
[info] Provided by:
[info]  {file:/Users/jacek/sandbox/stackoverflow/proj1/}proj1/compile:unmanagedSourceDirectories
[info] Defined at:
[info]  (sbt.Defaults) Defaults.scala:161
[info]  /Users/jacek/sandbox/stackoverflow/proj1/build.sbt:1
[info] Dependencies:
[info]  compile:javaSource
[info]  compile:scalaSource
[info]  *:baseDirectory
[info] Reverse dependencies:
[info]  compile:unmanagedSources
[info]  compile:sourceDirectories
[info] Delegates:
[info]  compile:unmanagedSourceDirectories
[info]  *:unmanagedSourceDirectories
[info]  {.}/compile:unmanagedSourceDirectories
[info]  {.}/*:unmanagedSourceDirectories
[info]  */compile:unmanagedSourceDirectories
[info]  */*:unmanagedSourceDirectories
[info] Related:
[info]  test:unmanagedSourceDirectories

设置是scala.collection.Seq[java.io.File]类型,并将元素附加到seq,您可以使用+=方法.

话虽如此,该build.sbt文件应如下:

unmanagedSourceDirectories in Compile += (baseDirectory / "other").value

您不必使用该baseDirectory设置,但它使基本目录显式.