在sbt項目的類路徑中添加tools.jar

Question

scala 2.9.1控制檯中的'：javap'命令需要'classpath'中的tools.jar（來自JDK6）。從cmd行可以使用'-cp'參數或CLASSPATH環境變量來完成。

如何爲使用'console'和'console-quick'命令從SBT調用的scala控制檯執行相同操作？

Answer 1

很長的答案，這可能會幫助你在別處。

如果我想知道在SBT的東西，我inspect它：

> inspect console 
[info] Task: Unit 
[info] Description: 
[info] Starts the Scala interpreter with the project classes on the classpath. 
[info] Provided by: 
[info] {file:/home/dcs/github/anti-xml/}default-39679a/compile:console 
[info] Dependencies: 
[info] compile:compilers(for console) 
[info] compile:full-classpath 
[info] compile:scalac-options(for console) 
[info] compile:initial-commands(for console) 
[info] compile:streams(for console) 
[info] Delegates: 
[info] compile:console 
[info] *:console 
[info] {.}/compile:console 
[info] {.}/*:console 
[info] */compile:console 
[info] */*:console 
[info] Related: 
[info] test:console 

好，有一個在compile:full-classpath一個有趣的依賴。我希望它是compile:full-classpath(for console)，但事實並非如此。不過，在這種情況下不應該引起麻煩。我們來inspect吧。

> inspect compile:full-classpath 
[info] Task: scala.collection.Seq[sbt.Attributed[java.io.File]] 
[info] Description: 
[info] The exported classpath, consisting of build products and unmanaged and managed, internal and external dependencies. 
[info] Provided by: 
[info] {file:/home/dcs/github/anti-xml/}default-39679a/compile:full-classpath 
[info] Dependencies: 
[info] compile:exported-products 
[info] compile:dependency-classpath 
[info] Reverse dependencies: 
[info] compile:console 
[info] Delegates: 
[info] compile:full-classpath 
[info] *:full-classpath 
[info] {.}/compile:full-classpath 
[info] {.}/*:full-classpath 
[info] */compile:full-classpath 
[info] */*:full-classpath 
[info] Related: 
[info] compile:full-classpath(for doc) 
[info] test:full-classpath 
[info] test:full-classpath(for doc) 
[info] *:full-classpath(for console) 
[info] runtime:full-classpath 
[info] compile:full-classpath(for console) 

好吧，我可以進一步進入依賴關係，但我不認爲這是必要的。讓我們看看裏面有什麼：

> show compile:full-classpath 
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist 
[info] List(Attributed(/home/dcs/github/anti-xml/target/scala-2.9.1/classes), Attributed(/home/dcs/.sbt/boot/scala-2.9.1/lib/scala-library.jar)) 
[success] Total time: 0 s, completed Dec 7, 2011 3:49:30 PM 

好吧，沒有什麼意外的。我們添加tools.jar。

要改變我必須使用set，我必須尊重一堆駱駝案件和其他規則才能使其工作。如果我有compile:full-classpath(for console)，那會變成fullClasspath in Compile in console。請注意0​​中的大寫字母，full-classpath變成fullClasspath，以及元素名稱的一般重新排序。 Details here。

我覺得一個人應該能夠採取的show輸出（或者，至少，inspect），並給它馬上回set，但並非如此（就目前而言），所以只是學習這些轉換規則。

我不想重新鍵入所有內容，只需添加一個JAR文件即可。我需要使用+=。用於改變事物的操作員可以找到here。

類路徑似乎需要一些Attributed東西。查看SBT維基上的Classpath的詳細文檔，並瞭解如何設計一個。幸運的是，我想要改變的大多數價值觀並不像這一個那樣難以創造。

> set fullClasspath in Compile += Attributed.blank(file("/usr/lib/jvm/java-6-sun-1.6.0.26/lib/tools.jar")) 
[info] Reapplying settings... 
[info] Set current project to anti-xml (in build file:/home/dcs/github/anti-xml/) 

似乎已經工作。讓我們show其內容確認，因爲即使寫compile而不是Compile可能會讓它改變錯誤的東西。

> show compile:full-classpath                    
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist 
[info] List(Attributed(/home/dcs/github/anti-xml/target/scala-2.9.1/classes), Attributed(/home/dcs/.sbt/boot/scala-2.9.1/lib/scala-library.jar), Attributed(/usr/lib/jvm/java-6-sun-1.6.0.26/lib/tools.jar)) 
[success] Total time: 0 s, completed Dec 7, 2011 3:50:07 PM 

