从sbt中的依赖项获取资源文件

Question

我有一个带有一些webjar和常见jar依赖项的sbt-web项目.我想从我的一个jar依赖项中获取资源文件,并在连接任务中使用它.但是我不知道如何在build.sbt中引用依赖jar中的资源.

Answer 1

我终于找到了这个文档的解决方案.主要思想是在类路径依赖项中找到正确的jar,将其解压缩到temprorary文件夹,并使用此文件执行所需操作.在我的情况下,我将其复制到我的目标目录并在连接任务中使用它.

我最终得到这个代码:

def copyResourceFromJar(classpathEntry: Attributed[File], jarName: String, resourceName: String) = {
  classpathEntry.get(artifact.key) match {
    case Some(entryArtifact) => {
      // searching artifact
      if (entryArtifact.name.startsWith(jarName)) {
        // unpack artifact's jar to tmp directory
        val jarFile = classpathEntry.data
        IO.withTemporaryDirectory { tmpDir =>
          IO.unzip(jarFile, tmpDir)
          // copy to project's target directory
          // Instead of copying you can do any other stuff here 
          IO.copyFile(
            tmpDir / resourceName,
            (WebKeys.webJarsDirectory in Assets).value / resourceName
          )
        }
      }
    }
    case _ =>
  }
}
for(entry <- (dependencyClasspath in Compile).value) yield {
  copyResourceFromJar(entry, "firstJar", "firstFile.js")
  copyResourceFromJar(entry, "secondJar", "some/path/secondFile.js")
}

此代码应放在任务中.例如:

val copyResourcesFromJar = TaskKey[Unit]("copyResourcesFromJar", "Copy resources from jar dependencies")
copyResourcesFromJar := {
  //your task code here
}
copyResourcesFromJar <<= copyResourcesFromJar dependsOn (dependencyClasspath in Compile)

并且不要忘记将此任务添加为构建任务的依赖性.就我而言,它看起来像这样:

concat <<= concat dependsOn copyResourcesFromJar