Initial try at a Mac implementation

core/js/src/main/scala/tf/bug/dirs/JSTarget.scala

@@ -0,0 +1,27 @@
+package tf.bug.dirs
+import scala.scalajs.js
+import scala.scalajs.js.annotation.JSImport
+
+/** Necessary facades around the Node.js `os` module for discovering dirs
+  */
+object os {
+  @js.native
+  @JSImport("os", "homedir")
+  def homedir(): String = js.native
+
+  @js.native
+  @JSImport("process", "platform")
+  def platform(): String = js.native
+
+}
+object JSTarget extends Target {
+  def homedir: Option[Path] = Some(Path.get(os.homedir()))
+  def platform: Platform = {
+    val osName = jsPlatform()
+    osName match {
+      case "win32"  => Platform.Windows
+      case "darwin" => Platform.Mac
+      case _        => Platform.Unknown(osName)
+    }
+  }
+}

core/js/src/main/scala/tf/bug/dirs/MacPlatform.scala

@@ -3,7 +3,7 @@ package tf.bug.dirs
 import java.nio.file.{Path, Paths}
 
 object MacPlatform extends Mac {
-  def home: Option[Path] = Some(Paths.get(os.homedir()))
+  def home: Option[Path] = JSTarget.homedir
   def cache: Option[Path] = home.map(h => Paths.get(h + "/Library/Caches"))
   def config: Option[Path] =
     home.map(h => Paths.get(h + "/Library/Application Support"))

core/jvm/src/main/scala/tf/bug/dirs/JVMTarget.scala

@@ -0,0 +1,16 @@
+package tf.bug.dirs
+
+
+
+object JVMTarget extends Target {
+  def platform: Platform = {
+    val osName = System.getProperty("os.name")
+    if (osName.contains("Windows")) {
+      Platform.Windows
+    } else {
+      Platform.Unknown(osName)
+    }
+  }
+
+  def homeDir: Option[Path] = Some(Paths.get(System.getProperty("user.home")))
+}

core/jvm/src/main/scala/tf/bug/dirs/MacPlatform.scala

@@ -3,7 +3,7 @@ package tf.bug.dirs
 import java.nio.file.{Path, Paths}
 
 object MacPlatform extends Mac {
-  def home: Option[Path] = Some(Paths.get(System.getProperty("user.home")))
+  def home: Option[Path] = JVMTarget.homeDir
   def cache: Option[Path] = home.map(h => Paths.get(h + "/Library/)Caches"))
   def config: Option[Path] =
     home.map(h => Paths.get(h + "/Library/)Application Support"))

core/shared/src/main/scala/tf/bug/dirs/Dirs.scala

@@ -14,16 +14,7 @@ object Dirs {
   lazy val windows: Windows = WindowsPlatform
   lazy val mac: Mac = MacPlatform
 
-  lazy val platform: Platform = {
-    val osName = System.getProperty("os.name")
-    if(osName.contains("Windows")) {
-      Platform.Windows
-    } else if (osName.contains("Mac")) {
-      Platform.Mac 
-  }  else {
-      Platform.Unknown(osName)
-    }
-  }
+  lazy val platform: Platform = Target.platform
 
   def audio: Option[Path] = platform match {
     case Platform.Windows => this.windows.shGetKnownFolderPath(this.windows.folderIdMusic)

core/shared/src/main/scala/tf/bug/dirs/Target.scala

@@ -0,0 +1,8 @@
+package tf.bug.dirs
+
+import java.nio.file.Path
+
+trait Target {
+  def homeDir: Option[Path]
+  def platform: Platform
+}