scala - scala 如何支持这种 sbt DSL 语法？

Question

我正在浏览sbt manual我发现您可以设置项目并从 val 的名称推断位置。

lazy val util =(文件中的项目(“util”))相当于lazy val util = 项目这怎么可能？

Answer 1

macro

/**
 * Creates a new Project.  This is a macro that expects to be assigned directly to a val.
 * The name of the val is used as the project ID and the name of the base directory of the project.
 */
def project: Project = macro Project.projectMacroImpl

展开

lazy val util = project

至

Project.apply("util", new File("util"))

查看 sbt 宏扩展哪些内容来创建 project/build.sbt 文件

scalacOptions ++= Seq("-Ymacro-debug-lite")