如何在构建时获取SBT登台目录?

时间:2014-05-29 12:04:27

标签: scala sbt

如何在构建时获取SBT登台目录?

我想做一个棘手的克隆远程回购,而SBT的stagingDirectory似乎很合适。

如何获取“Build.scala”中的目录?

SBT源代码: http://www.scala-sbt.org/0.13.1/sxr/sbt/BuildPaths.scala.html#sbt.BuildPaths.stagingDirectory

=======

与问题无直接关系的潜在问题。我想在SBT中使用git依赖的子目录。 SBT没有开箱即用,所以我写了一个简单的包装器:

object Git {

  def clone(cloneFrom: String, branch: String, subdirectory: String) = {
    val uniqueHash = Hash.halfHashString(cloneFrom + branch)
    val cloneTo = file(sys.props("user.home")) / ".sbt" / "staging" / uniqueHash

    val clonedDir = creates(cloneTo) {
      Resolvers.run("git", "clone", cloneFrom, cloneTo.absolutePath)
      Resolvers.run(Some(cloneTo), "git", "checkout", "-q", branch)
    }

    clonedDir / subdirectory
  }
}

用法:

lazy val myDependency = Git.clone(cloneFrom = "git://...someproject.git", branch = "v2.4", subdirectory = "someModule")

1 个答案:

答案 0 :(得分:2)

查看链接中的API,您可以使用两种方法getGlobalBasegetStagingDirectory,这两种方法都采用状态。

import sbt._
import Keys._
import sbt.BuildPaths._

object MyBuild extends Build {

  val outputStaging = taskKey[Unit]("Outputs staging")

  lazy val root = project.in(file(".")).settings(
    outputStaging := {
      val s = state.value
      println(getStagingDirectory(s, getGlobalBase(s)))

    }
  )

}

修改

在您上次发表评论后,我认为您正在寻找custom resolver。自定义解析程序可以访问ResolveInfo对象,该对象具有名为staging的属性。

例如,这就是您如何实现所需目标(实际上无法直接访问staging):

object MyBuild extends Build {

  lazy val root = project.in(file(".")).dependsOn(RootProject(uri("dir+git://github.com/lpiepiora/test-repo.git#branch=master&dir=subdir")))

  override def buildLoaders = BuildLoader.resolve(myCustomGitResolver) +: super.buildLoaders

  def myCustomGitResolver(info: BuildLoader.ResolveInfo): Option[() => File] =
    if(info.uri.getScheme != "dir+git") None
    else {
      import RichURI.fromURI
      val uri = info.uri
      val (branch, directory) = parseOutBranchNameAndDir(uri.getFragment)
      val gitResolveInfo = new BuildLoader.ResolveInfo(
        uri.copy(scheme = "git", fragment = branch), info.staging, info.config, info.state
      )
      println(uri.copy(scheme = "git", fragment = branch))
      Resolvers.git(gitResolveInfo).map(fn => () => fn() / directory)
    }

  // just an ugly way to get the branch and the folder
  // you may want something more sophisticated
  private def parseOutBranchNameAndDir(fragment: String): (String, String) = {
    val Array(branch, dir) = fragment.split('&')
    (branch.split('=')(1), dir.split('=')(1))
  }

}

我们的想法是委托给预定义的git解析器,我们让它完成它的工作,完成之后,我们将返回一个子目录:fn() / directory

这是一个例子,当然你可以坚持你获取存储库的逻辑。您可以在解析程序方法中使用登台目录