是的，它是。讓我們來測試它：

> console 
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist 
[info] Starting scala interpreter... 
[info] 
import com.codecommit.antixml._ 
bookstore: com.codecommit.antixml.Elem = <bookstore><book><title>For Whom the Bell Tolls</title><author>Hemmingway</author></book><book><title>I, Robot</title><author>Isaac Asimov</author></book><book><title>Programming Scala</title><author>Dean Wampler</author><author>Alex Payne</author></book></bookstore> 
books: com.codecommit.antixml.Zipper[com.codecommit.antixml.Elem] = <book><title>For Whom the Bell Tolls</title><author>Hemmingway</author></book><book><title>I, Robot</title><author>Isaac Asimov</author></book><book><title>Programming Scala</title><author>Dean Wampler</author><author>Alex Payne</author></book> 
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26). 
Type in expressions to have them evaluated. 
Type :help for more information. 

scala> :javap com.codecommit.antixml.Elem 
Compiled from "node.scala" 
public class com.codecommit.antixml.Elem extends java.lang.Object implements com.codecommit.antixml.Node,com.codecommit.antixml.Selectable,scala.ScalaObject,scala.Product,scala.Serializable{ 
    public static final scala.Function1 tupled(); 
    public static final scala.Function1 curry(); 
    public static final scala.Function1 curried(); 
    public static final boolean isValidName(java.lang.String); 
    public scala.collection.Iterator productIterator(); 
    public scala.collection.Iterator productElements(); 
    public java.lang.Object $bslash(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper); 
    public java.lang.Object $bslash$bslash(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper); 
    public java.lang.Object $bslash$bslash$bang(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper); 
    public java.lang.Object select(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper); 
    public com.codecommit.antixml.Zipper toZipper(); 
    public scala.Option prefix(); 
    public java.lang.String name(); 
    public com.codecommit.antixml.Attributes attrs(); 
    public scala.collection.immutable.Map scope(); 
    public com.codecommit.antixml.Group children(); 
    public com.codecommit.antixml.Elem canonicalize(); 
    public java.lang.String toString(); 
    public com.codecommit.antixml.Group toGroup(); 
    public com.codecommit.antixml.Group copy$default$5(); 
    public scala.collection.immutable.Map copy$default$4(); 
    public com.codecommit.antixml.Attributes copy$default$3(); 
    public java.lang.String copy$default$2(); 
    public scala.Option copy$default$1(); 
    public com.codecommit.antixml.Elem copy(scala.Option, java.lang.String, com.codecommit.antixml.Attributes, scala.collection.immutable.Map, com.codecommit.antixml.Group); 
    public int hashCode(); 
    public boolean equals(java.lang.Object); 
    public java.lang.String productPrefix(); 
    public int productArity(); 
    public java.lang.Object productElement(int); 
    public boolean canEqual(java.lang.Object); 
    public com.codecommit.antixml.Elem(scala.Option, java.lang.String, com.codecommit.antixml.Attributes, scala.collection.immutable.Map, com.codecommit.antixml.Group); 
} 

成功!!!

當然，這次會議是謊言。我到達那裏需要更長的時間，但這主要是練習。

Answer 2

https://github.com/ensime/ensime-server/blob/master/build.sbt#L35

// epic hack to get the tools.jar JDK dependency 
val JavaTools = List[Option[String]] (
    // manual 
    sys.env.get("JDK_HOME"), 
    sys.env.get("JAVA_HOME"), 
    // osx 
    try Some("/usr/libexec/java_home".!!.trim) 
    catch { 
    case _: Throwable => None 
    }, 
    // fallback 
    sys.props.get("java.home").map(new File(_).getParent), 
    sys.props.get("java.home") 
).flatten.map { n => 
    new File(n + "/lib/tools.jar") 
}.find(_.exists).getOrElse (
    throw new FileNotFoundException (
    """Could not automatically find the JDK/lib/tools.jar. 
     |You must explicitly set JDK_HOME or JAVA_HOME.""".stripMargin 
) 
)