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85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
# (c) 2013, Serge van Ginderachter <serge@vanginderachter.be>
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# (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = """
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lookup: flattened
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author: Serge van Ginderachter <serge@vanginderachter.be>
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version_added: "1.3"
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short_description: return single list completely flattened
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description:
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- given one or more lists, this lookup will flatten any list elements found recursively until only 1 list is left.
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options:
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_terms:
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description: lists to flatten
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required: True
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notes:
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- unlike 'items' which only flattens 1 level, this plugin will continue to flatten until it cannot find lists anymore.
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- aka highlander plugin, there can only be one (list).
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"""
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EXAMPLES = """
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- name: "'unnest' all elements into single list"
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debug: msg="all in one list {{lookup('flattened', [1,2,3,[5,6]], [a,b,c], [[5,6,1,3], [34,a,b,c]])}}"
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"""
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RETURN = """
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_raw:
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description:
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- flattened list
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type: list
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"""
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from ansible.errors import AnsibleError
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from ansible.module_utils.six import string_types
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from ansible.plugins.lookup import LookupBase
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from ansible.utils.listify import listify_lookup_plugin_terms
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class LookupModule(LookupBase):
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def _check_list_of_one_list(self, term):
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# make sure term is not a list of one (list of one..) item
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# return the final non list item if so
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if isinstance(term, list) and len(term) == 1:
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term = term[0]
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if isinstance(term, list):
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term = self._check_list_of_one_list(term)
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return term
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def _do_flatten(self, terms, variables):
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ret = []
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for term in terms:
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term = self._check_list_of_one_list(term)
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if term == 'None' or term == 'null':
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# ignore undefined items
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break
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if isinstance(term, string_types):
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# convert a variable to a list
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term2 = listify_lookup_plugin_terms(term, templar=self._templar, loader=self._loader)
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# but avoid converting a plain string to a list of one string
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if term2 != [term]:
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term = term2
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if isinstance(term, list):
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# if it's a list, check recursively for items that are a list
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term = self._do_flatten(term, variables)
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ret.extend(term)
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else:
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ret.append(term)
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return ret
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def run(self, terms, variables, **kwargs):
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if not isinstance(terms, list):
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raise AnsibleError("with_flattened expects a list")
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return self._do_flatten(terms, variables)
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