[feat:] forgot to git-add the wiki source files... here they are

Wiki/WikiService.cs

@@ -0,0 +1,76 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Logof_Client.Wiki;
+
+public class WikiService
+{
+    public string WikiRoot { get; }
+    public string WikiRootFullPath { get; }
+
+    public WikiService(string wikiRoot = "wiki")
+    {
+        // prefer global wiki storage path if configured
+        if (Global._instance != null && !string.IsNullOrWhiteSpace(Global._instance.wiki_storage_path))
+        {
+            var cfg = Global._instance.wiki_storage_path;
+            WikiRootFullPath = Path.IsPathRooted(cfg)
+                ? cfg
+                : Path.Combine(Directory.GetCurrentDirectory(), cfg);
+            WikiRoot = WikiRootFullPath;
+        }
+        else
+        {
+            WikiRoot = wikiRoot;
+            WikiRootFullPath = Path.Combine(Directory.GetCurrentDirectory(), wikiRoot);
+        }
+    }
+
+    public List<WikiItem> GetRootItems()
+    {
+        var list = new List<WikiItem>();
+
+        if (!Directory.Exists(WikiRootFullPath)) return list;
+
+        var dirInfo = new DirectoryInfo(WikiRootFullPath);
+
+        // Add folders
+        foreach (var dir in dirInfo.GetDirectories())
+        {
+            list.Add(BuildFolderItem(dir));
+        }
+
+        // Add files in root
+        foreach (var file in dirInfo.GetFiles("*.md"))
+        {
+            list.Add(new WikiItem { Name = file.Name, Path = file.FullName, IsFolder = false });
+        }
+
+        return list.OrderBy(i => i.IsFolder ? 0 : 1).ToList();
+    }
+
+    private WikiItem BuildFolderItem(DirectoryInfo dir)
+    {
+        var node = new WikiItem { Name = dir.Name, Path = dir.FullName, IsFolder = true };
+
+        foreach (var subdir in dir.GetDirectories())
+        {
+            node.Children.Add(BuildFolderItem(subdir));
+        }
+
+        foreach (var file in dir.GetFiles("*.md"))
+        {
+            node.Children.Add(new WikiItem { Name = file.Name, Path = file.FullName, IsFolder = false });
+        }
+
+        return node;
+    }
+
+    public Task<string?> LoadFileContentAsync(string path)
+    {
+        if (!File.Exists(path)) return Task.FromResult<string?>(null);
+        return File.ReadAllTextAsync(path);
+    }
+}