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# -*- coding: utf-8 -*-
# Copyright (c) 2013, Serge van Ginderachter <serge@vanginderachter.be>
# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
name: flattened
author: Serge van Ginderachter (!UNKNOWN) <serge@vanginderachter.be>
short_description: return single list completely flattened
description:
- Given one or more lists, this lookup will flatten any list elements found recursively until only 1 list is left.
options:
_terms:
description: lists to flatten
type: list
elements: raw
required: true
notes:
- Unlike the P(ansible.builtin.items#lookup) lookup which only flattens 1 level,
this plugin will continue to flatten until it cannot find lists anymore.
- Aka highlander plugin, there can only be one (list).
'''
EXAMPLES = """
- name: "'unnest' all elements into single list"
ansible.builtin.debug:
msg: "all in one list {{lookup('community.general.flattened', [1,2,3,[5,6]], ['a','b','c'], [[5,6,1,3], [34,'a','b','c']])}}"
"""
RETURN = """
_raw:
description:
- flattened list
type: list
"""
from ansible.errors import AnsibleError
from ansible.module_utils.six import string_types
from ansible.plugins.lookup import LookupBase
from ansible.utils.listify import listify_lookup_plugin_terms
class LookupModule(LookupBase):
def _check_list_of_one_list(self, term):
# make sure term is not a list of one (list of one..) item
# return the final non list item if so
if isinstance(term, list) and len(term) == 1:
term = term[0]
if isinstance(term, list):
term = self._check_list_of_one_list(term)
return term
def _do_flatten(self, terms, variables):
ret = []
for term in terms:
term = self._check_list_of_one_list(term)
if term == 'None' or term == 'null':
# ignore undefined items
break
if isinstance(term, string_types):
# convert a variable to a list
try:
term2 = listify_lookup_plugin_terms(term, templar=self._templar)
except TypeError:
# The loader argument is deprecated in ansible-core 2.14+. Fall back to
# pre-2.14 behavior for older ansible-core versions.
term2 = listify_lookup_plugin_terms(term, templar=self._templar, loader=self._loader)
# but avoid converting a plain string to a list of one string
if term2 != [term]:
term = term2
if isinstance(term, list):
# if it's a list, check recursively for items that are a list
term = self._do_flatten(term, variables)
ret.extend(term)
else:
ret.append(term)
return ret
def run(self, terms, variables=None, **kwargs):
if not isinstance(terms, list):
raise AnsibleError("with_flattened expects a list")
self.set_options(var_options=variables, direct=kwargs)
return self._do_flatten(terms, variables)
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