Package standalone JARs (#139)

Author: lwronski

modules/build/src/main/scala/scala/build/options/PackageOptions.scala

@@ -3,6 +3,7 @@ package scala.build.options
 import scala.build.internal.Constants
 
 final case class PackageOptions(
+  standalone: Option[Boolean] = None,
   version: Option[String] = None,
   launcherApp: Option[String] = None,
   maintainer: Option[String] = None,
@@ -24,6 +25,9 @@ final case class PackageOptions(
 
   def isDockerEnabled: Boolean = dockerOptions.isDockerEnabled.getOrElse(false)
 
+  // default behaviour for building docker image is building standalone JARs
+  def isStandalone: Boolean = standalone.getOrElse(isDockerEnabled)
+
 }
 
 object PackageOptions {

modules/cli/src/main/scala/scala/cli/commands/Package.scala

@@ -392,10 +392,17 @@ object Package extends ScalaCommand[PackageOptions] {
     val tmpJarContent = os.read.bytes(os.Path(tmpJar))
     Files.deleteIfExists(tmpJar)
 
-    def dependencyEntries = build.artifacts.artifacts.map {
-      case (url, _) =>
-        ClassPathEntry.Url(url)
-    }
+    def dependencyEntries =
+      build.artifacts.artifacts.map {
+        case (url, artifactPath) =>
+          if (build.options.packageOptions.isStandalone) {
+            val path = os.Path(artifactPath)
+            ClassPathEntry.Resource(path.last, os.mtime(path), os.read.bytes(path))
+          }
+          else {
+            ClassPathEntry.Url(url)
+          }
+      }
     val byteCodeEntry = ClassPathEntry.Resource(s"${destPath.last}-content.jar", 0L, tmpJarContent)
 
     val allEntries    = Seq(byteCodeEntry) ++ dependencyEntries

modules/cli/src/main/scala/scala/cli/commands/PackageOptions.scala

@@ -33,7 +33,9 @@ final case class PackageOptions(
   @Group("Package")
   @HelpMessage("Generate an assembly JAR")
     assembly: Boolean = false,
-
+  @Group("Package")
+  @HelpMessage("Package standalone JARs")
+    standalone: Option[Boolean] = None,
   @Recurse
     packager: PackagerOptions = PackagerOptions(),
   @Group("Package")
@@ -71,6 +73,7 @@ final case class PackageOptions(
     baseOptions.copy(
       mainClass = mainClass.mainClass.filter(_.nonEmpty),
       packageOptions = baseOptions.packageOptions.copy(
+        standalone = standalone,
         version = Some(packager.version),
         launcherApp = packager.launcherApp,
         maintainer = packager.maintainer,

website/docs/reference/cli-options.md

@@ -428,6 +428,10 @@ Generate a library JAR rather than an executable JAR
 
 Generate an assembly JAR
 
+#### `--standalone`
+
+Package standalone JARs
+
 #### `--deb`
 
 Build debian package, available only on linux