chore(playground): codelens for active connection will inform about default connected database VSCODE-316

src/editors/activeConnectionCodeLensProvider.ts

@@ -3,6 +3,7 @@ import type { TextEditor } from 'vscode';
 import EXTENSION_COMMANDS from '../commands';
 import type ConnectionController from '../connectionController';
 import { isPlayground } from '../utils/playground';
+import { getDBFromConnectionString } from '../utils/connection-string-db';
 
 export default class ActiveConnectionCodeLensProvider
   implements vscode.CodeLensProvider
@@ -48,7 +49,14 @@ export default class ActiveConnectionCodeLensProvider
     if (this._connectionController.isConnecting()) {
       message = 'Connecting...';
     } else if (this._connectionController.getActiveDataService()) {
-      message = `Currently connected to ${this._connectionController.getActiveConnectionName()}. Click here to change connection.`;
+      const connectionString =
+        this._connectionController.getMongoClientConnectionOptions()?.url;
+      const defaultDB = connectionString
+        ? getDBFromConnectionString(connectionString)
+        : null;
+      message = defaultDB
+        ? `Currently connected to ${this._connectionController.getActiveConnectionName()} with default database ${defaultDB}. Click here to change connection.`
+        : `Currently connected to ${this._connectionController.getActiveConnectionName()}. Click here to change connection.`;
     } else {
       message = 'Disconnected. Click here to connect.';
     }

src/language/mongoDBService.ts

@@ -35,10 +35,11 @@ import type {
 } from '../types/playgroundType';
 import type { ClearCompletionsCache } from '../types/completionsCache';
 import { Visitor } from './visitor';
-import type { CompletionState } from './visitor';
+import type { CompletionState, NamespaceState } from './visitor';
 import LINKS from '../utils/links';
 
 import DIAGNOSTIC_CODES from './diagnosticCodes';
+import { getDBFromConnectionString } from '../utils/connection-string-db';
 
 const PROJECT = '$project';
 
@@ -445,6 +446,25 @@ export default class MongoDBService {
     return /^(?![0-9])[a-zA-Z0-9$_]+$/.test(str);
   }
 
+  /**
+   * @param state The state returned from Visitor.
+   * @returns The state with the default connected database, if available, if
+   * and only if the state returned from visitor does not already mention a
+   * database
+   */
+  withDefaultDatabase<T extends NamespaceState | CompletionState>(state: T): T {
+    const defaultDB = this.connectionString
+      ? getDBFromConnectionString(this.connectionString)
+      : null;
+    if (state.databaseName === null && defaultDB !== null) {
+      return {
+        ...state,
+        databaseName: defaultDB,
+      };
+    }
+    return state;
+  }
+
   /**
    * Parse code from a playground to identify
    * a context in which export to language action is being called.
@@ -473,7 +493,9 @@ export default class MongoDBService {
     params: PlaygroundTextAndSelection
   ): ExportToLanguageNamespace {
     try {
-      const state = this._visitor.parseASTForNamespace(params);
+      const state = this.withDefaultDatabase(
+        this._visitor.parseASTForNamespace(params)
+      );
       return {
         databaseName: state.databaseName,
         collectionName: state.collectionName,
@@ -917,9 +939,8 @@ export default class MongoDBService {
       `Provide completion items for a position: ${util.inspect(position)}`
     );
 
-    const state = this._visitor.parseASTForCompletion(
-      document?.getText(),
-      position
+    const state = this.withDefaultDatabase(
+      this._visitor.parseASTForCompletion(document?.getText(), position)
     );
     this._connection.console.log(
       `VISITOR completion state: ${util.inspect(state)}`

src/test/suite/editors/activeConnectionCodeLensProvider.test.ts

@@ -10,6 +10,7 @@ import { StatusView } from '../../../views';
 import { StorageController } from '../../../storage';
 import { ExtensionContextStub } from '../stubs';
 import TelemetryService from '../../../telemetry/telemetryService';
+import { TEST_DATABASE_URI } from '../dbTestHelper';
 
 const expect = chai.expect;
 
@@ -100,6 +101,13 @@ suite('Active Connection CodeLens Provider Test Suite', () => {
       });
 
       test('show active connection in code lenses', () => {
+        sandbox.replace(
+          testConnectionController,
+          'getMongoClientConnectionOptions',
+          sandbox.fake.returns({
+            url: TEST_DATABASE_URI,
+          })
+        );
         const codeLens = testCodeLensProvider.provideCodeLenses();
 
         expect(codeLens).to.be.an('array');
@@ -113,6 +121,27 @@ suite('Active Connection CodeLens Provider Test Suite', () => {
           'mdb.changeActiveConnection'
         );
       });
+
+      test('show active connection and default database in code lenses, when connected to a default database', () => {
+        sandbox.replace(
+          testConnectionController,
+          'getMongoClientConnectionOptions',
+          sandbox.fake.returns({
+            url: `${TEST_DATABASE_URI}/fakeDBName`,
+          })
+        );
+        const codeLens = testCodeLensProvider.provideCodeLenses();
+        expect(codeLens).to.be.an('array');
+        expect(codeLens.length).to.be.equal(1);
+        expect(codeLens[0].command?.title).to.be.equal(
+          'Currently connected to fakeName with default database fakeDBName. Click here to change connection.'
+        );
+        expect(codeLens[0].range.start.line).to.be.equal(0);
+        expect(codeLens[0].range.end.line).to.be.equal(0);
+        expect(codeLens[0].command?.command).to.be.equal(
+          'mdb.changeActiveConnection'
+        );
+      });
     });
   });