main.yml

---
- hosts: localhost
  gather_facts: false
  connection: local

  vars:
    requirements_file_path: ../requirements.yml
    requirements_file_backup: true

    # Don't touch this variable. It's for the updated requirements list.
    requirements_updated: []

  tasks:
    - name: Get all requirements from the requirements file.
      include_vars:
        file: "{{ requirements_file_path }}"
        name: requirements

    - name: Debug existing requirements list.
      debug:
        var: requirements
        verbosity: 2

    - include_tasks: tasks/update-requirement.yml
      loop: "{{ requirements.roles }}"
      loop_control:
        loop_var: role_info

    - name: Debug updated requirement list.
      debug:
        var: requirements_updated
        verbosity: 2

    - name: Write the updated requirements.yml file.
      copy:
        content: |
          ---
          roles:
            {{ requirements_updated | to_nice_yaml(indent=2) | trim | indent(2) }}
        dest: "{{ requirements_file_path }}"
        backup: "{{ requirements_file_backup }}"