src/goDebugFactory,src/goDebug: only add --log-output flag if --log is set

In order to enable logging, debug users can set "showLog": true and
specify the output with "logOutput". These map directly to the delve
flags "--log" and "--log-output". If "--log-output" is passed without
"--log" delve complains. This means that users always have to remove
"--log-output" if they want to disable logging. This change only
passes the "--log-output" to delve if "showLog": true. This allows
users to disable logging by simply setting "showLog": false.

Change-Id: Ic568fbebe6b5ab07b2b5b2e60b6c68659cd67430
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/335029
Trust: Suzy Mueller <[email protected]>
Run-TryBot: Suzy Mueller <[email protected]>
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>

Author: suzmue

src/debugAdapter/goDebug.ts

@@ -639,9 +639,11 @@ export class Delve {
 
 				if (launchArgs.showLog) {
 					dlvArgs.push('--log=' + launchArgs.showLog.toString());
-				}
-				if (launchArgs.logOutput) {
-					dlvArgs.push('--log-output=' + launchArgs.logOutput);
+					// Only add the log output flag if we have already added the log flag.
+					// Otherwise, delve complains.
+					if (launchArgs.logOutput) {
+						dlvArgs.push('--log-output=' + launchArgs.logOutput);
+					}
 				}
 				if (launchArgs.cwd) {
 					dlvArgs.push('--wd=' + launchArgs.cwd);

src/goDebugFactory.ts

@@ -379,9 +379,11 @@ function spawnDlvDapServerProcess(
 	dlvArgs.push(`--listen=${host}:${port}`);
 	if (launchAttachArgs.showLog) {
 		dlvArgs.push('--log=' + launchAttachArgs.showLog.toString());
-	}
-	if (launchAttachArgs.logOutput) {
-		dlvArgs.push('--log-output=' + launchAttachArgs.logOutput);
+		// Only add the log output flag if we have already added the log flag.
+		// Otherwise, delve complains.
+		if (launchAttachArgs.logOutput) {
+			dlvArgs.push('--log-output=' + launchAttachArgs.logOutput);
+		}
 	}
 
 	const onWindows = process.platform === 'win32';

test/integration/goDebug.test.ts

@@ -654,6 +654,22 @@ const testAll = (ctx: Mocha.Context, isDlvDap: boolean) => {
 			throw new Error('does not report error on invalid delve flag');
 		});
 
+		test('should run program with showLog=false and logOutput specified', async () => {
+			const PROGRAM = path.join(DATA_ROOT, 'baseTest');
+
+			const config = {
+				name: 'Launch',
+				type: 'go',
+				request: 'launch',
+				mode: 'debug',
+				program: PROGRAM,
+				showLog: false,
+				logOutput: 'dap'
+			};
+			const debugConfig = await initializeDebugConfig(config, true);
+			await Promise.all([dc.configurationSequence(), dc.launch(debugConfig), dc.waitForEvent('terminated')]);
+		});
+
 		test('should handle threads request after initialization', async () => {
 			const PROGRAM = path.join(DATA_ROOT, 'baseTest');
 
@@ -2068,13 +2084,15 @@ const testAll = (ctx: Mocha.Context, isDlvDap: boolean) => {
 	});
 
 	let testNumber = 0;
-	async function initializeDebugConfig(config: DebugConfiguration) {
+	async function initializeDebugConfig(config: DebugConfiguration, keepUserLog?: boolean) {
 		if (isDlvDap) {
 			config['debugAdapter'] = 'dlv-dap';
-			// Log the output for easier test debugging.
-			config['logOutput'] = 'dap,debugger';
-			config['showLog'] = true;
-			config['trace'] = 'verbose';
+			if (!keepUserLog) {
+				// Log the output for easier test debugging.
+				config['logOutput'] = 'dap,debugger';
+				config['showLog'] = true;
+				config['trace'] = 'verbose';
+			}
 		} else {
 			config['debugAdapter'] = 'legacy';
 			// be explicit and prevent resolveDebugConfiguration from picking