feat: Remove excluded files from json/html reports (#3281)

* Remove excluded files from json/html reports

* Remove file contents but keep file names

* Remove string interpolation

---------

Co-authored-by: Rouke Broersma <Rouke.Broersma@infosupport.com>

Author: dgounaris

src/Stryker.Core/Stryker.Core/Reporters/Json/JsonReport.cs

@@ -3,6 +3,7 @@
 using Stryker.Abstractions.Options;
 using Stryker.Abstractions.ProjectComponents;
 using Stryker.Abstractions.Reporting;
+using Stryker.Core.ProjectComponents;
 using Stryker.Core.Reporters.Json.SourceFiles;
 using Stryker.Core.Reporters.Json.TestFiles;
 
@@ -25,39 +26,47 @@ private JsonReport(IStrykerOptions options, IReadOnlyProjectComponent mutationRe
 
         ProjectRoot = mutationReport.FullPath;
 
-        Merge(Files, GenerateReportComponents(mutationReport));
+        Merge(Files, GenerateReportComponents(options, mutationReport));
         AddTestFiles(testProjectsInfo);
     }
 
     public static IJsonReport Build(IStrykerOptions options, IReadOnlyProjectComponent mutationReport, ITestProjectsInfo testProjectsInfo) => new JsonReport(options, mutationReport, testProjectsInfo);
 
-    private IDictionary<string, ISourceFile> GenerateReportComponents(IReadOnlyProjectComponent component)
+    private Dictionary<string, ISourceFile> GenerateReportComponents(IStrykerOptions options, IReadOnlyProjectComponent component)
     {
         var files = new Dictionary<string, ISourceFile>();
+
         if (component is IFolderComposite folder)
         {
-            Merge(files, GenerateFolderReportComponents(folder));
+            Merge(files, GenerateFolderReportComponents(options, folder));
         }
         else if (component is IReadOnlyFileLeaf file)
         {
-            Merge(files, GenerateFileReportComponents(file));
+            Merge(files, GenerateFileReportComponents(options, file));
         }
 
         return files;
     }
 
-    private IDictionary<string, ISourceFile> GenerateFolderReportComponents(IFolderComposite folderComponent)
+    private Dictionary<string, ISourceFile> GenerateFolderReportComponents(IStrykerOptions options, IFolderComposite folderComponent)
     {
         var files = new Dictionary<string, ISourceFile>();
         foreach (var child in folderComponent.Children)
         {
-            Merge(files, GenerateReportComponents(child));
+            Merge(files, GenerateReportComponents(options, child));
         }
 
         return files;
     }
 
-    private static IDictionary<string, ISourceFile> GenerateFileReportComponents(IReadOnlyFileLeaf fileComponent) => new Dictionary<string, ISourceFile> { { fileComponent.FullPath, new SourceFile(fileComponent) } };
+    private static Dictionary<string, ISourceFile> GenerateFileReportComponents(IStrykerOptions options, IReadOnlyFileLeaf fileComponent)
+    {
+        if (fileComponent.IsComponentExcluded(options.Mutate))
+        {
+            return new Dictionary<string, ISourceFile> { { fileComponent.FullPath, SourceFile.Ignored } };
+        }
+        return new Dictionary<string, ISourceFile> { { fileComponent.FullPath, new SourceFile(fileComponent) } };
+     }
 
     private void AddTestFiles(ITestProjectsInfo testProjectsInfo)
     {

src/Stryker.Core/Stryker.Core/Reporters/Json/SourceFiles/SourceFile.cs

@@ -17,6 +17,8 @@ public class SourceFile : ISourceFile
 
     public SourceFile() { }
 
+    public static SourceFile Ignored => new() { Source = "File ignored by mutate filter", Language = "none", Mutants = new HashSet<IJsonMutant>() };
+
     public SourceFile(IReadOnlyFileLeaf file, ILogger logger = null)
     {
         logger ??= ApplicationLogging.LoggerFactory.CreateLogger<SourceFile>();