Taskfile.yaml

### The hosts block
- hosts: "{{ playbook_targets | default('localhost') }}"
  gather_facts: true
  become: true
  ### The vars block  
  vars:
    ANSIBLE_STDOUT_CALLBACK: community.general.yaml    
    var1: "This is value1"
    var2: value2
    var3: value3
    var4: |-
      This is a multi-line value
      of type string
    var5:
      - listvalue1
      - listvalue2
      - listvalue3
      - listvalue4
    var6:
      some_key:
        some_child_key: "do it"
    var7: $(echo some_value)
    var8: 8000
    dbhosts:
      - dbhost1
      - dbhost2
      - dbhost3
    webhosts:
      - webhost1
      - webhost2
      - webhost3
    ### Global Options Block
    globals:
      options:
          my_global_option:
            help: "This is my global option"
            short: -g
            long: --global
            var: some_global_variable        
    ### The commands block
    commands:
      run|doit:
        options:
          foo:
            help: "This is some foo option"
            short: -f
            long: --foo
            type: choice
            var: some_foo_variable
            required: True
            not_required_if: 
              - some_bar_variable
            options:
              - foo1
              - foo2
          bar:
            help: "This is some bar option"
            short: -b
            long: --bar 
            type: str
            var: some_bar_variable
            required: False
            required_if: 
              - hello
              - some_baz_variable
          baz:
            help: "This is some baz option"
            short: -z
            long: --baz
            type: str
            var: some_baz_variable
            required: False
            mutually_exclusive_with: 
              - some_bar_variable
              - some_foo_variable
          envvar:
            help: "The value for this argument can be derived from an Environmental Variable"
            short: -E
            long: --env-var
            type: str
            var: env_var
            env_var: SOME_ENVIRONMENT_VARIABLE
            env_var_show: True
          num:
            help: "This is a numeric argument"
            short: -n
            long: --number
            var: some_num_variable
            type: int
            required: False            
          targets:
            help: "Playbook targets"
            short: -t
            long: --targets
            type: str
            var: playbook_targets
            required: True
          multiple:
            help: |-
              This option can be specified multiple times
            short: -m
            long: --multiple
            type: str
            var: multiple_arg
            allow_multiple: True
          some_switch:
            help: |-
              This is some boolean option, behaves like Click's switches,
              holds the value of True if specified
              see: https://github.com/pallets/click
            short: -s
            long: --some-switch
            is_flag: true
            var: some_switch
            required: True
          say_hello:
            help: "Invoke the 'hello' embedded shell function"
            short: -hello
            long: --say-hello
            type: str
            var: hello
            is_flag: True
          say_goodbye:
            help: "Invoke the 'goodbye' embedded shell function"
            short: -goodbye
            long: --say-goodbye
            type: str
            var: goodbye
            is_flag: True
          hidden_option:
            help: "This is a hidden option"
            short: -O
            long: --hidden-option
            is_hidden: True
            type: str
            var: hidden
            is_flag: True            
          verbose:
            help: |-
              This is a sample paramter that supports counting, as with:
              -v, -vv, -vvv, which would evaluate to 1, 2, and 3, respectively
            short: -v
            allow_counting: True
            var: verbosity          
        ### The help message
        help:
          message: |
            Invoke the ${__command__} command 
          epilog: |
            This line will be displayed at the end of the help text message
          examples:
            - example1: |
                tasks $__command__
            - example2: |
                Usage example 2
        ### Embedded shell functions
        functions:
          hello:
            shell: bash
            help: Say hello
            source: |-
              echo Hello! The value for var1 is $var1
          goodbye:
            shell: bash
            help: Say goodbye
            source: |-
              echo The value for var1 is $var1. Goodbye!
    ### Inventory expression
    inventory_expression: |
      [local]
      localhost ansible_connection=local
      [web_hosts]
      $(echo -e "${webhosts}" | jq -r '.[]')
      [db_hosts]
      $(echo -e "${dbhosts}"  | jq -r '.[]')
      [myhosts:children]
      web_hosts
      db_hosts            
  tasks:

    - name: Show Variables
      debug:
        msg: |-
          {{ hostvars[inventory_hostname] | to_nice_json }}