#cpp chat variable

Extension/package.json

@@ -38,7 +38,9 @@
         "Snippets"
     ],
     "enabledApiProposals": [
-        "terminalDataWriteEvent"
+        "terminalDataWriteEvent",
+        "chatParticipant",
+        "chatVariableResolver"
     ],
     "capabilities": {
         "untrustedWorkspaces": {

Extension/src/LanguageServer/client.ts

@@ -536,6 +536,14 @@ interface DidChangeActiveEditorParams {
     selection?: Range;
 }
 
+export interface ChatContextResult {
+    language: string;
+    standardVersion: string;
+    compiler: string;
+    targetPlatform: string;
+    targetArchitecture: string;
+}
+
 // Requests
 const InitializationRequest: RequestType<CppInitializationParams, string, void> = new RequestType<CppInitializationParams, string, void>('cpptools/initialize');
 const QueryCompilerDefaultsRequest: RequestType<QueryDefaultCompilerParams, configs.CompilerDefaults, void> = new RequestType<QueryDefaultCompilerParams, configs.CompilerDefaults, void>('cpptools/queryCompilerDefaults');
@@ -553,6 +561,7 @@ const ExtractToFunctionRequest: RequestType<ExtractToFunctionParams, WorkspaceEd
 const GoToDirectiveInGroupRequest: RequestType<GoToDirectiveInGroupParams, Position | undefined, void> = new RequestType<GoToDirectiveInGroupParams, Position | undefined, void>('cpptools/goToDirectiveInGroup');
 const GenerateDoxygenCommentRequest: RequestType<GenerateDoxygenCommentParams, GenerateDoxygenCommentResult | undefined, void> = new RequestType<GenerateDoxygenCommentParams, GenerateDoxygenCommentResult, void>('cpptools/generateDoxygenComment');
 const ChangeCppPropertiesRequest: RequestType<CppPropertiesParams, void, void> = new RequestType<CppPropertiesParams, void, void>('cpptools/didChangeCppProperties');
+const CppContextRequest: RequestType<void, ChatContextResult, void> = new RequestType<void, ChatContextResult, void>('cpptools/getChatContext');
 
 // Notifications to the server
 const DidOpenNotification: NotificationType<DidOpenTextDocumentParams> = new NotificationType<DidOpenTextDocumentParams>('textDocument/didOpen');
@@ -778,6 +787,7 @@ export interface Client {
     getShowConfigureIntelliSenseButton(): boolean;
     setShowConfigureIntelliSenseButton(show: boolean): void;
     addTrustedCompiler(path: string): Promise<void>;
+    getChatContext(): Promise<ChatContextResult | undefined>;
 }
 
 export function createClient(workspaceFolder?: vscode.WorkspaceFolder): Client {
@@ -2187,6 +2197,11 @@ export class DefaultClient implements Client {
         await this.languageClient.sendNotification(DidOpenNotification, params);
     }
 
+    public async getChatContext(): Promise<ChatContextResult | undefined> {
+        await this.ready;
+        return this.languageClient.sendRequest(CppContextRequest, null);
+    }
+
     /**
      * a Promise that can be awaited to know when it's ok to proceed.
      *
@@ -4007,4 +4022,5 @@ class NullClient implements Client {
     getShowConfigureIntelliSenseButton(): boolean { return false; }
     setShowConfigureIntelliSenseButton(show: boolean): void { }
     addTrustedCompiler(path: string): Promise<void> { return Promise.resolve(); }
+    getChatContext(): Promise<ChatContextResult> { return Promise.resolve({} as ChatContextResult); }
 }

