Add setting for default dacpac save location (#13194)

* add setting for default save location

* lowercase

* addressing comments

extensions/dacpac/src/wizard/common/constants.ts

@@ -0,0 +1,7 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+export const dacFxConfigurationKey = 'dacFx';
+export const dacFxSaveLocationKey = 'defaultSaveLocation';

extensions/dacpac/src/wizard/common/fileLocationHelper.ts

@@ -0,0 +1,30 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as constants from '../common/constants';
+
+/**
+ * Returns the default location to save a dacpac or bacpac
+ */
+export function defaultSaveLocation(): string {
+	return dacFxSaveLocationSettingIsValid() ? dacFxSaveLocationSetting() : os.homedir();
+}
+
+/**
+ * Returns the workspace setting on the default location to save dacpacs and bacpacs
+ */
+function dacFxSaveLocationSetting(): string {
+	return vscode.workspace.getConfiguration(constants.dacFxConfigurationKey)[constants.dacFxSaveLocationKey];
+}
+
+/**
+ * Returns if the default save location for dacpacs and bacpacs setting exists and is a valid path
+ */
+function dacFxSaveLocationSettingIsValid(): boolean {
+	return dacFxSaveLocationSetting() && dacFxSaveLocationSetting().trim() !== '' && fs.existsSync(dacFxSaveLocationSetting());
+}