How to specify ansible pretasks for a role?

I use the pre_tasks to do some tasks before roles, thanks for Kashyap.

#!/usr/bin/env ansible-playbook

---
- hosts: all
  become: true
  pre_tasks:
    - name: start tasks and sent notifiaction to HipChat
      hipchat:
        color: purple
        token: "{{ hipchat_token }}"
        room: "{{ hipchat_room }}"
        msg: "[Start] Run 'foo/setup.yml' playbook on {{ ansible_nodename }}."

  roles:
    - chusiang.vim-and-vi-mode

  vars:
    ...

  tasks:
    - name: include main task
      include: tasks/main.yml

  post_tasks:
    - name: finish tasks and sent notifiaction to HipChat
      hipchat:
        color: green
        token: "{{ hipchat_token }}"
        room: "{{ hipchat_room }}"
        msg: "[Finish] Run 'foo/setup.yml' playbook on {{ ansible_nodename }}."

# vim:ft=ansible :