Refactor to support multiple program sources #42

App Paths is supported now #41

Wox.Plugin.System/AppPathsProgramSource.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Wox.Plugin.System
+{
+    public class AppPathsProgramSource: AbstractProgramSource
+    {
+        public AppPathsProgramSource()
+        {
+            this.BonusPoints = -10;
+        }
+
+        public override List<Program> LoadPrograms()
+        {
+            var list = new List<Program>();
+            ReadAppPaths(@"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths", list);
+            ReadAppPaths(@"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\App Paths", list); //TODO: need test more on 64-bit
+
+            return list;
+        }
+
+        private void ReadAppPaths(string rootpath, List<Program> list)
+        {
+            using (var root = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(rootpath))
+            {
+                if (root == null) return;
+                foreach (var item in root.GetSubKeyNames())
+                {
+                    using (var key = root.OpenSubKey(item))
+                    {
+                        object path = key.GetValue("");
+                        if (path is string && global::System.IO.File.Exists((string)path))
+                            list.Add(CreateEntry((string)path));
+
+                        key.Close();
+                    }
+                }
+            }
+        }
+    }
+}