@@ -1744,7 +1744,7 @@ export class DefaultClient implements Client {
17441744 languageClient = new LanguageClient ( `cpptools` , serverOptions , clientOptions ) ;
17451745 languageClient . onNotification ( DebugProtocolNotification , logDebugProtocol ) ;
17461746 languageClient . onNotification ( DebugLogNotification , logLocalized ) ;
1747- languageClient . onNotification ( LogTelemetryNotification , ( e ) => this . logTelemetry ( e ) ) ;
1747+ languageClient . onNotification ( LogTelemetryNotification , ( e ) => void this . logTelemetry ( e ) ) ;
17481748 languageClient . onNotification ( ShowMessageWindowNotification , showMessageWindow ) ;
17491749 languageClient . registerProposedFeatures ( ) ;
17501750 await languageClient . start ( ) ;
@@ -2778,10 +2778,38 @@ export class DefaultClient implements Client {
27782778 }
27792779 }
27802780
2781- private logTelemetry ( notificationBody : TelemetryPayload ) : void {
2781+ private excessiveFilesWarningShown : boolean = false ;
2782+ private async logTelemetry ( notificationBody : TelemetryPayload ) : Promise < void > {
27822783 if ( notificationBody . event === "includeSquiggles" && this . configurationProvider && notificationBody . properties ) {
27832784 notificationBody . properties [ "providerId" ] = this . configurationProvider ;
27842785 }
2786+ 2787+ const showExcessiveFilesWarning = new PersistentWorkspaceState < boolean > ( 'CPP.showExcessiveFilesWarning' , true ) ;
2788+ if ( ! this . excessiveFilesWarningShown && showExcessiveFilesWarning . Value && notificationBody . event === 'ParsingStats' ) {
2789+ const filesDiscovered = notificationBody . metrics ?. filesDiscovered ?? 0 ;
2790+ const parsableFiles = notificationBody . metrics ?. parsableFiles ?? 0 ;
2791+ if ( filesDiscovered > 250000 || parsableFiles > 100000 ) {
2792+ // According to telemetry, less than 3% of workspaces have this many files so it seems like a reasonable threshold.
2793+ 2794+ const message = localize (
2795+ "parsing.stats.large.project" ,
2796+ 'Enumerated {0} files with {1} C/C++ source files detected. You may want to consider excluding some files for better performance.' ,
2797+ filesDiscovered ,
2798+ parsableFiles ) ;
2799+ const learnMore = localize ( 'learn.more' , 'Learn More' ) ;
2800+ const dontShowAgain = localize ( 'dont.show.again' , 'Don\'t Show Again' ) ;
2801+ 2802+ // We only want to show this once per session.
2803+ this . excessiveFilesWarningShown = true ;
2804+ const response = await vscode . window . showInformationMessage ( message , learnMore , dontShowAgain ) ;
2805+ 2806+ if ( response === dontShowAgain ) {
2807+ showExcessiveFilesWarning . Value = false ;
2808+ } else if ( response === learnMore ) {
2809+ void vscode . commands . executeCommand ( 'vscode.open' , vscode . Uri . parse ( 'https://go.microsoft.com/fwlink/?linkid=2333292' ) ) ;
2810+ }
2811+ }
2812+ }
27852813 telemetry . logLanguageServerEvent ( notificationBody . event , notificationBody . properties , notificationBody . metrics ) ;
27862814 }
27872815
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