First cut of #23752: Task dialog switches to output view

src/vs/workbench/parts/tasks/common/taskSystem.ts

@@ -100,6 +100,7 @@ export interface ITaskResolver {
 
 export interface ITaskSystem extends IEventEmitter {
 	run(task: Task, resolver: ITaskResolver): ITaskExecuteResult;
+	show(task: Task, forceFocus?: boolean): void;
 	isActive(): TPromise<boolean>;
 	isActiveSync(): boolean;
 	getActiveTasks(): Task[];

src/vs/workbench/parts/tasks/electron-browser/task.contribution.ts

@@ -444,6 +444,9 @@ class NullTaskSystem extends EventEmitter implements ITaskSystem {
 			promise: TPromise.as<ITaskSummary>({})
 		};
 	}
+	public show(task: Task, forceFocus: boolean = false): void {
+		return;
+	}
 	public isActive(): TPromise<boolean> {
 		return TPromise.as(false);
 	}
@@ -929,8 +932,13 @@ class TaskService extends EventEmitter implements ITaskService {
 				let executeResult = this.getTaskSystem().run(task, resolver);
 				if (executeResult.kind === TaskExecuteKind.Active) {
 					let active = executeResult.active;
-					if (active.same && active.background) {
-						this.messageService.show(Severity.Info, nls.localize('TaskSystem.activeSame', 'The task is already active and in watch mode. To terminate the task use `F1 > terminate task`'));
+					if (active.same) {
+						if (active.background) {
+							this.messageService.show(Severity.Info, nls.localize('TaskSystem.activeSame.background', 'The task is already active and in background mode. To terminate the task use `F1 > terminate task`'));
+						} else {
+							this.getTaskSystem().show(task, true);
+							// this.messageService.show(Severity.Info, nls.localize('TaskSystem.activeSame.noBackground', 'The task is already active. To terminate the task use `F1 > terminate task`'));
+						}
 					} else {
 						throw new TaskError(Severity.Warning, nls.localize('TaskSystem.active', 'There is already a task running. Terminate it first before executing another task.'), TaskErrors.RunningTask);
 					}

src/vs/workbench/parts/tasks/electron-browser/terminalTaskSystem.ts

@@ -156,6 +156,15 @@ export class TerminalTaskSystem extends EventEmitter implements ITaskSystem {
 		}
 	}
 
+	public show(task: Task, forceFocus: boolean = false): void {
+		let terminalData = this.activeTasks[task._id];
+		if (terminalData === void 0) {
+			return;
+		}
+		this.terminalService.setActiveInstance(terminalData.terminal);
+		this.terminalService.showPanel(forceFocus);
+	}
+
 	public isActive(): TPromise<boolean> {
 		return TPromise.as(this.isActiveSync());
 	}

src/vs/workbench/parts/tasks/node/processTaskSystem.ts

@@ -89,6 +89,10 @@ export class ProcessTaskSystem extends EventEmitter implements ITaskSystem {
 		return this.executeTask(task);
 	}
 
+	public show(task: Task, forceFocus: boolean = false): void {
+		this.outputChannel.show(!focus);
+	}
+
 	public hasErrors(value: boolean): void {
 		this.errorsShown = !value;
 	}