如何设置 IntelliJ Idea Scala 项目来识别本地 Ivy2 缓存？

您可能知道，新版本的 SBT（0.11）旨在维护公共库缓存~/.ivy2/cache而不是复制项目目录中的完整依赖项集。但是 IntelliJ Idea（我使用 SBT 插件生成 Idea 项目）默认似乎忽略了公共缓存，只看到放在项目目录下的库（因此，我必须配置 SBT 来执行这种传统方式）。如何解决这个问题？

Idea插件存储库中有一些ivy插件，但我不知道其中哪些（如果有的话）可以解决问题（请注意，我不希望它管理依赖项并下载库（因为它已完成）通过 SBT）但只是在缓存中查找类）。

sbt-idea 指的是以下位置的库：sbt引用它们，默认情况下位于~/.ivy2/cache.

这是它在我的系统上的样子，有一个新项目 SBT 0.11.2 和 sbt-idea 0.11.0：

 ~/code/scratch/20120225 sbt
[info] Loading global plugins from /Users/jason/.sbt/plugins
[info] Set current project to default-d73535 (in build file:/Users/jason/code/scratch/20120225/)

> set libraryDependencies += "org.scalaz" %% "scalaz-core" % "6.0.3"
[info] Reapplying settings...
[info] Set current project to default-d73535 (in build file:/Users/jason/code/scratch/20120225/)

> session save
[info] Reapplying settings...
[info] Set current project to default-d73535 (in build file:/Users/jason/code/scratch/20120225/)

> gen-idea no-sbt-classifiers
[info] Trying to create an Idea module default-d73535
[info] Resolving org.scala-lang#scala-library;2.9.1 ...
[info] Resolving org.scalaz#scalaz-core_2.9.1;6.0.3 ...
[info] Excluding folder target
[info] Created /Users/jason/code/scratch/20120225/.idea/IdeaProject.iml
[info] Created /Users/jason/code/scratch/20120225/.idea
[info] Excluding folder /Users/jason/code/scratch/20120225/target
[info] Created /Users/jason/code/scratch/20120225/.idea_modules/default-d73535.iml
[info] Created /Users/jason/code/scratch/20120225/.idea_modules/project.iml

  ~/code/scratch/20120225 grep jar /Users/jason/code/scratch/20120225/.idea/libraries/*.xml
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-library.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-lang/scala-library/docs/scala-library-2.9.1-javadoc.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-lang/scala-library/srcs/scala-library-2.9.1-sources.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$USER_HOME$/.ivy2/cache/org.scalaz/scalaz-core_2.9.1/jars/scalaz-core_2.9.1-6.0.3.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$USER_HOME$/.ivy2/cache/org.scalaz/scalaz-core_2.9.1/docs/scalaz-core_2.9.1-6.0.3-javadoc.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$USER_HOME$/.ivy2/cache/org.scalaz/scalaz-core_2.9.1/srcs/scalaz-core_2.9.1-6.0.3-sources.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/scala_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-library.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/scala_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-compiler.jar!/"></root>

然而，SBT 有一个配置设置，retrieve-managed使用所有库的构建本地副本，而不是直接从缓存引用它们。如果您启用了此功能，sbt-idea还将设置 IntelliJ 类路径来引用这些。

这是帮助：

> help retrieve-managed

If true, enables retrieving dependencies to the current build.  Otherwise, dependencies are used directly from the cache.

让我们尝试一下：

> set retrieveManaged in ThisBuild := true  
[info] Reapplying settings...
[info] Set current project to default-d73535 (in build file:/Users/jason/code/scratch/20120225/)
> update
[info] Updating {file:/Users/jason/code/scratch/20120225/}default-d73535...
[info] Resolving org.scala-lang#scala-library;2.9.1 ...
[info] Resolving org.scalaz#scalaz-core_2.9.1;6.0.3 ...
[info] Done updating.
[success] Total time: 1 s, completed Feb 25, 2012 9:07:41 AM
> show compile:dependency-classpath
[info] Updating {file:/Users/jason/code/scratch/20120225/}default-d73535...
[info] Resolving org.scala-lang#scala-library;2.9.1 ...
[info] Resolving org.scalaz#scalaz-core_2.9.1;6.0.3 ...
[info] Done updating.
[info] ArrayBuffer(Attributed(/Users/jason/.sbt/boot/scala-2.9.1/lib/scala-library.jar), Attributed(/Users/jason/code/scratch/20120225/lib_managed/jars/org.scalaz/scalaz-core_2.9.1/scalaz-core_2.9.1-6.0.3.jar))
[success] Total time: 0 s, completed Feb 25, 2012 9:07:54 AM


> gen-idea no-sbt-classifiers
[info] Trying to create an Idea module default-d73535
[info] Resolving org.scala-lang#scala-library;2.9.1 ...
[info] Resolving org.scalaz#scalaz-core_2.9.1;6.0.3 ...
[info] Excluding folder target
[info] Created /Users/jason/code/scratch/20120225/.idea/IdeaProject.iml
[info] Created /Users/jason/code/scratch/20120225/.idea
[info] Excluding folder /Users/jason/code/scratch/20120225/target
[info] Created /Users/jason/code/scratch/20120225/.idea_modules/default-d73535.iml
[info] Created /Users/jason/code/scratch/20120225/.idea_modules/project.iml

 ~/code/scratch/20120225 grep jar /Users/jason/code/scratch/20120225/.idea/libraries/*.xml
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-library.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$PROJECT_DIR$/lib_managed/docs/org.scala-lang/scala-library/scala-library-2.9.1-javadoc.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scala_lang_scala_library_2_9_1.xml:      <root url="jar://$PROJECT_DIR$/lib_managed/srcs/org.scala-lang/scala-library/scala-library-2.9.1-sources.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$PROJECT_DIR$/lib_managed/jars/org.scalaz/scalaz-core_2.9.1/scalaz-core_2.9.1-6.0.3.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$PROJECT_DIR$/lib_managed/docs/org.scalaz/scalaz-core_2.9.1/scalaz-core_2.9.1-6.0.3-javadoc.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/org_scalaz_scalaz_core_2_9_1_6_0_3.xml:      <root url="jar://$PROJECT_DIR$/lib_managed/srcs/org.scalaz/scalaz-core_2.9.1/scalaz-core_2.9.1-6.0.3-sources.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/scala_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-library.jar!/"></root>
/Users/jason/code/scratch/20120225/.idea/libraries/scala_2_9_1.xml:      <root url="jar://$USER_HOME$/.sbt/boot/scala-2.9.1/lib/scala-compiler.jar!/"></root>