Extension/src/LanguageServer/extension.ts

@@ -19,7 +19,7 @@ import { logAndReturn } from '../Utility/Async/returns';
 import * as util from '../common';
 import { PlatformInformation } from '../platform';
 import * as telemetry from '../telemetry';
-import { Client, DefaultClient, DoxygenCodeActionCommandArguments, openFileVersions } from './client';
+import { ChatContextResult, Client, DefaultClient, DoxygenCodeActionCommandArguments, openFileVersions } from './client';
 import { ClientCollection } from './clientCollection';
 import { CodeActionDiagnosticInfo, CodeAnalysisDiagnosticIdentifiersAndUri, codeAnalysisAllFixes, codeAnalysisCodeToFixes, codeAnalysisFileToCodeActions } from './codeAnalysis';
 import { CppBuildTaskProvider } from './cppBuildTaskProvider';
@@ -246,6 +246,78 @@ export async function activate(): Promise<void> {
         clients.timeTelemetryCollector.setFirstFile(activeEditor.document.uri);
         activeDocument = activeEditor.document;
     }
+
+    await setupCppChatVariable(util.extensionContext);
+}
+
+export async function setupCppChatVariable(context: vscode.ExtensionContext | undefined): Promise<void>
+{
+    if (!context) {
+        return;
+    }
+
+    vscode.chat.registerChatVariableResolver('cpp',
+        `Describes the the C++ language features that can be used according
+ to the following information: the C++ language standard version, the target architecture and target operating system.`, {
+            resolve: async (name, _context, _token) => {
+                function fixUpLanguage(languageId: string) {
+                    const languageIdToLanguage: { [id: string]: string } =
+                    { 'c': 'C', 'cpp': 'C++', 'cuda-cpp': 'CUDA C++' };
+                    return languageIdToLanguage[languageId] || languageId;
+                }
+
+                function fixUpCompiler(compilerId: string) {
+                    const compilerIdToCompiler: { [id: string]: string } =
+                    { 'msvc': 'MSVC', 'clang': 'Clang', 'gcc': 'GCC' };
+                    return compilerIdToCompiler[compilerId] || compilerId;
+                }
+
+                function fixUpStandardVersion(stdVerId: string) {
+                    const stdVerIdToStdVer: { [id: string]: string } =
+                    { 'c++98': 'C++98', 'c++03': 'C++03', 'c++11': 'C++11', 'c++14': 'C++14', 'c++17': 'C++17',
+                        'c++20': 'C++20', 'c++23': 'C++23', 'c90' : "C90", 'c99': "C99", 'c11': "C11", 'c17': "C17",
+                        'c23': "C23" };
+                    return stdVerIdToStdVer[stdVerId] || stdVerId;
+                }
+
+                function fixTargetPlatform(targetPlatformId: string) {
+                    const platformIdToPlatform: { [id: string]: string } = { 'windows': 'Windows', 'Linux': 'Linux', 'macos': 'macOS' };
+                    return platformIdToPlatform[targetPlatformId] || targetPlatformId;
+                }
+
+                if (name !== 'cpp') {
+                    return undefined;
+                }
+
+                // Return undefined if the active document is not a C++/C/CUDA/Header file.
+                const currentDoc = vscode.window.activeTextEditor?.document;
+                if (!currentDoc || (!util.isCpp(currentDoc) && !util.isHeaderFile(currentDoc.uri))) {
+                    return undefined;
+                }
+
+                const chatContext: ChatContextResult | undefined = await getChatContext();
+                if (!chatContext) {
+                    return undefined;
+                }
+
+                telemetry.logCppChatVariableEvent('cpp',
+                    { "language": chatContext.language, "compiler": chatContext.compiler, "standardVersion": chatContext.standardVersion,
+                        "targetPlatform": chatContext.targetPlatform, "targetArchitecture": chatContext.targetArchitecture });
+
+                const language = fixUpLanguage(chatContext.language);
+                const compiler = fixUpCompiler(chatContext.compiler);
+                const standardVersion = fixUpStandardVersion(chatContext.standardVersion);
+                const targetPlatform = fixTargetPlatform(chatContext.targetPlatform);
+                const value = `I am working on a project of the following nature:
+- Using ${language}. Prefer a solution written in ${language} to any other language. Call out which language you are using in the answer.
+- Using the ${language} standard language version ${standardVersion}. Prefer solutions using the new and more recent features introduced in ${standardVersion}. Call out which standard version you are using in the answer.
+- Using the ${compiler} compiler. Prefer solutions supported by the ${compiler} compiler.
+- Targeting the ${targetPlatform} platform. Prefer solutions and API that are supported on ${targetPlatform}.
+- Targeting the ${chatContext.targetArchitecture} architecture. Prefer solutions and techniques that are supported on the ${chatContext.targetArchitecture} architecture.
+`;
+                return [ { level: vscode.ChatVariableLevel.Full, value: value } ];
+            }
+        });
 }
 
 export function updateLanguageConfigurations(): void {
@@ -1305,3 +1377,7 @@ export async function preReleaseCheck(): Promise<void> {
         }
     }
 }
+
+export async function getChatContext(): Promise<ChatContextResult | undefined> {
+    return clients?.ActiveClient?.getChatContext() ?? undefined;
+}

Extension/src/telemetry.ts

@@ -123,6 +123,20 @@ export function logLanguageServerEvent(eventName: string, properties?: Record<st
     sendTelemetry();
 }
 
+export function logCppChatVariableEvent(eventName: string, properties?: Record<string, string>, metrics?: Record<string, number>): void {
+    const sendTelemetry = () => {
+        if (experimentationTelemetry) {
+            const eventNamePrefix: string = "C_Cpp/Copilot/Chat/Variable/";
+            experimentationTelemetry.sendTelemetryEvent(eventNamePrefix + eventName, properties, metrics);
+        }
+    };
+
+    if (is.promise(initializationPromise)) {
+        return void initializationPromise.catch(logAndReturn.undefined).then(sendTelemetry).catch(logAndReturn.undefined);
+    }
+    sendTelemetry();
+}
+
 function getPackageInfo(): IPackageInfo {
     return {
         name: util.packageJson.publisher + "." + util.packageJson.name,