我正在阅读SBT Getting Started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++=也不起作用。）
我在<base-dir>/other和<base-dir>/src/main/scala中有源文件。我运行了sbt并输入了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)
Foo对象在other源目录的foo.scala中定义。
我错过了什么？
答案 0 :(得分：7)
tl; dr The answer by @schleichardt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任务的依赖关系。使用inspect tree compile查找它们。
[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。该任务又取决于使用compile:unmanagedSources设置的compile:unmanagedSourceDirectories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]
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
设置属于scala.collection.Seq[java.io.File]类型，要将元素附加到seq，您可以使用+=方法。
话虽如此，build.sbt文件应如下所示：
unmanagedSourceDirectories in Compile += (baseDirectory / "other").value
您不必使用baseDirectory设置，但它会使基本目录显式。
答案 1 :(得分：2)
你可以试试这个：
unmanagedSourceDirectories in Compile += file("other")