Refactoring command args and change the signal instance implement.

Wox/CommandArgs/InstallPluginCommandArg.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using Wox.Helper;
+
+namespace Wox.CommandArgs
+{
+    public class InstallPluginCommandArg : ICommandArg
+    {
+        public string Command
+        {
+            get { return "installplugin"; }
+        }
+
+        public void Execute(IList<string> args)
+        {
+            if (args.Count > 0)
+            {
+                var path = args[0];
+                if (!File.Exists(path))
+                {
+                    MessageBox.Show("Plugin " + path + " didn't exist");
+                    return;
+                }
+                PluginInstaller.Install(path);
+            }
+        }
+    }
+}