improve name matching

MediaBrowser.Controller/Library/NameExtensions.cs

@@ -0,0 +1,41 @@
+using MediaBrowser.Common.Extensions;
+using MoreLinq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Controller.Library
+{
+    public static class NameExtensions
+    {
+        public static bool AreEqual(string name1, string name2)
+        {
+            name1 = NormalizeForComparison(name1);
+            name2 = NormalizeForComparison(name2);
+
+            return string.Equals(name1, name2, StringComparison.OrdinalIgnoreCase);
+        }
+
+        public static bool EqualsAny(IEnumerable<string> names, string name)
+        {
+            name = NormalizeForComparison(name);
+
+            return names.Any(i => string.Equals(NormalizeForComparison(i), name, StringComparison.OrdinalIgnoreCase));
+        }
+
+        private static string NormalizeForComparison(string name)
+        {
+            if (string.IsNullOrWhiteSpace(name))
+            {
+                return string.Empty;
+            }
+
+            return name.RemoveDiacritics();
+        }
+
+        public static IEnumerable<string> DistinctNames(this IEnumerable<string> names)
+        {
+            return names.DistinctBy(NormalizeForComparison, StringComparer.OrdinalIgnoreCase);
+        }
+    }
+}