build.sbt 和 build.scala 有什么区别? [英] What is the difference between build.sbt and build.scala?

问题描述

我开始学习 Scala，几乎在每个教程中我都会看到一个描述项目设置的 build.sbt 文件.但是现在我已经安装了 giter8 并从模板创建了一个项目.并且从模板生成的项目缺少 build.sbt 文件，但它有 build.scala (似乎用于相同的目的，但它更灵活).

I started to learn Scala and almost in every tutorial I see a build.sbt file which describes project settings. But now I have installed giter8 and created a project from template. And generated project from template missed build.sbt file, but it have build.scala (which seems used for same purposes, but it is more flexible).

那么 build.sbt 和 build.scala 有什么区别?
哪个更受欢迎，为什么?

So what is the difference between build.sbt and build.scala?
Which is more preferred and why?

推荐答案

举个简单的例子，这个build.sbt:

To give a brief example, this build.sbt:

name := "hello"

version := "1.0"

是一个大致相当于这个 project/Build.scala 的速记符号:

is a shorthand notation roughly equivalent to this project/Build.scala:

import sbt._
import Keys._

object Build extends Build {
  lazy val root = Project(id = "root", base = file(".")).settings(
    name := "hello",
    version := "1.0"      
  )
}

.sbt 文件还可以包含 vals、lazy vals 和 defs(但不是 objects 和 classes).

The .sbt file can also include vals, lazy vals, and defs (but not objects and classes).

请参阅名为.scala 构建定义"的 SBT 文档，特别是该部分将 build.sbt 与 Build.scala 相关联".

See the SBT document called ".scala build definition", particularly the section "Relating build.sbt to Build.scala".

如果您正在做一些需要 Scala 完整表现力的复杂事情，请考虑使用 .scala 构建定义.

Consider a .scala build definition if you're doing something complicated where you want the full expressiveness of Scala.

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