Implement FilePath.Equals() and GetHashCode()

LibGit2Sharp/Core/FilePath.cs

@@ -1,8 +1,9 @@
-using System.IO;
+using System;
+using System.IO;
 
 namespace LibGit2Sharp.Core
 {
-    internal class FilePath
+    internal class FilePath : IEquatable<FilePath>
     {
         internal static FilePath Empty = new FilePath(string.Empty);
 
@@ -56,5 +57,20 @@ private static string Replace(string path, char oldChar, char newChar)
 
             return path == null ? null : path.Replace(oldChar, newChar);
         }
+
+        public bool Equals(FilePath other)
+        {
+            return other == null ? posix == null : string.Equals(posix, other.posix, StringComparison.Ordinal);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return Equals(obj as FilePath);
+        }
+
+        public override int GetHashCode()
+        {
+            return posix == null ? 0 : posix.GetHashCode();
+        }
     }
 }