问题
I believe my source code files feature many imports that are not used in the code (as I have a bad habit of copying them from existing to new files). When coding C# in Visual Studio (or, maybe, it's a feature of an add-on of it) one can wipe out all the unused imports in just a click. Is there an analogous tool for Scala? Would be cool if I could just point it to my sources directory and it would clean all the files inside it and all its subdirs and subdirs of them (etc).
回答1:
IntelliJ can automatically clean up imports, not just highlight them, and for the whole directory. The shortcut is Ctrl + Alt + O.
回答2:
I think Intellij marks unused imports gray. I don't think there is an automatic tool yet. Eclipse's and ensime's "organize imports" refactoring doesn't remove imports. You could of course always comment out individual imports and recompile.
回答3:
Scalafix has a rewrite to remove unused imports: https://scalacenter.github.io/scalafix/#RemoveUnusedImports
add addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.5.0-M1") to your project/plugins.sbt
then run sbt "scalafix RemoveUnusedImports"
来源：https://stackoverflow.com/questions/7767567/is-there-a-tool-for-scala-to-clean-all-the-unused-imports-from-all-the-code-file