It doesn't help at all that googlegroups uses varying width fonts,
especially since whitespace is so important in both YAML and Python.
The docs, as far as I've found, never define what |to_nice_yaml|'s
|indent| parameter controls, but the experiment below shows it only
affects the indentation of mapping keys, with the first position in an
indentation being either a space or, if this is the first mapping of a
list, a dash. The other unfortunate side effect of |to_nice_yaml| is
that it sorts dictionary keys. Both |to_yaml| and |to_nice_yaml| are
wrappers around calls to |yaml.dump()| with slightly different
parameters. (Particularly, |default_flow_style| being |None| and
|False|, respectively, and |to_nice_yaml| having a default |indent| of
4, both of which you can override with either |to_yaml| or |to_nice_yaml|.)
The |indent| filter does not indent "the first attribute of the list
despite |first=false|." The whitespace you see in your output before |-
class| is the literal spaces before the |{{|.
Save the following as |indent.yml| and run
|ansible-playbook indent.yml && cat ./indent.yml|
to see exactly what "it only affects the indentation of mapping keys"
means. It's a lot more subtle than I expected.
|- name: Saving a list of dictionaries to a file gather_facts: false
hosts: - localhost tasks: - name: Saving a list of dictionaries to a
file vars: topvar: volumes: - class: 'data' id:
'a61b96e7-427e-493a-993c-c3efc8a16aa1' size: '500GB' type: 'ssd' dict:
dictd: dictd1: 1 dictd2: 2 dictc: - 111 - 222 - dictcdict: able: a
baker: b charlie: - c1 - c2 dictb: beta dicta: alpha copy: content: |
topvar_indent_2: {{ topvar | to_nice_yaml(indent=2) | indent(width=2,
first=true) }} topvar_no_indent_defaults_to_4: {{ topvar | to_nice_yaml(
) | indent(width=4, first=true) }} topvar_indent_8: {{ topvar |
to_nice_yaml(indent=4) | indent(width=8, first=true) }} dest:
"./indent_output.yml" |
The output is rather long, but I'll post it here to save you the trouble:
|topvar_indent_2: volumes: - class: data dict: dicta: alpha dictb: beta
dictc: - 111 - 222 - dictcdict: able: a baker: b charlie: - c1 - c2
dictd: dictd1: 1 dictd2: 2 id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB type: ssd topvar_no_indent_defaults_to_4: volumes: - class:
data dict: dicta: alpha dictb: beta dictc: - 111 - 222 - dictcdict:
able: a baker: b charlie: - c1 - c2 dictd: dictd1: 1 dictd2: 2 id:
a61b96e7-427e-493a-993c-c3efc8a16aa1 size: 500GB type: ssd
topvar_indent_8: volumes: - class: data dict: dicta: alpha dictb: beta
dictc: - 111 - 222 - dictcdict: able: a baker: b charlie: - c1 - c2
dictd: dictd1: 1 dictd2: 2 id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB type: ssd |
On 7/28/22 4:04 AM, jean-christophe manciot wrote:
@Todd Lewis
Thanks for pointing me to the right direction. :-)
Your suggestion is a bit too short:
volumes:
- class: data
id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB
type: ssd
Strangely, it indents the first attribute of the list despite
'first=false'.
With:
volumes:
{{ volumes | to_nice_yaml | indent(width=8, first=false) }}
we get a correct result:
volumes:
- class: data
id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB
type: ssd
which is close enough, although I don't understand why we can't get
the original expected result.
On Wednesday, July 27, 2022 at 8:02:19 PM UTC+2 [email protected] wrote:
You've misunderstoodwhat the indent parameter of |to_nice_yaml
does|.It doesn't shift everything to the right by that much.
Rather,it tells how much to indent those things which must be
indented,like dictionaries within dictionaries. You don't have any
so ithas no effect.
Use the |indent|filter instead.
|volumes:{{ volumes | to_nice_yaml() | indent(width=4, first=false) }}|
On 7/27/22 1:19 PM, jean-christophemanciot wrote:
The goal seems to be simple, but I cannot manage to get
theindentation right.
*Playbook*:
- name: Saving a list ofdictionaries to a file
gather_facts: false
hosts:
- localhost
strategy: debug
tasks:
- name: Saving a list of dictionaries to a file
vars:
volumes:
- class: 'data'
id:'a61b96e7-427e-493a-993c-c3efc8a16aa1'
size: '500GB'
type: 'ssd'
template:
src: "volumes.j2"
dest: "../files/volumes.yml"
*Template*:
volumes:
{{ volumes | to_nice_yaml(indent=10) }}
*Result*:
volumes:
- class: data
id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB
type: ssd
*Expected result*:
volumes:
- class: data
id: a61b96e7-427e-493a-993c-c3efc8a16aa1
size: 500GB
type: ssd
What is strange is that the indent value has no effect onthe result.
Am I doing something wrong or is this an issue withansible?
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