From 6f8ccab788e85e025eaa44b67a1487bf419afb53 Mon Sep 17 00:00:00 2001
From: Bond_009 <bond.009@outlook.com>
Date: Sat, 19 Jun 2021 18:02:33 +0200
Subject: Move non-jellyfin extensions to separate project

---
 src/Jellyfin.Extensions/ShuffleExtensions.cs | 41 ++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/Jellyfin.Extensions/ShuffleExtensions.cs

(limited to 'src/Jellyfin.Extensions/ShuffleExtensions.cs')

diff --git a/src/Jellyfin.Extensions/ShuffleExtensions.cs b/src/Jellyfin.Extensions/ShuffleExtensions.cs
new file mode 100644
index 0000000000..4e481983f3
--- /dev/null
+++ b/src/Jellyfin.Extensions/ShuffleExtensions.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+
+namespace Jellyfin.Extensions
+{
+    /// <summary>
+    /// Provides <c>Shuffle</c> extensions methods for <see cref="IList{T}" />.
+    /// </summary>
+    public static class ShuffleExtensions
+    {
+        private static readonly Random _rng = new Random();
+
+        /// <summary>
+        /// Shuffles the items in a list.
+        /// </summary>
+        /// <param name="list">The list that should get shuffled.</param>
+        /// <typeparam name="T">The type.</typeparam>
+        public static void Shuffle<T>(this IList<T> list)
+        {
+            list.Shuffle(_rng);
+        }
+
+        /// <summary>
+        /// Shuffles the items in a list.
+        /// </summary>
+        /// <param name="list">The list that should get shuffled.</param>
+        /// <param name="rng">The random number generator to use.</param>
+        /// <typeparam name="T">The type.</typeparam>
+        public static void Shuffle<T>(this IList<T> list, Random rng)
+        {
+            int n = list.Count;
+            while (n > 1)
+            {
+                int k = rng.Next(n--);
+                T value = list[k];
+                list[k] = list[n];
+                list[n] = value;
+            }
+        }
+    }
+}
-- 
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