Add support for Scoverage (#571)

* Add initial work for ScoverageModule

* style: Move package scoverage from lib to contrib

Suggested by @lefou
> I think, it would be better to add under `mill.contrib.scoverage`.

Pull request: #571

* Initial changes to non-hardcoded scoverage version

* Using task context api to specify dataDir

Now measurement data will be written to:
PROJECT_ROOT/out/MODULE/scoverage/data/

and the html report will be written to:
PROJECT_ROOT/out/MODULE/scoverage/data/htmlReport/

* Remove wild card imports in scoverage

Also remove scoverage dependency from build.sc

* Move htmlReport into worker

Based on what I've seen in
scalalib, scalajslib, scalanativelib, playlib, and twirllib modules.

Still need to add tests

* Add basic docs + tests for scoverage

I still am working on testing the actual generation of
reports.

* Use cross-module for scoverage worker

Now we can support multiple versions of scoverage
by adding them to the crossmodule list.

Also now running the local publish script succeeds.

* Add scoverage to ci tests

* Add detailed ScoverageModule documentation

* Test scoverage dataDir

* Remove <pre> tags in scaladoc

* Add scoverage dependency in less hacky way

* Modify scoverage tests to check classpaths

* Put docs in alphabetical order

* Test classpaths for scoverage runtime

* Remove abstract def test: ScoverageTests

* Construct classloader differently

* Revert "Construct classloader differently"

This reverts commit fccf9a94cc38fb9e2be58a9ff90b00b65f339db6.

* Revert "Construct classloader differently"

Also fixes unfound error in html report

This reverts commit fccf9a94cc38fb9e2be58a9ff90b00b65f339db6.

* Fix classpath for scoverage worker

1 files changed, 21 insertions, 0 deletions

diff --git a/contrib/scoverage/worker/1.3.1/src/ScoverageReportWorkerImpl.scala b/contrib/scoverage/worker/1.3.1/src/ScoverageReportWorkerImpl.scala
new file mode 100644
index 00000000..44f506f7
--- /dev/null
+++ b/contrib/scoverage/worker/1.3.1/src/ScoverageReportWorkerImpl.scala
@@ -0,0 +1,21 @@
+package mill.contrib.scoverage.worker
+
+import mill.contrib.scoverage.api.ScoverageReportWorkerApi
+import mill.eval.PathRef
+import _root_.scoverage.Serializer.{ coverageFile, deserialize }
+import _root_.scoverage.IOUtils.{ findMeasurementFiles, invoked }
+import _root_.scoverage.report.ScoverageHtmlWriter
+
+class ScoverageReportWorkerImpl extends ScoverageReportWorkerApi {
+  def htmlReport(sources: Seq[PathRef], dataDir: String, selfDir: String) = {
+    val coverageFileObj = coverageFile(dataDir)
+    val coverage = deserialize(coverageFileObj)
+    coverage(invoked(findMeasurementFiles(dataDir)))
+    val Seq(PathRef(sourceFolderPath, _, _)) = sources
+    val sourceFolders = Seq(sourceFolderPath.toIO)
+    val htmlFolder = new java.io.File(s"${selfDir}/htmlReport")
+    htmlFolder.mkdir()
+    new ScoverageHtmlWriter(sourceFolders, htmlFolder, None)
+      .write(coverage)
+  }
+}