在 Scala REPL 中导入多个包 [英] Import multiple packages in Scala REPL

问题描述

在 Scala 中，我经常需要导入多个包含隐式和其他实用程序的包，尤其是在 REPL 上:

In Scala, I frequently have to import multiple packages worth of implicits and other utilities, particularly on the REPL:

import scala.collection.JavaConversions._
import scala.collection.{mutable => mut}
import com.myapp.db._
import com.orm._
val con = connectDb(...)
...

我知道无法在 Scala 中导入多个包(尽管包对象范围可以提供一些帮助)，但是从 REPL 中呢?有没有办法从 REPL 中做到这一点而无需大量复制和粘贴?我也尝试使用 :load，但在那里导入/创建的东西也没有被引入 REPL 的范围.我注意到 :power 命令确实将内容导入范围.

I understand there's no way to import multiple packages in Scala (though package object scopes can help a bit), but what about from the REPL? Is there any way to do this from the REPL without lots of copying and pasting? I also tried using :load, but things imported/created there don't get introduced into the REPL's scope either. I noticed that the :power command does import things into scope.

更新::load 实际上确实有效.

推荐答案

我不确定通用的解决方案，但在 SBT 中可以配置项目，以便控制台 (REPL) 在启动时运行一些初始命令.这是示例build.sbt文件的摘录，>

I'm not sure of a general solution, but in SBT it's possible to configure the project so that the console (REPL) runs some initial commands upon launching. Here's an excerpt from an example build.sbt file,

// set the initial commands when entering 'console' only
initialCommands in console := "import myproject._"

编辑:另一个参考是 Scalala 项目.他们有一个 Scala 程序，可以启动嵌入式 REPL 并填充在必要的进口.有关用法，请参阅他们的快速入门指南.

Edit: Another reference is the Scalala project. They have a Scala program that launches an embedded REPL and fills in the necessary imports. For usage, see their quick-start guide.

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