将系统属性传递给"sbt控制台"? [英] Pass System Property to `sbt console`?

问题描述

从此有用的 answer 借用，我尝试将-Dfoo=bar传递给sbt console.

Borrowing from this helpful answer, I tried to pass -Dfoo=bar to sbt console.

给出一个仅具有build.sbt的SBT项目:

Given an SBT project having only a build.sbt:

$cat build.sbt
scalaVersion := "2.11.8"

fork := true

我尝试过:

$sbt '; set javaOptions += "-Dfoo=bar" ; console'

scala> sys.props.get("foo")
res0: Option[String] = None

但是，我给定了set ...参数，我期望的是Some("bar")而不是None.

but, I had expected Some("bar") rather than None given the set ... argument.

但是，使用sbt ... run可以按预期工作:

However, using sbt ... run worked as expected:

$cat src/main/scala/net/Main.scala 
package net

object Main {
       def main(args: Array[String]): Unit = 
           println("sys.props.get('foo'): " + sys.props.get("foo"))
}

$sbt '; set javaOptions += "-Dfoo=bar" ; run'
[info] Running net.Main 
[info] sys.props.get('foo'): Some(bar)

如何将foo=bar作为系统属性传递给console?

How can I pass foo=bar as a System Property to the console?

推荐答案

run分叉，但console不分叉，因此简单地sbt -Dfoo=bar console

run forks but console doesn't, so simply sbt -Dfoo=bar console

如果需要，您可以设置它:

If need be you can set it:

• 在sbt shell中与eval sys.props("foo") = "bar"
• 在REPL(console)中与sys.props("foo") = "bar"
在build.sbt中与val setFoo = sys.props("foo") = "bar"

• in the sbt shell with eval sys.props("foo") = "bar"
• in the REPL (console) with sys.props("foo") = "bar"
• in build.sbt with val setFoo = sys.props("foo") = "bar"

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