CompareOptions: Add an enum PatchWhiteSpaceMode.

This will allow using the following diff options:
--ignore-space-at-eol
--ignore-space-change
--ignore-all-space

Author: Divad-H

LibGit2Sharp/CompareOptions.cs

@@ -2,6 +2,29 @@
 
 namespace LibGit2Sharp
 {
+    /// <summary>
+    /// Represents a mode for handling whitespace while creating a patch.
+    /// </summary>
+    public enum PatchWhitespaceMode
+    {
+        /// <summary>
+        /// Do not ignore changes in whitespace when comparing lines.
+        /// </summary>
+        DontIgnoreWhitespace = 0,
+        /// <summary>
+        /// Ignore whitespace when comparing lines. This ignores differences even if one line has whitespace where the other line has none.
+        /// </summary>
+        IgnoreAllWhitespace = 1,
+        /// <summary>
+        /// Ignore changes in amount of whitespace. This ignores whitespace at line end, and considers all other sequences of one or more whitespace characters to be equivalent.
+        /// </summary>
+        IgnoreWhitespaceChange = 2,
+        /// <summary>
+        /// Ignore changes in whitespace at EOL.
+        /// </summary>
+        IgnoreWhitespaceEol = 3,
+    }
+
     /// <summary>
     /// Options to define file comparison behavior.
     /// </summary>
@@ -14,6 +37,7 @@ public CompareOptions()
         {
             ContextLines = 3;
             InterhunkLines = 0;
+            PatchWhitespaceMode = PatchWhitespaceMode.DontIgnoreWhitespace;
             Algorithm = DiffAlgorithm.Myers;
         }
 
@@ -29,6 +53,11 @@ public CompareOptions()
         /// </summary>
         public int InterhunkLines { get; set; }
 
+        /// <summary>
+        /// The mode for handling whitespace when comparing lines
+        /// </summary>
+        public PatchWhitespaceMode PatchWhitespaceMode { get; set; }
+
         /// <summary>
         /// Options for rename detection. If null, the `diff.renames` configuration setting is used.
         /// </summary>