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# (c) 2013, Bradley Young <young.bradley@gmail.com>
# (c) 2012-17 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import annotations
DOCUMENTATION = """
name: together
author: Bradley Young (!UNKNOWN) <young.bradley@gmail.com>
version_added: '1.3'
short_description: merges lists into synchronized list
description:
- Creates a list with the iterated elements of the supplied lists
- "To clarify with an example, [ 'a', 'b' ] and [ 1, 2 ] turn into [ ('a',1), ('b', 2) ]"
- This is basically the same as the 'zip_longest' filter and Python function
- Any 'unbalanced' elements will be substituted with 'None'
options:
_terms:
description: list of lists to merge
required: True
"""
EXAMPLES = """
- name: item.0 returns from the 'a' list, item.1 returns from the '1' list
ansible.builtin.debug:
msg: "{{ item.0 }} and {{ item.1 }}"
with_together:
- ['a', 'b', 'c', 'd']
- [1, 2, 3, 4]
"""
RETURN = """
_list:
description: synchronized list
type: list
elements: list
"""
import itertools
from ansible.errors import AnsibleError
from ansible.plugins.lookup import LookupBase
class LookupModule(LookupBase):
"""
Transpose a list of arrays:
[1, 2, 3], [4, 5, 6] -> [1, 4], [2, 5], [3, 6]
Replace any empty spots in 2nd array with None:
[1, 2], [3] -> [1, 3], [2, None]
"""
def run(self, terms, variables=None, **kwargs):
my_list = terms[:]
if len(my_list) == 0:
raise AnsibleError("with_together requires at least one element in each list")
return [self._flatten(x) for x in itertools.zip_longest(*my_list, fillvalue=None)]
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