Added support for formatting that obeys tabsize and tabstospaces

OmniSharp.Tests/CodeFormat/CodeFormatTest.cs

@@ -22,7 +22,27 @@ public void Should_format_code()
 
             var handler = new CodeFormatHandler(new OmniSharpConfiguration());
             var buffer = handler.Format(new CodeFormatRequest {Buffer = code}).Buffer;
-			buffer.Replace("\r\n", "\n").ShouldEqual(expected);
+            buffer.Replace("\r\n", "\n").ShouldEqual(expected);
+        }
+
+        [Test]
+        public void Obeys_formatting_options()
+        {
+            string code =
+@"public class Test {
+public void ExampleMethod()
+{
+}
+}";
+
+            var handler = new CodeFormatHandler(new OmniSharpConfiguration());
+            var buffer = handler.Format(new CodeFormatRequest
+            {
+                Buffer = code,
+                TabSize = 4,
+                TabsToSpaces = false
+            }).Buffer;
+            buffer.ShouldContain('\t');
         }
     }
 }

OmniSharp/CodeFormat/CodeFormatHandler.cs

@@ -15,6 +15,10 @@ public CodeFormatResponse Format(CodeFormatRequest request)
         {
             var options = _config.TextEditorOptions;
             var policy = _config.CSharpFormattingOptions;
+
+            options.TabsToSpaces = request.TabsToSpaces;
+            options.TabSize = request.TabSize;
+
             var formatter = new CSharpFormatter(policy, options);
             formatter.FormattingMode = FormattingMode.Intrusive;
             var output = formatter.Format(request.Buffer);

OmniSharp/CodeFormat/CodeFormatRequest.cs

@@ -11,5 +11,9 @@ public bool ExpandTab
             get { return _expandTab; }
             set { _expandTab = value; }
         }
+
+        public bool TabsToSpaces { get; set; } = true;
+
+        public int TabSize { get; set; } = 4;
     }
 }