Add a filter parameter (default true for all files) to createJar().

Add createJar() filter test.

2 files changed, 13 insertions, 2 deletions

diff --git a/main/src/mill/modules/Jvm.scala b/main/src/mill/modules/Jvm.scala
index f0c0d8a9..b4f7fa94 100644
--- a/main/src/mill/modules/Jvm.scala
+++ b/main/src/mill/modules/Jvm.scala
@@ -209,7 +209,9 @@ object Jvm {
     m
   }
 
-  def createJar(inputPaths: Agg[Path], mainClass: Option[String] = None)
+  def createJar(inputPaths: Agg[Path],
+                mainClass: Option[String] = None,
+                fileFilter: (Path, RelPath) => Boolean = (p: Path, r: RelPath) => true)
                (implicit ctx: Ctx.Dest): PathRef = {
     val outputPath = ctx.dest / "out.jar"
     rm(outputPath)
@@ -228,7 +230,7 @@ object Jvm {
         (file, mapping) <-
           if (p.isFile) Iterator(p -> empty/p.last)
           else ls.rec(p).filter(_.isFile).map(sub => sub -> sub.relativeTo(p))
-        if !seen(mapping)
+        if !seen(mapping) && fileFilter(p, mapping)
       } {
         seen.add(mapping)
         val entry = new JarEntry(mapping.toString)
diff --git a/main/test/src/mill/eval/JavaCompileJarTests.scala b/main/test/src/mill/eval/JavaCompileJarTests.scala
index 37e4c119..e6d1c10a 100644
--- a/main/test/src/mill/eval/JavaCompileJarTests.scala
+++ b/main/test/src/mill/eval/JavaCompileJarTests.scala
@@ -39,6 +39,8 @@ object JavaCompileJarTests extends TestSuite{
         def allSources = T{ sourceRoot().flatMap(p => ls.rec(p.path)).map(PathRef(_)) }
         def classFiles = T{ compileAll(allSources()) }
         def jar = T{ Jvm.createJar(Loose.Agg(classFiles().path) ++ resourceRoot().map(_.path)) }
+        // Test createJar() with optional file filter.
+        def filterJar(fileFilter: (Path, RelPath) => Boolean) = T{ Jvm.createJar(Loose.Agg(classFiles().path) ++ resourceRoot().map(_.path), None, fileFilter) }
 
         def run(mainClsName: String) = T.command{
           %%('java, "-Duser.language=en", "-cp", classFiles().path, mainClsName)
@@ -116,6 +118,13 @@ object JavaCompileJarTests extends TestSuite{
           |""".stripMargin
       assert(jarContents.lines.toSeq == expectedJarContents.lines.toSeq)
 
+      // Create the Jar again, but this time, filter out the Foo files.
+      def noFoos(s: String) = !s.contains("Foo")
+      val filterFunc = (p: Path, r: RelPath) => noFoos(r.last)
+      filterJar(filterFunc)
+      val filteredJarContents = %%('jar, "-tf", evaluator.outPath/'filterJar/'dest/"out.jar")(evaluator.outPath).out.string
+      assert(filteredJarContents.lines.toSeq == expectedJarContents.lines.filter(noFoos(_)).toSeq)
+
       val executed = %%('java, "-cp", evaluator.outPath/'jar/'dest/"out.jar", "test.Foo")(evaluator.outPath).out.string
       assert(executed == (31337 + 271828) + System.lineSeparator)