Hack Maven's ~/.m2/settings.xml to add a new profile and its properties.

hackMavenSettings.yml

# MVN IDEA settings
#
---
- hosts: all
  gather_facts: false
  roles:
    - cmprescott.xml
  vars:
    - m2_settings_file: ~/.m2/settings.xml
  tasks:
    - name: Make sure ~/.m2 exists
      file: path=~/.m2 state=directory mode=0755
    - name: Does {{ m2_settings_file }} exist?
      stat: path={{ m2_settings_file }}
      register: m2_settings
    - block:
      - debug:
          msg: 'WARNING: No {{ m2_settings_file }} exists.'
      - debug:
          msg: Generate one and try again.
      when: not m2_settings.stat.exists
    - block:
      - name: See if mvnidea profile already there
        xml:
          file: "{{ m2_settings_file }}"
          namespaces:
            mvn: http://maven.apache.org/SETTINGS/1.1.0
          xpath: /mvn:settings/mvn:profiles/mvn:profile[mvn:id = "mvnidea"]
          count: true
        register: mvnidea_profile_id
      - block:
        - name: Add child profile
          xml:
            pretty_print: true
            file: "{{ m2_settings_file }}"
            xpath: /mvn:settings/mvn:profiles
            namespaces:
              mvn: http://maven.apache.org/SETTINGS/1.1.0
            add_children:
              - profile: ''
        - name: Make this an "mvnidea" profile
          xml:
            pretty_print: true
            file: "{{ m2_settings_file }}"
            xpath: /mvn:settings/mvn:profiles/mvn:profile[last()]
            namespaces:
              mvn: http://maven.apache.org/SETTINGS/1.1.0
            add_children:
              - id: 'mvnidea'
              - properties: ''
        - name: Set up "mvnidea" profile properties
          xml:
            pretty_print: true
            file: "{{ m2_settings_file }}"
            xpath: /mvn:settings/mvn:profiles/mvn:profile[mvn:id = "mvnidea"]/mvn:properties
            namespaces:
              mvn: http://maven.apache.org/SETTINGS/1.1.0
            add_children:
              - 'mvnidea.compiler.noWarn': 'true'
              - 'mvnidea.compiler.deprecation': 'false'
              - 'mvnidea.compiler.parallel': 'true'
              - 'mvnidea.compiler.heapSizeMb': '4096'
              - 'mvnidea.maven.importAutomatically': 'false'
              - 'mvnidea.maven.updateMavenHome': 'true'
        when: mvnidea_profile_id.count == 0
      when: m2_settings.stat.exists