Function foregroundMainSessionTask

src/tasks/LocalMainSessionTask.ts:270–302

(
  taskId: string,
  setAppState: SetAppState,
)

 * Returns the task's accumulated messages, or undefined if task not found.
 */
export function foregroundMainSessionTask(
  taskId: string,
  setAppState: SetAppState,
): Message[] | undefined {
  let taskMessages: Message[] | undefined

  setAppState(prev => {
    const task = prev.tasks[taskId]
    if (!task || task.type !== 'local_agent') {
      return prev
    }

    taskMessages = (task as LocalMainSessionTaskState).messages

    // Restore previous foregrounded task to background if it exists
    const prevId = prev.foregroundedTaskId
    const prevTask = prevId ? prev.tasks[prevId] : undefined
    const restorePrev =
      prevId && prevId !== taskId && prevTask?.type === 'local_agent'

    return {
      ...prev,
      foregroundedTaskId: taskId,
      tasks: {
        ...prev.tasks,
        ...(restorePrev && { [prevId]: { ...prevTask, isBackgrounded: true } }),
        [taskId]: { ...task, isBackgrounded: false },
      },
    }
  })

  return taskMessages
}

/**
 * Check if a task is a main session task (vs a regular agent task).