Generating sequences with coma seperated values - ansible

Question

I'm trying to achieve something similar like cisco range commandos with ansible. in my case, I have tried the following:
- name: test playbook
hosts: all
connection: local
gather_facts: no
vars:
epg: "{{ lookup('env','EPG').split(',') }}"
task:
- debug:
var:(item|int)
with_sequence_ "{{ epg }}"
the input will be made by the user and can be something like: 10-13,20
in this case what I want to have just like the cisco IOS console : 10,11,12,13,20
instead, I get the following output:
TASK [debug] *******************************************************************
task path: /opt2/jenkins/TEST/TEST interface.yaml:42
ok: [tst] => (item=10) => {
"(item|int)": "10",
"ansible_loop_var": "item",
"item": "10"
}
ok: [tst] => (item=11) => {
"(item|int)": "11",
"ansible_loop_var": "item",
"item": "11"
}
ok: [tst] => (item=12) => {
"(item|int)": "12",
"ansible_loop_var": "item",
"item": "12"
}
ok: [tst] => (item=13) => {
"(item|int)": "13",
"ansible_loop_var": "item",
"item": "13"
}
ok: [tst] => (item=1) => {
"(item|int)": "1",
"ansible_loop_var": "item",
"item": "1"
}
ok: [tst] => (item=2) => {
"(item|int)": "2",
"ansible_loop_var": "item",
"item": "2"
}
ok: [tst] => (item=3) => {
"(item|int)": "3",
"ansible_loop_var": "item",
"item": "3"
... (so on up to 20)
How can I get only 10,11,12,13 and 20 if somebody can help me I will be glad. Thank you in advance.

Answer 1

you have to combine a list of jinja2 and Ansible filters. It's not easy but try this:
- name: test playbook
hosts: all
vars:
epg: "{{ lookup('env','EPG')}}"
task:
- debug:
msg: "{% set LIST_EPG=[] %}{% for it in (epg.split(',')) %}{% set int1=it.split('-')[0] | int() %}{% if it.split('-') |length > 1 %}{% set int2=it.split('-')[1] | int() %}{% for i in range(int1, int2+1) %}{{ LIST_EPG.append(i|int) }}{% endfor %}{% endif %}{{ LIST_EPG.append(int1| int) }}{% endfor %}{{LIST_EPG|flatten|unique|join(',') }}"

Answer 2

By splitting the comma separated list in EPG environment variable, you are creating an array/list in epg. So we need to iterate over this.
Consider environment variable as:
export EPG="10,11,12,13,20"
And reusing your epg variable:
vars:
epg: "{{ lookup('env', 'EPG').split(',') }}"
tasks:
- debug:
msg: "{{ item }}"
loop: "{{ epg }}"
We can get this result:
ok: [localhost] => (item=10) => {
"msg": "10"
}
ok: [localhost] => (item=11) => {
"msg": "11"
}
ok: [localhost] => (item=12) => {
"msg": "12"
}
ok: [localhost] => (item=13) => {
"msg": "13"
}
ok: [localhost] => (item=20) => {
"msg": "20"
}