Disable SA1027 when useTabs is true

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/SpacingRules/SA1027UnitTests.cs

@@ -17,6 +17,8 @@ namespace StyleCop.Analyzers.Test.SpacingRules
     /// </summary>
     public class SA1027UnitTests : CodeFixVerifier
     {
+        private string settings;
+
         /// <summary>
         /// Verifies that tabs used inside string and char literals are not producing diagnostics.
         /// </summary>
@@ -230,6 +232,38 @@ Comment 2
             await this.VerifyCSharpFixAsync(testCode, fixedTestCode, cancellationToken: CancellationToken.None).ConfigureAwait(false);
         }
 
+        [Fact]
+        public async Task TestUseTabsSettingAsync()
+        {
+            this.settings = @"
+{
+    ""settings"": {
+        ""indentation"": {
+            ""useTabs"": true
+        }
+    }
+}
+";
+
+            var testCode =
+                "using\tSystem.Diagnostics;\r\n" +
+                "\r\n" +
+                "public\tclass\tFoo\r\n" +
+                "{\r\n" +
+                "\tpublic void Bar()\r\n" +
+                "\t{\r\n" +
+                "\t  \t// Comment\r\n" +
+                "\t \tDebug.Indent();\r\n" +
+                "   \t}\r\n" +
+                "}\r\n";
+
+            await this.VerifyCSharpDiagnosticAsync(testCode, EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
+        }
+
+        /// <inheritdoc/>
+        protected override string GetSettings() =>
+            this.settings;
+
         /// <inheritdoc/>
         protected override IEnumerable<DiagnosticAnalyzer> GetCSharpDiagnosticAnalyzers()
         {

StyleCop.Analyzers/StyleCop.Analyzers/SpacingRules/SA1027TabsMustNotBeUsed.cs

@@ -8,6 +8,7 @@ namespace StyleCop.Analyzers.SpacingRules
     using Microsoft.CodeAnalysis;
     using Microsoft.CodeAnalysis.CSharp;
     using Microsoft.CodeAnalysis.Diagnostics;
+    using StyleCop.Analyzers.Settings.ObjectModel;
 
     /// <summary>
     /// The C# code contains a tab character.
@@ -38,7 +39,7 @@ internal class SA1027TabsMustNotBeUsed : DiagnosticAnalyzer
             new DiagnosticDescriptor(DiagnosticId, Title, MessageFormat, AnalyzerCategory.SpacingRules, DiagnosticSeverity.Warning, AnalyzerConstants.EnabledByDefault, Description, HelpLink);
 
         private static readonly Action<CompilationStartAnalysisContext> CompilationStartAction = HandleCompilationStart;
-        private static readonly Action<SyntaxTreeAnalysisContext> SyntaxTreeAction = HandleSyntaxTree;
+        private static readonly Action<SyntaxTreeAnalysisContext, StyleCopSettings> SyntaxTreeAction = HandleSyntaxTree;
 
         /// <inheritdoc/>
         public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } =
@@ -55,8 +56,13 @@ private static void HandleCompilationStart(CompilationStartAnalysisContext conte
             context.RegisterSyntaxTreeActionHonorExclusions(SyntaxTreeAction);
         }
 
-        private static void HandleSyntaxTree(SyntaxTreeAnalysisContext context)
+        private static void HandleSyntaxTree(SyntaxTreeAnalysisContext context, StyleCopSettings settings)
         {
+            if (settings.Indentation.UseTabs)
+            {
+                return;
+            }
+
             SyntaxNode root = context.Tree.GetCompilationUnitRoot(context.CancellationToken);
             foreach (var trivia in root.DescendantTrivia(descendIntoTrivia: true))
             {