Generate-Documentation Check if file is excluded (#77353)

* check for excluded files

* remove unused usings

* fix indentation

Author: akhera99

src/EditorFeatures/Core/DocumentationComments/CopilotGenerateDocumentationCommentManager.cs

@@ -3,10 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.Collections.Generic;
 using System.ComponentModel.Composition;
-using System.Linq;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Copilot;
@@ -51,16 +48,16 @@ public void TriggerDocumentationCommentProposalGeneration(Document document,
 
         private async Task GenerateDocumentationCommentProposalsAsync(Document document, DocumentationCommentSnippet snippet, ITextSnapshot snapshot, VirtualSnapshotPoint caret, ITextView textView, CancellationToken cancellationToken)
         {
-            var generateDocumentationCommentProvider = await CreateProviderAsync(document, textView, cancellationToken).ConfigureAwait(false);
+            var generateDocumentationCommentProvider = await CreateProviderAsync(document, textView, snippet.MemberNode, cancellationToken).ConfigureAwait(false);
             if (generateDocumentationCommentProvider is not null)
             {
                 await generateDocumentationCommentProvider.GenerateDocumentationProposalAsync(snippet, snapshot, caret, cancellationToken).ConfigureAwait(false);
             }
         }
 
-        private async Task<CopilotGenerateDocumentationCommentProvider?> CreateProviderAsync(Document document, ITextView textView, CancellationToken cancellationToken)
+        private async Task<CopilotGenerateDocumentationCommentProvider?> CreateProviderAsync(Document document, ITextView textView, SyntaxNode? memberNode, CancellationToken cancellationToken)
         {
-            var copilotService = await IsGenerateDocumentationAvailableAsync(document, cancellationToken).ConfigureAwait(false);
+            var copilotService = await IsGenerateDocumentationAvailableAsync(document, memberNode, cancellationToken).ConfigureAwait(false);
 
             if (copilotService is null)
             {
@@ -75,7 +72,7 @@ private async Task GenerateDocumentationCommentProposalsAsync(Document document,
             return provider;
         }
 
-        private static async Task<ICopilotCodeAnalysisService?> IsGenerateDocumentationAvailableAsync(Document document, CancellationToken cancellationToken)
+        private static async Task<ICopilotCodeAnalysisService?> IsGenerateDocumentationAvailableAsync(Document document, SyntaxNode? memberNode, CancellationToken cancellationToken)
         {
             // Bailing out if copilot is not available or the option is not enabled.
             if (document.GetLanguageService<ICopilotOptionsService>() is not { } copilotOptionService ||
@@ -90,6 +87,17 @@ await copilotService.IsAvailableAsync(cancellationToken).ConfigureAwait(false) i
                 return null;
             }
 
+            if (memberNode is null)
+            {
+                return null;
+            }
+
+            // Check to see if the file containing the member being documented has been excluded.
+            if (await copilotService.IsFileExcludedAsync(memberNode.SyntaxTree.FilePath, cancellationToken).ConfigureAwait(false))
+            {
+                return null;
+            }
+
             return copilotService;
         }
     }

src/EditorFeatures/Core/DocumentationComments/CopilotGenerateDocumentationCommentProvider.cs

@@ -43,7 +43,7 @@ public async Task InitializeAsync(ITextView textView, SuggestionServiceBase sugg
         }
 
         public async Task GenerateDocumentationProposalAsync(DocumentationCommentSnippet snippet,
-        ITextSnapshot oldSnapshot, VirtualSnapshotPoint oldCaret, CancellationToken cancellationToken)
+            ITextSnapshot oldSnapshot, VirtualSnapshotPoint oldCaret, CancellationToken cancellationToken)
         {
             await Task.Yield().ConfigureAwait(false);
 
@@ -52,7 +52,8 @@ public async Task GenerateDocumentationProposalAsync(DocumentationCommentSnippet
                 return;
             }
 
-            var snippetProposal = GetSnippetProposal(snippet.SnippetText, snippet.MemberNode, snippet.Position, snippet.CaretOffset);
+            // MemberNode is not null at this point, checked when determining if the file is exluded.
+            var snippetProposal = GetSnippetProposal(snippet.SnippetText, snippet.MemberNode!, snippet.Position, snippet.CaretOffset);
 
             if (snippetProposal is null)
             {
@@ -80,13 +81,8 @@ public async Task GenerateDocumentationProposalAsync(DocumentationCommentSnippet
         /// <summary>
         /// Traverses the documentation comment shell and retrieves the pieces that are needed to generate the documentation comment.
         /// </summary>
-        private static DocumentationCommentProposal? GetSnippetProposal(string comments, SyntaxNode? memberNode, int? position, int caret)
+        private static DocumentationCommentProposal? GetSnippetProposal(string comments, SyntaxNode memberNode, int? position, int caret)
         {
-            if (memberNode is null)
-            {
-                return null;
-            }
-
             if (position is null)
             {
                 return null;