Silly example ansible dynamic inventory

ansible.cfg

[defaults]
inventory = ./inventory.pl

inventory.pl

#!/usr/bin/env perl

use warnings;
use strict;

print <<OUTPUT;
{
    "excluded" : ["someserver.example.com"],

    "_meta" : {
        "hostvars" : {
            "someserver.example.com": {}
        }
    }
}
OUTPUT

output.txt

$ ansible --list-hosts excluded
someserver.example.com
$