Added SBT build and a piece of test code

Author: m-tabaza

source/ports/scala_port/.gitignore

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+target/
+.bloop/
+.vscode/
+.bsp/
+.metals/
+*.log

source/ports/scala_port/.scalafmt.conf

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+version = "2.7.4"

source/ports/scala_port/README.md

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+# Metacall Scala Port
+
+## Setup
+
+To set up Scala & SBT, use [Coursier](https://get-coursier.io/docs/cli-installation). After getting the `cs` executable, run `cs setup` and follow the prompt.
+
+## Testing
+
+To run the tests, run `sbt test` in this README's directory.
+
+Don't forget to set these environment variables:
+```
+LD_LIBRARY_PATH
+LOADER_SCRIPT_PATH
+LOADER_LIBRARY_PATH
+CONFIGURATION_PATH
+SERIAL_LIBRARY_PATH
+DETOUR_LIBRARY_PATH
+PORT_LIBRARY_PATH
+```
+
+> Note: You'll find the bindings and the code that runs on `sbt test` in `src/main/scala/Metacall.scala`.

source/ports/scala_port/metacall.scala

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+// DO NOT EDIT! This file is auto-generated.
+// This file enables sbt-bloop to create bloop config files.
+
+addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.4.6-15-209c2a5c")

source/ports/scala_port/project/metals.sbt

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+// DO NOT EDIT! This file is auto-generated.
+// This file enables sbt-bloop to create bloop config files.
+
+addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.4.6-15-209c2a5c")

source/ports/scala_port/project/project/metals.sbt

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+package metacall
+
+import com.sun.jna._
+
+trait MetacallBindings extends Library {
+  def metacall_load_from_file(
+      runtime: String,
+      paths: Array[String],
+      size: Int,
+      handle: Array[Pointer]
+  ): Int
+
+  def metacallv_s(
+      functionName: String,
+      args: Array[Pointer],
+      argsSize: Int
+  ): Pointer
+
+  def metacall_initialize(): Int
+
+  def metacall_value_create_string(str: String, byteSize: Int): Pointer
+
+  def metacall_value_create_int(i: Int): Pointer
+
+  def metacall_destroy(value: Pointer): Int
+}
+
+object Metacall {
+  // CAUTION: Always check pointers passed to metacall (should not be Java null)
+
+  val mc = Native.load("metacall", classOf[MetacallBindings])
+  import mc._
+
+  metacall_initialize()
+
+  println(
+    metacall_load_from_file(
+      "node",
+      Array("./src/test/scala/main.js"),
+      1,
+      Array.empty
+    )
+  ) // outputs 1
+
+  // Call hello
+  val arg = metacall_value_create_string("Jack", "Jack".getBytes().length)
+  println("ARG: " + arg.getString(0)) // works!
+  val r = metacallv_s("hello", Array(arg), 1)
+  println("R1: " + r) // does not work...
+  metacall_destroy(arg) // works!
+
+  // Call increment
+  val n = metacall_value_create_int(50)
+  println("N: " + n.getInt(0)) // works!
+  val r2 = metacallv_s("increment", Array(n), 1)
+  println("R2: " + r2) // does not work...
+}

source/ports/scala_port/src/main/scala/Metacall.scala

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+package metacall
+
+import org.scalatest.flatspec.AnyFlatSpec
+
+class MetacallSpec extends AnyFlatSpec {
+  "Metacall" should "work" in {
+    Metacall
+  }
+}

source/ports/scala_port/src/test/scala/MetacallSpec.scala

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+function hello(name) {
+    console.log('Argument: ', name)
+    console.log(name)
+    if (name) return `Hello, ${name}!`
+    else return "Hello!"
+}
+
+function increment(n) {
+    return n + 1
+}
+
+function env() {
+    console.log(process.env);
+}
+
+module.exports = { hello, env, increment }