Add language picker to notebook cells. (#18601)

src/sql/workbench/services/notebook/browser/models/cell.ts

@@ -418,6 +418,7 @@ export class CellModel extends Disposable implements ICellModel {
 		if (newLanguage !== this._language) {
 			this._language = newLanguage;
 			this._onLanguageChanged.fire(newLanguage);
+			this.sendChangeToNotebook(NotebookChangeType.CellMetadataUpdated);
 		}
 	}
 

src/sql/workbench/services/notebook/browser/notebookService.ts

@@ -76,6 +76,8 @@ export interface INotebookService {
 
 	getStandardKernelsForProvider(provider: string): Promise<azdata.nb.IStandardKernel[] | undefined>;
 
+	getSupportedLanguagesForProvider(provider: string, kernelDisplayName?: string): Promise<string[]>;
+
 	getOrCreateSerializationManager(providerId: string, uri: URI): Promise<ISerializationManager>;
 
 	getOrCreateExecuteManager(providerId: string, uri: URI): Thenable<IExecuteManager>;

src/sql/workbench/services/notebook/browser/notebookServiceImpl.ts

@@ -494,6 +494,22 @@ export class NotebookService extends Disposable implements INotebookService {
 		return kernels;
 	}
 
+	public async getSupportedLanguagesForProvider(provider: string, kernelDisplayName?: string): Promise<string[]> {
+		let languages: string[] = [];
+		let kernels = await this.getStandardKernelsForProvider(provider);
+		if (kernelDisplayName && kernels) {
+			kernels = kernels.filter(kernel => kernel.displayName === kernelDisplayName);
+		}
+		kernels?.forEach(kernel => {
+			if (kernel.supportedLanguages) {
+				languages.push(...kernel.supportedLanguages);
+			}
+		});
+		// Remove duplicates
+		languages = [...new Set(languages)];
+		return languages;
+	}
+
 	private shutdown(): void {
 		this._executeManagersMap.forEach(manager => {
 			manager.forEach(m => {