1 files changed, 143 insertions, 0 deletions
diff --git a/MediaBrowser.Controller/Sorting/SortExtensions.cs b/MediaBrowser.Controller/Sorting/SortExtensions.cs
new file mode 100644
index 000000000..ec8ee5a11
--- /dev/null
+++ b/MediaBrowser.Controller/Sorting/SortExtensions.cs
@@ -0,0 +1,143 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MediaBrowser.Controller.Sorting
+{
+    public static class SortExtensions
+    {
+        public static IEnumerable<T> OrderByString<T>(this IEnumerable<T> list, Func<T, string> getName)
+        {
+            return list.OrderBy(getName, new AlphanumComparator());
+        }
+
+        public static IEnumerable<T> OrderByStringDescending<T>(this IEnumerable<T> list, Func<T, string> getName)
+        {
+            return list.OrderByDescending(getName, new AlphanumComparator());
+        }
+
+        public static IOrderedEnumerable<T> ThenByString<T>(this IOrderedEnumerable<T> list, Func<T, string> getName)
+        {
+            return list.ThenBy(getName, new AlphanumComparator());
+        }
+
+        public static IOrderedEnumerable<T> ThenByStringDescending<T>(this IOrderedEnumerable<T> list, Func<T, string> getName)
+        {
+            return list.ThenByDescending(getName, new AlphanumComparator());
+        }
+
+        private class AlphanumComparator : IComparer<string>
+        {
+            private enum ChunkType { Alphanumeric, Numeric };
+
+            private static bool InChunk(char ch, char otherCh)
+            {
+                var type = ChunkType.Alphanumeric;
+
+                if (char.IsDigit(otherCh))
+                {
+                    type = ChunkType.Numeric;
+                }
+
+                if ((type == ChunkType.Alphanumeric && char.IsDigit(ch))
+                    || (type == ChunkType.Numeric && !char.IsDigit(ch)))
+                {
+                    return false;
+                }
+
+                return true;
+            }
+
+            public static int CompareValues(string s1, string s2)
+            {
+                if (s1 == null || s2 == null)
+                {
+                    return 0;
+                }
+
+                int thisMarker = 0, thisNumericChunk = 0;
+                int thatMarker = 0, thatNumericChunk = 0;
+
+                while ((thisMarker < s1.Length) || (thatMarker < s2.Length))
+                {
+                    if (thisMarker >= s1.Length)
+                    {
+                        return -1;
+                    }
+                    else if (thatMarker >= s2.Length)
+                    {
+                        return 1;
+                    }
+                    char thisCh = s1[thisMarker];
+                    char thatCh = s2[thatMarker];
+
+                    StringBuilder thisChunk = new StringBuilder();
+                    StringBuilder thatChunk = new StringBuilder();
+
+                    while ((thisMarker < s1.Length) && (thisChunk.Length == 0 || InChunk(thisCh, thisChunk[0])))
+                    {
+                        thisChunk.Append(thisCh);
+                        thisMarker++;
+
+                        if (thisMarker < s1.Length)
+                        {
+                            thisCh = s1[thisMarker];
+                        }
+                    }
+
+                    while ((thatMarker < s2.Length) && (thatChunk.Length == 0 || InChunk(thatCh, thatChunk[0])))
+                    {
+                        thatChunk.Append(thatCh);
+                        thatMarker++;
+
+                        if (thatMarker < s2.Length)
+                        {
+                            thatCh = s2[thatMarker];
+                        }
+                    }
+
+                    int result = 0;
+                    // If both chunks contain numeric characters, sort them numerically
+                    if (char.IsDigit(thisChunk[0]) && char.IsDigit(thatChunk[0]))
+                    {
+                        if (!int.TryParse(thisChunk.ToString(), out thisNumericChunk))
+                        {
+                            return 0;
+                        }
+                        if (!int.TryParse(thatChunk.ToString(), out thatNumericChunk))
+                        {
+                            return 0;
+                        }
+
+                        if (thisNumericChunk < thatNumericChunk)
+                        {
+                            result = -1;
+                        }
+
+                        if (thisNumericChunk > thatNumericChunk)
+                        {
+                            result = 1;
+                        }
+                    }
+                    else
+                    {
+                        result = thisChunk.ToString().CompareTo(thatChunk.ToString());
+                    }
+
+                    if (result != 0)
+                    {
+                        return result;
+                    }
+                }
+
+                return 0;
+            }
+
+            public int Compare(string x, string y)
+            {
+                return CompareValues(x, y);
+            }
+        }
+    }
+}