Add project files.

Lantean.QBTMudBlade/Extensions.cs

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+using Lantean.QBTMudBlade;
+using Lantean.QBTMudBlade.Models;
+
+namespace Lantean.QBTMudBlade
+{
+    public static class Extensions
+    {
+        public const char DirectorySeparator = '/';
+
+        public static string GetDirectoryPath(this string pathAndFileName)
+        {
+            return string.Join(DirectorySeparator, pathAndFileName.Split(DirectorySeparator)[..^1]);
+        }
+
+        public static string GetDirectoryPath(this ContentItem contentItem)
+        {
+            return contentItem.Name.GetDirectoryPath();
+        }
+
+        public static string GetFileName(this string pathAndFileName)
+        {
+            return pathAndFileName.Split(DirectorySeparator)[^1];
+        }
+
+        public static string GetFileName(this ContentItem contentItem)
+        {
+            return contentItem.Name.GetFileName();
+        }
+
+        public static string GetDescendantsKey(this string pathAndFileName, int? level = null)
+        {
+            var paths = pathAndFileName.Split(DirectorySeparator);
+            var index = level is null ? new Index(1, true) : new Index(level.Value);
+            return string.Join(DirectorySeparator, paths[0..index]) + DirectorySeparator;
+        }
+
+        public static string GetDescendantsKey(this ContentItem contentItem, int? level = null)
+        {
+            return contentItem.Name.GetDescendantsKey(level);
+        }
+
+        public static void CancelIfNotDisposed(this CancellationTokenSource cancellationTokenSource)
+        {
+            try
+            {
+                cancellationTokenSource.Cancel();
+            }
+            catch (ObjectDisposedException)
+            {
+                // disposed
+            }
+        }
+    }
+}