How to find out which files have changed using Sbt

Question

Sbt can re-run tasks when some of watched files have changed (~task). How to find out which files have changed?

In the command window it will tell you which files it is recompiling. Is that what you are looking for? Not certain what the purpose of your question is. — James Black, Nov 08 '12 at 17:40
i have input xml-files for integration testing and i need re-run tests on file-change (and only for changed files). — dk14, Nov 09 '12 at 11:31

score 3 · Accepted Answer · edited May 23 '17 at 10:34

You can add this to your build.sbt to see what files are watched:

watchSources ~= { files =>
  println(files.mkString("\n")+"\n\n\n")
  files//here you can add files or filter out
}

It might help you to test specific Test classes: ins sbt (interactice mode):

~test-only full.path.test.ClassName

To track file changes in general you can use Java 7 WatchService or Apache VFS for Java 6.

1 Answers1