scala - 如何检查 Seq[Setting[_]] 中的设置值？

Question

我正在尝试读取SbtTwirltwirlSettings中定义的值。

有没有办法做到这一点？也许使用sbt inspect？或者还有其他方法吗？当我试图找出为什么我的 Twirl 模板没有被编译时，我需要阅读这些值。

Answer 1

twirlSettings，因此，不是您可以使用的密钥sbt inspect。它是一个Seq[Setting[_]]. 但是，您可以检查它产生的各个设置。例如：

> inspect compile:compileTemplates::sourceDirectories

检查第 40 行产生的内容：

sourceDirectories in compileTemplates := Seq(sourceDirectory.value / "twirl"),

Answer 2

另一个答案很好，但是使用consoleProjector的方法更复杂一些eval。

请参阅以下会话consoleProject：

[root]> help consoleProject
Starts the Scala interpreter with the sbt and the build definition on the classpath and useful imports.

[root]> consoleProject
[info] Starting scala interpreter...
[info]
import sbt._
import Keys._
import _root_.com.typesafe.sbteclipse.plugin.EclipsePlugin._
import _root_.gilt.DependencyGraph._
import _root_.net.virtualvoid.sbt.graph.Plugin._
import _root_.com.typesafe.sbt.SbtGit._
import _root_.com.github.tototoshi.sbt.musical.Plugin._
import _root_.com.timushev.sbt.updates.UpdatesPlugin._
import _root_.play.twirl.sbt.SbtTwirl.autoImport._
import _root_.sbt.plugins.IvyPlugin
import _root_.sbt.plugins.JvmPlugin
import _root_.sbt.plugins.CorePlugin
import _root_.sbt.plugins.JUnitXmlReportPlugin
import _root_.play.twirl.sbt.SbtTwirl
import currentState._
import extracted._
import cpHelpers._
Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_25).
Type in expressions to have them evaluated.
Type :help for more information.

scala> SbtTwirl
res0: play.twirl.sbt.SbtTwirl.type = play.twirl.sbt.SbtTwirl

访问SbtTwirl和使用 Scala 你可以做任何你想做的事，但要小心你的猜测，因为生活consoleProject可能并不像现在那么容易build.sbt——没有.value宏在你的指尖。不过，您在 Scala 世界中。

scala> SbtTwirl.twirlSettings.foreach { s => println(s) }
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),includeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,38)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),excludeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,39)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,40)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,42)
setting(ScopedKey(Scope(This,Global,This,This),watchSources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,48)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),target)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,50)
setting(ScopedKey(Scope(This,This,This,This),twirlCompileTemplates)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,52)
setting(ScopedKey(Scope(This,This,This,This),sourceGenerators)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,54)
setting(ScopedKey(Scope(This,This,This,This),managedSourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,55)

使用eval也可能有用。

[root]> help eval
eval <expression>

    Evaluates the given Scala expression and prints the result and type.

[root]> eval SbtTwirl.twirlSettings
[info] ans: Seq[sbt.Setting[_]] = List(setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),includeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,38), setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),excludeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,39), setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,40), setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,42), setting(ScopedKey(Scope(This,Global,This,This),watchSources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,48), setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),target)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,50), setting(ScopedKey(Scope(This,This,This,This),twirlCompileTemplates)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,52), setting(ScopedKey(Scope(This,This,This,This),sourceGenerators)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,54), setting(ScopedKey(Scope(This,This,This,This),managedSourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,55))

[root]> eval SbtTwirl.twirlSettings.foreach { e => println(e) }
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),includeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,38)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),excludeFilter)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,39)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,40)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),sources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,42)
setting(ScopedKey(Scope(This,Global,This,This),watchSources)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,48)
setting(ScopedKey(Scope(This,This,Select(twirlCompileTemplates),This),target)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,50)
setting(ScopedKey(Scope(This,This,This,This),twirlCompileTemplates)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,52)
setting(ScopedKey(Scope(This,This,This,This),sourceGenerators)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,54)
setting(ScopedKey(Scope(This,This,This,This),managedSourceDirectories)) at LinePosition((play.twirl.sbt.SbtTwirl) SbtTwirl.scala,55)
[info] ans: Unit = null