Fix #5238 Notebooks should support relative links (#6289)

* Fix #5238 Notebooks should support relative links
- Added detection of relative #links inside notebooks
- Added handling of these, at least for current notebook

Not handled: open other notebook & scroll to position.

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

@@ -90,6 +90,12 @@ export interface INotebookService {
 	 */
 	serializeNotebookStateChange(notebookUri: URI, changeType: NotebookChangeType): void;
 
+	/**
+	 *
+	 * @param notebookUri URI of the notebook to navigate to
+	 * @param sectionId ID of the section to navigate to
+	 */
+	navigateTo(notebookUri: URI, sectionId: string): void;
 }
 
 export interface INotebookProvider {
@@ -117,6 +123,15 @@ export interface INotebookParams extends IBootstrapParams {
 	modelFactory?: ModelFactory;
 }
 
+/**
+ * Defines a section in a notebook as the header text for that section,
+ * the relative URI that can be used to link to it inside Notebook documents
+ */
+export interface INotebookSection {
+	header: string;
+	relativeUri: string;
+}
+
 export interface INotebookEditor {
 	readonly notebookParams: INotebookParams;
 	readonly id: string;
@@ -131,4 +146,6 @@ export interface INotebookEditor {
 	runAllCells(startCell?: ICellModel, endCell?: ICellModel): Promise<boolean>;
 	clearOutput(cell: ICellModel): Promise<boolean>;
 	clearAllOutputs(): Promise<boolean>;
+	getSections(): INotebookSection[];
+	navigateToSection(sectionId: string): void;
 }

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

@@ -619,4 +619,11 @@ export class NotebookService extends Disposable implements INotebookService {
 			}
 		}
 	}
+
+	navigateTo(notebookUri: URI, sectionId: string): void {
+		let editor = this._editors.get(notebookUri.toString());
+		if (editor) {
+			editor.navigateToSection(sectionId);
+		}
+	}
 }