Add compabitility with WSL

opener.js

@@ -3,11 +3,24 @@
 "use strict";
 
 var childProcess = require("child_process");
+var os = require('os');
 
 function opener(args, options, callback) {
+
+    var platform = process.platform;
+
+    // Attempt to detect Windows Subystem for Linux (WSL).
+    // Identifies itself as Linux (which works in most cases), but in this specific case we need to treat it as actually
+    // being Windows. The "Windows-way" of opening a browser through cmd.exe works just fine here.
+    if(platform === "linux" && os.release().indexOf("Microsoft") !== -1){
+
+        platform = "win32";
+    }
+
     // http://stackoverflow.com/q/1480971/3191, but see below for Windows.
-    var command = process.platform === "win32" ? "cmd" :
-                  process.platform === "darwin" ? "open" :
+    // For proper functioning on WSL (see above) the Windows command needs to be "cmd.exe" (not merely "cmd").
+    var command = platform === "win32" ? "cmd.exe" :
+                  platform === "darwin" ? "open" :
                   "xdg-open";
 
     if (typeof args === "string") {
@@ -20,15 +33,15 @@ function opener(args, options, callback) {
     }
 
     if (options && typeof options === "object" && options.command) {
-        if (process.platform === "win32") {
+        if (platform === "win32") {
             // *always* use cmd on windows
             args = [options.command].concat(args);
         } else {
             command = options.command;
         }
     }
 
-    if (process.platform === "win32") {
+    if (platform === "win32") {
         // On Windows, we really want to use the "start" command. But, the rules regarding arguments with spaces, and
         // escaping them with quotes, can get really arcane. So the easiest way to deal with this is to pass off the
         // responsibility to "cmd /c", which has that logic built in.