Add validation prior to update portability

Author: jjw24

Wox.Core/Configuration/IPortable.cs

@@ -1,4 +1,4 @@
-
+
 namespace Wox.Core.Configuration
 {
     public interface IPortable
@@ -12,6 +12,6 @@ public interface IPortable
         bool IsPortableModeEnabled();
         void MoveUserDataFolder(string fromLocation, string toLocation);
         void VerifyUserDataAfterMove(string fromLocation, string toLocation);
-        void CleanUpFolderAfterPortabilityUpdate();
+        bool CanUpdatePortability();
     }
 }

Wox.Core/Configuration/Portable.cs

@@ -171,5 +171,22 @@ public void PreStartCleanUpAfterPortabilityUpdate()
                 return;
             }
         }
+
+        public bool CanUpdatePortability()
+        {
+            var roamingLocationExists = DataLocation.RoamingDataPath.LocationExists();
+            var portableLocationExists = DataLocation.PortableDataPath.LocationExists();
+
+            if(roamingLocationExists && portableLocationExists)
+            {
+                MessageBox.Show(string.Format("Wox detected your user data exists both in {0} and " +
+                                    "{1}. {2}{2}Please delete {1} in order to proceed. No changes have occured.", 
+                                    DataLocation.PortableDataPath, DataLocation.RoamingDataPath, Environment.NewLine));
+
+                return false;
+            }
+
+            return true;
+        }
     }
 }

Wox/ViewModel/SettingWindowViewModel.cs

@@ -54,6 +54,9 @@ public bool PortableMode
             get { return _portableMode; }
             set
             {
+                if (!_portable.CanUpdatePortability())
+                    return;
+                
                 _portableMode = value;
 
                 Settings.PortableMode = value;