Refactoring start menu source

1. refactoriong start menu source
2. fix depth problems involved in last commit

Plugins/Wox.Plugin.Program/ProgramSources/Win32.cs

@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Wox.Infrastructure.Exception;
+using Wox.Infrastructure.Logger;
+
+namespace Wox.Plugin.Program.ProgramSources
+{
+    [Serializable]
+    public abstract class Win32 : ProgramSource
+    {
+        public int MaxDepth { get; set; } = -1;
+        public string[] Suffixes { get; set; } = { "" };
+
+        protected Program CreateEntry(string file)
+        {
+            var p = new Program
+            {
+                Title = Path.GetFileNameWithoutExtension(file),
+                IcoPath = file,
+                Path = file,
+                Directory = Directory.GetParent(file).FullName
+            };
+
+            switch (Path.GetExtension(file).ToLower())
+            {
+                case ".exe":
+                    p.ExecutableName = Path.GetFileName(file);
+                    try
+                    {
+                        var versionInfo = FileVersionInfo.GetVersionInfo(file);
+                        if (!string.IsNullOrEmpty(versionInfo.FileDescription))
+                        {
+                            p.Title = versionInfo.FileDescription;
+                        }
+                    }
+                    catch (Exception)
+                    {
+                    }
+                    break;
+            }
+            return p;
+        }
+
+        protected void GetAppFromDirectory(List<Program> apps, string directory, int depth)
+        {
+            if (MaxDepth == -1 || MaxDepth < depth)
+            {
+                foreach (var f in Directory.GetFiles(directory))
+                {
+                    if (Suffixes.Any(o => f.EndsWith("." + o)))
+                    {
+                        Program p;
+                        try
+                        {
+                            p = CreateEntry(f);
+                        }
+                        catch (Exception e)
+                        {
+                            var woxPluginException = new WoxPluginException("Program",
+                                $"GetAppFromDirectory failed: {directory}", e);
+                            Log.Exception(woxPluginException);
+                            continue;
+                        }
+                        apps.Add(p);
+                    }
+                }
+                foreach (var d in Directory.GetDirectories(directory))
+                {
+                    GetAppFromDirectory(apps, d, depth - 1);
+                }
+            }
+        }
+    }
+}