Merge pull request #27 from sadphi/wsl-fix

Add look and feel checks for WSL. fix #26

Author: bjornregnell

src/main/scala/introprog/Swing.scala

@@ -33,6 +33,14 @@ object Swing {
   def isOS(partOfName: String): Boolean =
     scala.sys.props("os.name").toLowerCase.contains(partOfName.toLowerCase)
 
+  /** Check whether `/proc/version` on this filesystem contains any of the strings in `s`. */
+  def isInProc(s: String*): Boolean = {
+    val searchString = s.mkString("|")
+    val cmd = Seq("grep", "-i", "-P", "-s", "-q", searchString, "/proc/version")
+    val p = sys.process.Process(cmd)
+    util.Try(p.! == 0).getOrElse(false)
+  }
+
   private var isInit = false
 
   /** Init the Swing GUI toolkit and set platform-specific look and feel.*/
@@ -43,8 +51,8 @@ object Swing {
 
   private def setPlatformSpecificLookAndFeel(): Unit = {
     import javax.swing.UIManager.setLookAndFeel
-    if (isOS("linux")) findLookAndFeel("gtk").foreach(setLookAndFeel)
-    else if (isOS("win")) findLookAndFeel("win").foreach(setLookAndFeel)
+    if (isOS("win") || isInProc("windows", "wsl", "microsoft")) findLookAndFeel("win").foreach(setLookAndFeel)
+    else if (isOS("linux")) findLookAndFeel("gtk").foreach(setLookAndFeel)
     else if (isOS("mac")) findLookAndFeel("apple").foreach(setLookAndFeel)
     else javax.swing.UIManager.setLookAndFeel(
       javax.swing.UIManager.getSystemLookAndFeelClassName()