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logLevel := Level.Debug
incOptions := incOptions.value.withNameHashing(true)
// disable sbt's heauristic which recompiles everything in case
// some fraction (e.g. 50%) of files is scheduled to be recompiled
// in this test we want precise information about recompiled files
// which that heuristic would distort
incOptions := incOptions.value.copy(recompileAllFraction = 1.0)
/* Performs checks related to compilations:
* a) checks in which compilation given set of files was recompiled
* b) checks overall number of compilations performed
*/
TaskKey[Unit]("check-compilations") := {
val analysis = (compile in Compile).value
val srcDir = (scalaSource in Compile).value
def relative(f: java.io.File): java.io.File = f.relativeTo(srcDir) getOrElse f
val allCompilations = analysis.compilations.allCompilations
val recompiledFiles: Seq[Set[java.io.File]] = allCompilations map { c =>
val recompiledFiles = analysis.apis.internal.collect {
case (file, api) if api.compilation.startTime == c.startTime => relative(file)
}
recompiledFiles.toSet
}
def recompiledFilesInIteration(iteration: Int, fileNames: Set[String]) = {
val files = fileNames.map(new java.io.File(_))
assert(recompiledFiles(iteration) == files, "%s != %s".format(recompiledFiles(iteration), files))
}
// Y.scala is compiled only at the beginning as changes to A.scala do not affect it
recompiledFilesInIteration(0, Set("X.scala", "Y.scala"))
// A.scala is changed and recompiled
recompiledFilesInIteration(1, Set("A.scala"))
// change in A.scala causes recompilation of B.scala, C.scala, D.scala which depend on transtiviely
// and by inheritance on A.scala
// X.scala is also recompiled because it depends by member reference on B.scala
// Note that Y.scala is not recompiled because it depends just on X through member reference dependency
recompiledFilesInIteration(2, Set("B.scala", "C.scala", "D.scala"))
assert(allCompilations.size == 3)
}
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