refactor: Add accessor for Grouper objects in TaskGroups

Author: claremacrae

src/Query/TaskGroups.ts

@@ -33,6 +33,13 @@ export class TaskGroups {
         this.addTasks(taskGroupingTree);
     }
 
+    /**
+     * Return the {@link Grouper} objects, 1 per 'group by' line in the tasks query block.
+     */
+    public get groupers(): Grouper[] {
+        return this._groupers;
+    }
+
     /**
      * All the tasks matching the query, grouped together, and in the order
      * that they should be displayed.

tests/TaskGroups.test.ts

@@ -29,6 +29,7 @@ describe('Grouping tasks', () => {
         const groups = new TaskGroups(grouping, inputs);
 
         // Assert
+        expect(groups.groupers).toStrictEqual(grouping);
         expect(groups.toString()).toMatchInlineSnapshot(`
             "
             Group names: [file1]