Update powershell.js

lib/powershell.js

@@ -6,6 +6,17 @@ var scope = {
     require: global.require
 };
 
+scope.addslashes = function(string) {
+    return string.replace(/\\/g, '\\\\').
+        replace(/\u0008/g, '\\b').
+        replace(/\t/g, '\\t').
+        replace(/\n/g, '\\n').
+        replace(/\f/g, '\\f').
+        replace(/\r/g, '\\r').
+        replace(/'/g, '\\\'').
+        replace(/"/g, '\\"');
+}
+
 scope.execScript = function(scriptName, args) {
     var arguments = [
         "powershell.exe",
@@ -26,4 +37,20 @@ scope.execScript = function(scriptName, args) {
     return SHELL.exec(arguments.join(' '));
 };
 
+scope.execCommand = function(command) {
+    var arguments = [
+        "powershell.exe",
+        "-NoProfile",
+        "-ExecutionPolicy",
+        "ByPass",
+        "-nologo"
+        "-Command",
+        "\"& {",
+        scope.addslashes(command),
+        "}\""
+    ];
+
+    return SHELL.exec(arguments.join(' '));
+};
+
 return scope;