Ansible module to list groups in inventory (AWK version :D).

#!/bin/bash
#10 minutes Ansible module to list groups in inventory (AWK version) :D
#You can see outupt of script like "JSON Pretty Print" outside Ansible by using:
#./listgroups | python -m json.tool 

awk 'BEGIN {ORS=" ";};
     /^\[/{gsub("[\[\]]",""); groups_number++; groups_array[groups_number]=$0};
     END {
       print "{\"Inventory Groups\": [";
       for (group_in_array = 1; group_in_array <= groups_number-1; group_in_array++) printf "\"%s\", ",groups_array[group_in_array];
       printf "\"%s\"",groups_array[groups_number];
       print "]}"
     }' /etc/ansible/hosts