Highlight tabs present in indentation.

YamlDotNet.sln

@@ -8,6 +8,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Dependencies", "Dependencie
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{69EE9636-55BA-49C2-827E-D5684221C345}"
 	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
 		LICENSE = LICENSE
 		YamlDotNet.build = YamlDotNet.build
 		YamlDotNet.Converters.nuspec = YamlDotNet.Converters.nuspec

YamlDotNetEditor/YamlDotNetEditor.cs

@@ -72,6 +72,7 @@ class YamlDotNetEditor : IClassifier
 		private readonly IClassificationType _tag;
 		private readonly IClassificationType _symbol;
 		private readonly IClassificationType _directive;
+		private readonly IClassificationType _tab;
 
 		internal YamlDotNetEditor(IClassificationTypeRegistryService registry)
 		{
@@ -83,6 +84,7 @@ internal YamlDotNetEditor(IClassificationTypeRegistryService registry)
 			_tag = registry.GetClassificationType("YamlTag");
 			_symbol = registry.GetClassificationType("YamlSymbol");
 			_directive = registry.GetClassificationType("YamlDirective");
+			_tab = registry.GetClassificationType("YamlTab");
 		}
 
 		/// <summary>
@@ -113,6 +115,23 @@ public IList<ClassificationSpan> GetClassificationSpans(SnapshotSpan span)
 				text = text.Substring(0, commentIndex);
 			}
 
+			var match = Regex.Match(text, @"^( *(\t+))+");
+			if (match.Success)
+			{
+				foreach (Capture capture in match.Groups[2].Captures)
+				{
+					classifications.Add(
+						new ClassificationSpan(
+							new SnapshotSpan(
+								span.Snapshot,
+								new Span(span.Start + capture.Index, capture.Length)
+							),
+							_tab
+						)
+					);
+				}
+			}
+
 			try
 			{
 				var scanner = new Scanner(new StringReader(text));

YamlDotNetEditor/YamlDotNetEditorFormat.cs

@@ -125,5 +125,19 @@ public YamlDirectiveFormat()
 
 		}
 	}
+
+	[Export(typeof(EditorFormatDefinition))]
+	[ClassificationType(ClassificationTypeNames = "YamlDotNetEditor")]
+	[Name("YamlTab")]
+	[UserVisible(true)] //this should be visible to the end user
+	[Order(Before = Priority.Default)] //set the priority to be after the default classifiers
+	internal sealed class YamlTabFormat : ClassificationFormatDefinition
+	{
+		public YamlTabFormat()
+		{
+			DisplayName = "YAML Tab"; //human readable version of the name
+			BackgroundColor = Color.FromRgb(182, 0, 0);
+		}
+	}
 	#endregion //Format definition
 }

YamlDotNetEditor/YamlDotNetEditorType.cs

@@ -54,5 +54,9 @@ internal static class YamlDotNetEditorClassificationDefinition
 		[Export(typeof(ClassificationTypeDefinition))]
 		[Name("YamlDirective")]
 		internal static ClassificationTypeDefinition YamlDirectiveType = null;
+
+		[Export(typeof(ClassificationTypeDefinition))]
+		[Name("YamlTab")]
+		internal static ClassificationTypeDefinition YamlTabType = null;
 	}
 }

YamlDotNetEditor/source.extension.vsixmanifest

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PackageManifest Version="2.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2011" xmlns:d="http://schemas.microsoft.com/developer/vsx-schema-design/2011">
   <Metadata>
-	<Identity Id="YamlDotNetEditor..074a7b74-655b-409c-b5ac-a028f12d6e89" Version="1.0" Language="en-US" Publisher="Antoine Aubry" />
+	<Identity Id="YamlDotNetEditor..074a7b74-655b-409c-b5ac-a028f12d6e89" Version="1.1" Language="en-US" Publisher="Antoine Aubry" />
 	<DisplayName>YamlDotNetEditor</DisplayName>
 	<Description xml:space="preserve">This is a YAML editor classifier extension to the Visual Studio Editor.</Description>
 	<License>LICENSE</License>