Scala REPL在Gradle中 [英] Scala REPL in Gradle

问题描述

Gradle的scala集成不提供REPL功能。如何使用适当的类路径从Gradle运行Scala REPL？

解决方案

最小 build.gradle ：

  apply plugin：'scala'
 
 repositories {
 mavenCentral（）
} 
 
依赖项{
 compileorg.scala-lang：scala-library：2.11.7
 compileorg.scala-lang ：scala-compiler：2.11.7

 
任务repl（类型：JavaExec）{
 main =scala.tools.nsc.MainGenericRunner
 classpath = sourceSets.main.runtimeClasspath 
 standardInput System.in 
 args'-usejavacp'
} 
  

感谢这个回答，解释如何使用standardInput引导stdin，并让REPL使用正确的类路径带有参数。

请注意， scala-compiler 库是一个依赖项。这就是找到 scala.tools.nsc.MainGenericRunner 的地方。

在控制台中需要多个选项运行REPL：

• - no-daemon ，如果你正在使用Gradle守护进程。目前，如果从守护进程运行，REPL不响应击键。




• - console plain 。一个流行的，但低级的替代方案是 - 安静。如果没有这些选项之一运行，REPL的提示就会被Gradle的进度报告所污染。 - console plain 具有调整readline行为的好处，因此 rlwrap 是不必要的。

运行REPL的完整命令是 gradle repl --console plain --no-daemon ，所以在shell中创建一个别名是有道理的。

At the moment Gradle's scala integration does not offer REPL functionality. How to ergonomically run a Scala REPL from Gradle with the appropriate classpath?

解决方案

Minimal build.gradle:

apply plugin: 'scala'

repositories{
  mavenCentral()
}

dependencies{
  compile "org.scala-lang:scala-library:2.11.7"
  compile "org.scala-lang:scala-compiler:2.11.7"
}

task repl(type:JavaExec) {
  main = "scala.tools.nsc.MainGenericRunner"
  classpath = sourceSets.main.runtimeClasspath
  standardInput System.in
  args '-usejavacp'
}

Credit to this answer for explaining how to direct stdin with standardInput and have REPL use the right classpath with args.

Notice the scala-compiler library is a dependency. That's where scala.tools.nsc.MainGenericRunner is found.

From the console a number of options are needed to run the REPL:

• --no-daemon, if you are using a Gradle daemon. At the moment, the REPL does not respond to keystrokes if run from the daemon.

• --console plain. A popular, but inferior alternative is --quiet. If run without one of these options, REPL's prompt is contaminated by Gradle's progress report. --console plain has the advantage that it also adjusts readline's behaviour so that rlwrap is unnecessary.

Full command to run the REPL is gradle repl --console plain --no-daemon, so creating an alias in your shell makes sense.

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