Add the accumulate filter

- Add myself as a maintainer for it.
- Some integration tests.

.github/BOTMETA.yml

@@ -135,6 +135,8 @@ files:
   $doc_fragments/xenserver.py:
     labels: xenserver
     maintainers: bvitnik
+  $filters/accumulate.py:
+    maintainers: VannTen
   $filters/counter.py:
     maintainers: keilr
   $filters/crc32.py:

plugins/filter/accumulate.py

@@ -0,0 +1,49 @@
+# Copyright: Max Gautier <[email protected]>
+# 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
+
+DOCUMENTATION = '''
+  name: accumulate
+  short_description: Produce a list of accumulated sums of the input list contents.
+  version_added: 10.0.0
+  author: Max Gautier (@VannTen)
+  description:
+    - Passthrough to L(python itertools.accumulate function,https://docs.python.org/3/library/itertools.html#itertools.accumulate).
+    - Transforms an input list into the cumulative list of results from applying addition to the elements of the input list.
+    - Addition means the default python implementation of '+' for input list elements type.
+  options:
+    _input:
+      description: A list
+      type: list
+      elements: any
+      required: true
+'''
+
+RETURN = '''
+  _value:
+    description: A list of cumulated sums of the elements of the input list
+    type: list
+'''
+
+EXAMPLES = '''
+- name: Enumerate parent directories of some path
+  ansible.builtin.debug:
+    var: >
+       "/some/path/to/my/file"
+       | split('/') | map('split', '/')
+       | community.general.enumerate | map('join', '/')
+    # Produces: ['', '/some', '/some/path', '/some/path/to', '/some/path/to/my', '/some/path/to/my/file']
+'''
+
+from itertools import accumulate
+
+def list_accumulate(sequence):
+    return accumulate(sequence)
+
+
+class FilterModule(object):
+
+    def filters(self):
+        return {
+            'accumulate': list_accumulate,
+        }

tests/integration/targets/filter_accumulate/tasks/main.yml

@@ -0,0 +1,13 @@
+---
+# Copyright (c), Max Gautier <[email protected]>
+# 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
+
+- name: "Test accumulate filter"
+  assert:
+    that:
+      - "['a', 'b'] | community.general.accumulate == ['a', 'ab']"
+      - "[1, 2, 3] | community.general.accumulate == [1, 3, 6]"
+      - "[['foo'],['bar'],['foobar']] | community.general.accumulate == [['foo'], ['foo', 'bar'], ['foo', 'bar', 'foobar']]"
+      - "'path/to/file' | split('/') | map('split', '/') | community.general.accumulate | map('join', '/') == ['path', 'path/to', 'path/to/file']"
+      - "[{'foo':1}, {'bar':2}] | map('dict2items') | community.general.accumulate | map('items2dict') == [{'foo':1}, {'foo':1, 'bar':2}]"